diff --git a/src/components/Carousel/Carousel.svelte b/src/components/Carousel/Carousel.svelte
index 19d2dd8..f79874a 100644
--- a/src/components/Carousel/Carousel.svelte
+++ b/src/components/Carousel/Carousel.svelte
@@ -13,12 +13,12 @@
     removeResizeEventListener
   } from '../../utils/event'
   import {
-    getPageSizes,
-    applyPageSizes,
-    getCurrentScrollIndex,
+    getSizes,
+    applyParticleSizes,
+    getCurrentPageIndex,
     getPartialPageSize,
-    getScrollsCount,
-    getPageIndexByScrollIndex,
+    getPagesCount,
+    getParticleIndexByPageIndex,
   } from '../../utils/page'
   import {
     getClones,
@@ -65,7 +65,6 @@
    * Page to start on
    */
   export let initialPageIndex = 0
-  $: initialScrollIndex = initialPageIndex
 
   /**
    * Transition duration (ms)
@@ -112,28 +111,27 @@
   export let swiping = true
 
   /**
-   * Number of pages to show 
+   * Number of particles to show 
    */
   export let pagesToShow = 1
 
   /**
-   * Number of pages to scroll 
+   * Number of particles to scroll 
    */
   export let pagesToScroll = 1
 
   export async function goTo(pageIndex, options) {
-    const scrollIndex = pageIndex
     const animated = get(options, 'animated', true)
-    if (typeof scrollIndex !== 'number') {
+    if (typeof pageIndex !== 'number') {
       throw new Error('pageIndex should be a number')
     }
-    await showPage(getPageIndexByScrollIndex({
+    await showPage(getParticleIndexByPageIndex({
       infinite,
-      scrollIndex,
+      pageIndex,
       clonesCountHead: clonesCount.head,
-      pagesToScroll,
-      pagesCount,
-      pagesToShow,
+      particlesToScroll,
+      particlesCount,
+      particlesToShow,
     }), { animated })
   }
 
@@ -151,35 +149,35 @@
 
   $: clonesCount = getClonesCount({
     infinite,
-    pagesToShow,
+    particlesToShow,
     partialPageSize,
   })
 
-  let currentPageIndex = 0
-  $: currentScrollIndex = getCurrentScrollIndex({
-    currentPageIndex,
-    pagesCount,
+  let currentParticleIndex = 0
+  $: currentPageIndex = getCurrentPageIndex({
+    currentParticleIndex,
+    particlesCount,
     headClonesCount: clonesCount.head,
     infinite,
-    pagesToScroll,
+    particlesToScroll,
   })
-  $: dispatch('pageChange', currentScrollIndex)
+  $: dispatch('pageChange', currentPageIndex)
 
-  let pagesCount = 0
+  let particlesCount = 0
   let pagesCountWithoutClones = 1
-  $: scrollsCount = getScrollsCount({
+  $: pagesCount = getPagesCount({
     infinite,
     pagesCountWithoutClones,
-    pagesToScroll,
+    particlesToScroll,
   })
 
   let partialPageSize = 0
 
-  let pagesWindowWidth = 0
-  let pageWidth = 0
+  let pageWindowWidth = 0
+  let particleWidth = 0
   let offset = 0
   let pageWindowElement
-  let pagesContainer
+  let particlesContainer
   let focused = false
 
   let progressValue
@@ -203,27 +201,27 @@
   // used for lazy loading images, preloaded only current, adjacent and cloanable images
   $: loaded = getAdjacentIndexes({
     infinite,
-    scrollIndex: currentScrollIndex,
-    scrollsCount,
-    pagesCount: pagesCountWithoutClones,
-    pagesToShow,
-    pagesToScroll,
-  }).pageIndexes
+    pageIndex: currentPageIndex,
+    pagesCount,
+    particlesCount: pagesCountWithoutClones,
+    particlesToShow,
+    particlesToScroll,
+  }).particleIndexes
 
   function initPageSizes() {
-    const sizes = getPageSizes({
+    const sizes = getSizes({
       pageWindowElement,
-      pagesContainerChildren: pagesContainer.children,
-      pagesToShow,
+      particlesContainerChildren: particlesContainer.children,
+      particlesToShow,
     })
-    applyPageSizes({
-      pagesContainerChildren: pagesContainer.children,
-      pageWidth: sizes.pageWidth,
+    applyParticleSizes({
+      particlesContainerChildren: particlesContainer.children,
+      particleWidth: sizes.particleWidth,
     })
 
-    pagesWindowWidth = sizes.pagesWindowWidth
-    pageWidth = sizes.pageWidth
-    pagesCount = sizes.pagesCount
+    pageWindowWidth = sizes.pageWindowWidth
+    particleWidth = sizes.particleWidth
+    particlesCount = sizes.particlesCount
 
     offsetPage({
       animated: false,
@@ -237,10 +235,10 @@
     } = getClones({
       headClonesCount: clonesCount.head,
       tailClonesCount: clonesCount.tail,
-      pagesContainerChildren: pagesContainer.children,
+      particlesContainerChildren: particlesContainer.children,
     })
     applyClones({
-      pagesContainer,
+      particlesContainer,
       clonesToAppend,
       clonesToPrepend,
     })
@@ -250,8 +248,8 @@
     // prevent progress change if not infinite for first and last page
     if (
       !infinite && (
-        (autoplayDirection === NEXT && currentPageIndex === pagesCount - 1) || 
-        (autoplayDirection === PREV && currentPageIndex === 0)
+        (autoplayDirection === NEXT && currentParticleIndex === particlesCount - 1) || 
+        (autoplayDirection === PREV && currentParticleIndex === 0)
       )
     ) {
       progressManager.reset()
@@ -269,29 +267,29 @@
     (async () => {
       await tick()
       cleanupFns.push(store.subscribe(value => {
-        currentPageIndex = value.currentPageIndex
+        currentParticleIndex = value.currentParticleIndex
       }))
       cleanupFns.push(() => progressManager.reset())
-      if (pagesContainer && pageWindowElement) {
-        pagesCountWithoutClones = pagesContainer.children.length
+      if (particlesContainer && pageWindowElement) {
+        pagesCountWithoutClones = particlesContainer.children.length
 
         partialPageSize = getPartialPageSize({
-          pagesToScroll,
-          pagesToShow,
+          particlesToScroll,
+          particlesToShow,
           pagesCountWithoutClones,
         })
 
         await tick()
         infinite && addClones()
 
-        // TODO: validate initialScrollIndex
-        store.init(getPageIndexByScrollIndex({
+        // TODO: validate initialPageIndex
+        store.init(getParticleIndexByPageIndex({
           infinite,
-          scrollIndex: initialScrollIndex,
+          pageIndex: initialPageIndex,
           clonesCountHead: clonesCount.head,
-          pagesToScroll,
-          pagesCount,
-          pagesToShow,
+          particlesToScroll,
+          particlesCount,
+          particlesToShow,
         }))
 
         initPageSizes()
@@ -307,13 +305,13 @@
   })
 
   async function handlePageChange(pageIndex) {
-    await showPage(getPageIndexByScrollIndex({
+    await showPage(getParticleIndexByPageIndex({
       infinite,
-      scrollIndex: pageIndex,
+      pageIndex,
       clonesCountHead: clonesCount.head,
-      pagesToScroll,
-      pagesCount,
-      pagesToShow,
+      particlesToScroll,
+      particlesCount,
+      particlesToShow,
     }))
   }
 
@@ -322,7 +320,7 @@
     return new Promise((resolve) => {
       // _duration is an offset animation time
       _duration = animated ? duration : 0
-      offset = -currentPageIndex * pageWidth
+      offset = -currentParticleIndex * particleWidth
       setTimeout(() => {
         resolve()
       }, _duration)
@@ -333,10 +331,10 @@
   async function jumpIfNeeded() {
     let jumped = false
     if (infinite) {
-      if (currentPageIndex === 0) {
-        await showPage(pagesCount - clonesCount.total, { animated: false })
+      if (currentParticleIndex === 0) {
+        await showPage(particlesCount - clonesCount.total, { animated: false })
         jumped = true
-      } else if (currentPageIndex === pagesCount - clonesCount.tail) {
+      } else if (currentParticleIndex === particlesCount - clonesCount.tail) {
         await showPage(clonesCount.head, { animated: false })
         jumped = true
       }
@@ -359,11 +357,11 @@
     !jumped && applyAutoplayIfNeeded(autoplay) // no need to wait it finishes
   }
 
-  async function showPage(pageIndex, options) {
+  async function showPage(particleIndex, options) {
     await changePage(
-      () => store.moveToPage({
-        pageIndex,
-        pagesCount,
+      () => store.moveToParticle({
+        particleIndex,
+        particlesCount,
       }),
       options
     )
@@ -373,8 +371,8 @@
     await changePage(
       () => store.prev({
         infinite,
-        pagesCount,
-        pagesToScroll,
+        particlesCount,
+        particlesToScroll,
       }),
       options,
     )
@@ -384,8 +382,8 @@
     await changePage(
       () => store.next({
         infinite,
-        pagesCount,
-        pagesToScroll,
+        particlesCount,
+        particlesToScroll,
         clonesCountTail: clonesCount.tail,
       }),
       options,
@@ -407,7 +405,7 @@
   }
   function handleSwipeEnd() {
     if (!swiping) return
-    showPage(currentPageIndex)
+    showPage(currentParticleIndex)
   }
   async function handleSwipeFailed() {
     if (!swiping) return
@@ -429,7 +427,7 @@
         <div class="sc-carousel__arrow-container">
           <Arrow
             direction="prev"
-            disabled={!infinite && currentScrollIndex === 0}
+            disabled={!infinite && currentPageIndex === 0}
             on:click={showPrevPage}
           />
         </div>
@@ -447,7 +445,7 @@
     >
       <div
         class="sc-carousel__pages-container"
-        use:swipeable="{{ thresholdProvider: () => pagesWindowWidth/3 }}"
+        use:swipeable="{{ thresholdProvider: () => pageWindowWidth/3 }}"
         on:swipeStart={handleSwipeStart}
         on:swipeMove={handleSwipeMove}
         on:swipeEnd={handleSwipeEnd}
@@ -458,7 +456,7 @@
           transition-duration: {_duration}ms;
           transition-timing-function: {timingFunction};
         "
-        bind:this={pagesContainer}
+        bind:this={particlesContainer}
       >
         <slot {loaded}></slot>
       </div>
@@ -473,7 +471,7 @@
         <div class="sc-carousel__arrow-container">
           <Arrow
             direction="next"
-            disabled={!infinite && currentScrollIndex === scrollsCount - 1}
+            disabled={!infinite && currentPageIndex === pagesCount - 1}
             on:click={showNextPage}
           />
         </div>
@@ -483,13 +481,13 @@
   {#if dots}
     <slot
       name="dots"
-      currentPageIndex={currentScrollIndex}
+      currentPageIndex={currentPageIndex}
       pagesCount={pagesCountWithoutClones}
       showPage={handlePageChange}
     >
       <Dots
-        pagesCount={scrollsCount}
-        currentPageIndex={currentScrollIndex}
+        pagesCount={pagesCount}
+        currentPageIndex={currentPageIndex}
         on:pageChange={event => handlePageChange(event.detail)}
       ></Dots>
     </slot>
diff --git a/src/store.js b/src/store.js
index 58be6b2..892a924 100644
--- a/src/store.js
+++ b/src/store.js
@@ -2,74 +2,73 @@ import {
   writable,
 } from 'svelte/store';
 import {
-  getNextPageIndexFn,
-  getPrevPageIndexFn,
-  getPageIndex,
+  getNextParticleIndexFn,
+  getPrevParticleIndexFn,
 } from './utils/page'
+import {
+  getValueInRange,
+} from './utils/math'
 
 const initState = {
-  currentPageIndex: 0,
+  currentParticleIndex: 0,
 }
 
 function createStore() {
   const { subscribe, set, update } = writable(initState);
 
-  function init(initialPageIndex) {
+  function init(initialParticleIndex) {
     set({
       ...initState,
-      currentPageIndex: initialPageIndex,
+      currentParticleIndex: initialParticleIndex,
     })
   }
 
-  function moveToPage({
-    pageIndex,
-    pagesCount,
+  function moveToParticle({
+    particleIndex,
+    particlesCount,
   }) {
     update(store => {
       return {
         ...store,
-        currentPageIndex: getPageIndex({
-          pageIndex,
-          pagesCount,
-        }),
+        currentParticleIndex: getValueInRange(0, particleIndex, particlesCount - 1),
       }
     })
   }
 
   function next({
     infinite,
-    pagesCount,
-    pagesToScroll,
+    particlesCount,
+    particlesToScroll,
     clonesCountTail,
   }) {
     update(store => {
-      const newCurrentPageIndex = getNextPageIndexFn(infinite)({
-        currentPageIndex: store.currentPageIndex,
-        pagesCount,
-        pagesToScroll,
+      const newCurrentParticleIndex = getNextParticleIndexFn(infinite)({
+        currentParticleIndex: store.currentParticleIndex,
+        particlesCount,
+        particlesToScroll,
         clonesCountTail,
       })
       return {
         ...store,
-        currentPageIndex: newCurrentPageIndex,
+        currentParticleIndex: newCurrentParticleIndex,
       }
     })
   }
 
   function prev({
     infinite,
-    pagesCount,
-    pagesToScroll,
+    particlesCount,
+    particlesToScroll,
   }) {
     update(store => {
-      const newCurrentPageIndex = getPrevPageIndexFn(infinite)({
-        currentPageIndex: store.currentPageIndex,
-        pagesCount,
-        pagesToScroll,
+      const newCurrentParticleIndex = getPrevParticleIndexFn(infinite)({
+        currentParticleIndex: store.currentParticleIndex,
+        particlesCount,
+        particlesToScroll,
       })
       return {
         ...store,
-        currentPageIndex: newCurrentPageIndex,
+        currentParticleIndex: newCurrentParticleIndex,
       }
     })
   }
@@ -79,7 +78,7 @@ function createStore() {
     next,
     prev,
     init,
-    moveToPage,
+    moveToParticle,
   };
 }
 
diff --git a/src/utils/clones.js b/src/utils/clones.js
index 41c4aa7..c79e440 100644
--- a/src/utils/clones.js
+++ b/src/utils/clones.js
@@ -1,18 +1,18 @@
 export function getClones({
   headClonesCount,
   tailClonesCount,
-  pagesContainerChildren,
+  particlesContainerChildren,
 }) {
   // TODO: add fns to remove clones if needed
   const clonesToAppend = []
   for (let i=0; i<tailClonesCount; i++) {
-    clonesToAppend.push(pagesContainerChildren[i].cloneNode(true))
+    clonesToAppend.push(particlesContainerChildren[i].cloneNode(true))
   }
 
   const clonesToPrepend = []
-  const len = pagesContainerChildren.length
+  const len = particlesContainerChildren.length
   for (let i=len-1; i>len-1-headClonesCount; i--) {
-    clonesToPrepend.push(pagesContainerChildren[i].cloneNode(true))
+    clonesToPrepend.push(particlesContainerChildren[i].cloneNode(true))
   }
 
   return {
@@ -22,27 +22,27 @@ export function getClones({
 }
 
 export function applyClones({
-  pagesContainer,
+  particlesContainer,
   clonesToAppend,
   clonesToPrepend,
 }) {
   for (let i=0; i<clonesToAppend.length; i++) {
-    pagesContainer.append(clonesToAppend[i])
+    particlesContainer.append(clonesToAppend[i])
   }
   for (let i=0; i<clonesToPrepend.length; i++) {
-    pagesContainer.prepend(clonesToPrepend[i])
+    particlesContainer.prepend(clonesToPrepend[i])
   }
 }
 
 export function getClonesCount({
   infinite,
-  pagesToShow,
+  particlesToShow,
   partialPageSize,
 }) {
   const clonesCount = infinite
     ? {
-      head: partialPageSize || pagesToShow,
-      tail: pagesToShow,
+      head: partialPageSize || particlesToShow,
+      tail: particlesToShow,
     } : {
       head: 0,
       tail: 0,
diff --git a/src/utils/lazy.js b/src/utils/lazy.js
index 891f08e..f5c2696 100644
--- a/src/utils/lazy.js
+++ b/src/utils/lazy.js
@@ -1,16 +1,16 @@
 import { getValueInRange } from './math'
 
 export function getIndexesOfPagesWithoutClonesInScroll({
-  scrollIndex,
-  pagesToShow,
-  pagesToScroll,
-  pagesCount,
+  pageIndex,
+  particlesToShow,
+  particlesToScroll,
+  particlesCount,
 }) {
-  const overlap = scrollIndex === 0 ? 0 : pagesToShow - pagesToScroll
-  const from = scrollIndex * pagesToShow - scrollIndex * overlap
-  const to = from + Math.max(pagesToShow, pagesToScroll) - 1
+  const overlap = pageIndex === 0 ? 0 : particlesToShow - particlesToScroll
+  const from = pageIndex * particlesToShow - pageIndex * overlap
+  const to = from + Math.max(particlesToShow, particlesToScroll) - 1
   const indexes = []
-  for (let i=from; i<=Math.min(pagesCount - 1, to); i++) {
+  for (let i=from; i<=Math.min(particlesCount - 1, to); i++) {
     indexes.push(i)
   }
   return indexes
@@ -18,44 +18,44 @@ export function getIndexesOfPagesWithoutClonesInScroll({
 
 export function getAdjacentIndexes({
   infinite,
-  scrollIndex,
-  scrollsCount,
+  pageIndex,
   pagesCount,
-  pagesToShow,
-  pagesToScroll,
+  particlesCount,
+  particlesToShow,
+  particlesToScroll,
 }) {
-  const _scrollIndex = getValueInRange(0, scrollIndex, scrollsCount - 1)
+  const _pageIndex = getValueInRange(0, pageIndex, pagesCount - 1)
 
-  let rangeStart = _scrollIndex - 1
-  let rangeEnd = _scrollIndex + 1
+  let rangeStart = _pageIndex - 1
+  let rangeEnd = _pageIndex + 1
 
   rangeStart = infinite
-    ? rangeStart < 0 ? scrollsCount - 1 : rangeStart
+    ? rangeStart < 0 ? pagesCount - 1 : rangeStart
     : Math.max(0, rangeStart)
 
   rangeEnd = infinite
-    ? rangeEnd > scrollsCount - 1 ? 0 : rangeEnd
-    : Math.min(scrollsCount - 1, rangeEnd)
+    ? rangeEnd > pagesCount - 1 ? 0 : rangeEnd
+    : Math.min(pagesCount - 1, rangeEnd)
 
-  const scrollIndexes = [...new Set([
+  const pageIndexes = [...new Set([
     rangeStart,
-    _scrollIndex,
+    _pageIndex,
     rangeEnd,
 
     // because of these values outputs for infinite/non-infinites are the same
-    0, // needed to clone first scroll pages
-    scrollsCount - 1, // needed to clone last scroll pages
+    0, // needed to clone first page particles
+    pagesCount - 1, // needed to clone last page particles
   ])].sort((a, b) => a - b)
-  const pageIndexes = scrollIndexes.flatMap(
-    scrollIndex => getIndexesOfPagesWithoutClonesInScroll({
-      scrollIndex,
-      pagesToShow,
-      pagesToScroll,
-      pagesCount,
+  const particleIndexes = pageIndexes.flatMap(
+    pageIndex => getIndexesOfPagesWithoutClonesInScroll({
+      pageIndex,
+      particlesToShow,
+      particlesToScroll,
+      particlesCount,
     })
   )
   return {
-    scrollIndexes,
-    pageIndexes: [...new Set(pageIndexes)].sort((a, b) => a - b),
+    pageIndexes,
+    particleIndexes: [...new Set(particleIndexes)].sort((a, b) => a - b),
   }
 }
diff --git a/src/utils/lazy.test.js b/src/utils/lazy.test.js
index 135ae5e..96bea24 100644
--- a/src/utils/lazy.test.js
+++ b/src/utils/lazy.test.js
@@ -4,68 +4,68 @@ import {
 } from './lazy.js'
 
 describe('getIndexesOfPagesWithoutClonesInScroll', () => {
-  it('returns correct range if pagesToShow < pagesToScroll', () => {
+  it('returns correct range if particlesToShow < particlesToScroll', () => {
     const testCases = [
-      { scrollIndex: 0, pagesToShow: 3, pagesCount: 9, pagesToScroll: 4, expected: [0, 1, 2, 3] },
-      { scrollIndex: 1, pagesToShow: 3, pagesCount: 9, pagesToScroll: 4, expected: [4, 5, 6, 7] },
-      { scrollIndex: 2, pagesToShow: 3, pagesCount: 9, pagesToScroll: 4, expected: [8] },
+      { pageIndex: 0, particlesToShow: 3, particlesCount: 9, particlesToScroll: 4, expected: [0, 1, 2, 3] },
+      { pageIndex: 1, particlesToShow: 3, particlesCount: 9, particlesToScroll: 4, expected: [4, 5, 6, 7] },
+      { pageIndex: 2, particlesToShow: 3, particlesCount: 9, particlesToScroll: 4, expected: [8] },
     ]
     testCases.forEach(({
-      scrollIndex,
-      pagesToShow,
-      pagesToScroll,
-      pagesCount,
+      pageIndex,
+      particlesToShow,
+      particlesToScroll,
+      particlesCount,
       expected,
     }) => {
       expect(getIndexesOfPagesWithoutClonesInScroll({
-        scrollIndex,
-        pagesToShow,
-        pagesToScroll,
-        pagesCount,
+        pageIndex,
+        particlesToShow,
+        particlesToScroll,
+        particlesCount,
       })).toEqual(expected)
     })
   })
 
-  it('returns correct range if pagesToShow > pagesToScroll', () => {
+  it('returns correct range if particlesToShow > particlesToScroll', () => {
     const testCases = [
-      { scrollIndex: 0, pagesToShow: 4, pagesToScroll: 3, pagesCount: 8, expected: [0, 1, 2, 3] },
-      { scrollIndex: 1, pagesToShow: 4, pagesToScroll: 3, pagesCount: 8, expected: [3, 4, 5, 6] },
-      { scrollIndex: 2, pagesToShow: 4, pagesToScroll: 3, pagesCount: 8, expected: [6, 7] },
+      { pageIndex: 0, particlesToShow: 4, particlesToScroll: 3, particlesCount: 8, expected: [0, 1, 2, 3] },
+      { pageIndex: 1, particlesToShow: 4, particlesToScroll: 3, particlesCount: 8, expected: [3, 4, 5, 6] },
+      { pageIndex: 2, particlesToShow: 4, particlesToScroll: 3, particlesCount: 8, expected: [6, 7] },
     ]
     testCases.forEach(({
-      scrollIndex,
-      pagesToShow,
-      pagesToScroll,
-      pagesCount,
+      pageIndex,
+      particlesToShow,
+      particlesToScroll,
+      particlesCount,
       expected,
     }) => {
       expect(getIndexesOfPagesWithoutClonesInScroll({
-        scrollIndex,
-        pagesToShow,
-        pagesToScroll,
-        pagesCount,
+        pageIndex,
+        particlesToShow,
+        particlesToScroll,
+        particlesCount,
       })).toEqual(expected)
     })
   })
 
-  it('returns correct range if pagesToShow == pagesToScroll', () => {
+  it('returns correct range if particlesToShow == particlesToScroll', () => {
     const testCases = [
-      { scrollIndex: 0, pagesToShow: 2, pagesToScroll: 2, pagesCount: 5, expected: [0, 1] },
-      { scrollIndex: 1, pagesToShow: 2, pagesToScroll: 2, pagesCount: 5, expected: [2, 3] },
-      { scrollIndex: 2, pagesToShow: 2, pagesToScroll: 2, pagesCount: 5, expected: [4] },
+      { pageIndex: 0, particlesToShow: 2, particlesToScroll: 2, particlesCount: 5, expected: [0, 1] },
+      { pageIndex: 1, particlesToShow: 2, particlesToScroll: 2, particlesCount: 5, expected: [2, 3] },
+      { pageIndex: 2, particlesToShow: 2, particlesToScroll: 2, particlesCount: 5, expected: [4] },
     ]
     testCases.forEach(({
-      scrollIndex,
-      pagesToShow,
-      pagesToScroll,
-      pagesCount,
+      pageIndex,
+      particlesToShow,
+      particlesToScroll,
+      particlesCount,
       expected,
     }) => {
       expect(getIndexesOfPagesWithoutClonesInScroll({
-        scrollIndex,
-        pagesToShow,
-        pagesToScroll,
-        pagesCount,
+        pageIndex,
+        particlesToShow,
+        particlesToScroll,
+        particlesCount,
       })).toEqual(expected)
     })
   })
@@ -75,87 +75,87 @@ describe('getAdjacentIndexes', () => {
   it('returns indexes as expected if it is infinite', () => {
     const testCases = [
       {
-        scrollIndex: 0,
-        scrollsCount: 2,
-        pagesCount: 4,
-        pagesToShow: 2,
-        pagesToScroll: 2,
+        pageIndex: 0,
+        pagesCount: 2,
+        particlesCount: 4,
+        particlesToShow: 2,
+        particlesToScroll: 2,
         expected: {
-          scrollIndexes: [0, 1],
-          pageIndexes: [0, 1, 2, 3],
+          pageIndexes: [0, 1],
+          particleIndexes: [0, 1, 2, 3],
         },
       },
       {
-        scrollIndex: -5,
-        scrollsCount: 5,
-        pagesCount: 10,
-        pagesToShow: 2,
-        pagesToScroll: 2,
+        pageIndex: -5,
+        pagesCount: 5,
+        particlesCount: 10,
+        particlesToShow: 2,
+        particlesToScroll: 2,
         expected: {
-          scrollIndexes: [0, 1, 4],
-          pageIndexes: [0, 1, 2, 3, 8, 9],
+          pageIndexes: [0, 1, 4],
+          particleIndexes: [0, 1, 2, 3, 8, 9],
         },
       },
       {
-        scrollIndex: 0,
-        scrollsCount: 5,
-        pagesCount: 10,
-        pagesToShow: 2,
-        pagesToScroll: 2,
+        pageIndex: 0,
+        pagesCount: 5,
+        particlesCount: 10,
+        particlesToShow: 2,
+        particlesToScroll: 2,
         expected: {
-          scrollIndexes:  [0, 1, 4],
-          pageIndexes: [0, 1, 2, 3, 8, 9],
+          pageIndexes:  [0, 1, 4],
+          particleIndexes: [0, 1, 2, 3, 8, 9],
         },
       },
       {
-        scrollIndex: 2,
-        scrollsCount: 5,
-        pagesCount: 10,
-        pagesToShow: 2,
-        pagesToScroll: 2,
+        pageIndex: 2,
+        pagesCount: 5,
+        particlesCount: 10,
+        particlesToShow: 2,
+        particlesToScroll: 2,
         expected: {
-          scrollIndexes: [0, 1, 2, 3, 4],
-          pageIndexes: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
+          pageIndexes: [0, 1, 2, 3, 4],
+          particleIndexes: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
         },
       },
       {
-        scrollIndex: 4,
-        scrollsCount: 5,
-        pagesCount: 10,
-        pagesToShow: 2,
-        pagesToScroll: 2,
+        pageIndex: 4,
+        pagesCount: 5,
+        particlesCount: 10,
+        particlesToShow: 2,
+        particlesToScroll: 2,
         expected: {
-          scrollIndexes: [0, 3, 4],
-          pageIndexes: [0, 1, 6, 7, 8, 9],
+          pageIndexes: [0, 3, 4],
+          particleIndexes: [0, 1, 6, 7, 8, 9],
         },
       },
       {
-        scrollIndex: 15,
-        scrollsCount: 5,
-        pagesCount: 10,
-        pagesToShow: 2,
-        pagesToScroll: 2,
+        pageIndex: 15,
+        pagesCount: 5,
+        particlesCount: 10,
+        particlesToShow: 2,
+        particlesToScroll: 2,
         expected: {
-          scrollIndexes: [0, 3, 4],
-          pageIndexes: [0, 1, 6, 7, 8, 9],
+          pageIndexes: [0, 3, 4],
+          particleIndexes: [0, 1, 6, 7, 8, 9],
         },
       },
     ]
     testCases.forEach(({
-      scrollIndex,
-      scrollsCount,
+      pageIndex,
       pagesCount,
-      pagesToShow,
-      pagesToScroll,
+      particlesCount,
+      particlesToShow,
+      particlesToScroll,
       expected,
     }) => {
       expect(getAdjacentIndexes({
         infinite: true,
-        scrollIndex,
-        scrollsCount,
+        pageIndex,
         pagesCount,
-        pagesToShow,
-        pagesToScroll,
+        particlesCount,
+        particlesToShow,
+        particlesToScroll,
       })).toEqual(expected)
     })
   })
@@ -163,87 +163,87 @@ describe('getAdjacentIndexes', () => {
   it('returns indexes as expected if it is not infinite', () => {
     const testCases = [
       {
-        scrollIndex: 0,
-        scrollsCount: 2,
-        pagesCount: 4,
-        pagesToShow: 2,
-        pagesToScroll: 2,
+        pageIndex: 0,
+        pagesCount: 2,
+        particlesCount: 4,
+        particlesToShow: 2,
+        particlesToScroll: 2,
         expected: {
-          scrollIndexes: [0, 1],
-          pageIndexes: [0, 1, 2, 3],
+          pageIndexes: [0, 1],
+          particleIndexes: [0, 1, 2, 3],
         },
       },
       {
-        scrollIndex: -5,
-        scrollsCount: 5,
-        pagesCount: 10,
-        pagesToShow: 2,
-        pagesToScroll: 2,
+        pageIndex: -5,
+        pagesCount: 5,
+        particlesCount: 10,
+        particlesToShow: 2,
+        particlesToScroll: 2,
         expected: {
-          scrollIndexes: [0, 1, 4],
-          pageIndexes: [0, 1, 2, 3, 8, 9],
+          pageIndexes: [0, 1, 4],
+          particleIndexes: [0, 1, 2, 3, 8, 9],
         },
       },
       {
-        scrollIndex: 0,
-        scrollsCount: 5,
-        pagesCount: 10,
-        pagesToShow: 2,
-        pagesToScroll: 2,
+        pageIndex: 0,
+        pagesCount: 5,
+        particlesCount: 10,
+        particlesToShow: 2,
+        particlesToScroll: 2,
         expected: {
-          scrollIndexes:  [0, 1, 4],
-          pageIndexes: [0, 1, 2, 3, 8, 9],
+          pageIndexes:  [0, 1, 4],
+          particleIndexes: [0, 1, 2, 3, 8, 9],
         },
       },
       {
-        scrollIndex: 2,
-        scrollsCount: 5,
-        pagesCount: 10,
-        pagesToShow: 2,
-        pagesToScroll: 2,
+        pageIndex: 2,
+        pagesCount: 5,
+        particlesCount: 10,
+        particlesToShow: 2,
+        particlesToScroll: 2,
         expected: {
-          scrollIndexes: [0, 1, 2, 3, 4],
-          pageIndexes: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
+          pageIndexes: [0, 1, 2, 3, 4],
+          particleIndexes: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
         },
       },
       {
-        scrollIndex: 4,
-        scrollsCount: 5,
-        pagesCount: 10,
-        pagesToShow: 2,
-        pagesToScroll: 2,
+        pageIndex: 4,
+        pagesCount: 5,
+        particlesCount: 10,
+        particlesToShow: 2,
+        particlesToScroll: 2,
         expected: {
-          scrollIndexes: [0, 3, 4],
-          pageIndexes: [0, 1, 6, 7, 8, 9],
+          pageIndexes: [0, 3, 4],
+          particleIndexes: [0, 1, 6, 7, 8, 9],
         },
       },
       {
-        scrollIndex: 15,
-        scrollsCount: 5,
-        pagesCount: 10,
-        pagesToShow: 2,
-        pagesToScroll: 2,
+        pageIndex: 15,
+        pagesCount: 5,
+        particlesCount: 10,
+        particlesToShow: 2,
+        particlesToScroll: 2,
         expected: {
-          scrollIndexes: [0, 3, 4],
-          pageIndexes: [0, 1, 6, 7, 8, 9],
+          pageIndexes: [0, 3, 4],
+          particleIndexes: [0, 1, 6, 7, 8, 9],
         },
       },
     ]
     testCases.forEach(({
-      scrollIndex,
-      scrollsCount,
+      pageIndex,
       pagesCount,
-      pagesToShow,
-      pagesToScroll,
+      particlesCount,
+      particlesToShow,
+      particlesToScroll,
       expected,
     }) => {
       expect(getAdjacentIndexes({
         infinite: false,
-        scrollIndex,
-        scrollsCount,
+        pageIndex,
         pagesCount,
-        pagesToShow,
-        pagesToScroll,
+        particlesCount,
+        particlesToShow,
+        particlesToScroll,
       })).toEqual(expected)
     })
   })
diff --git a/src/utils/math.js b/src/utils/math.js
index da12869..ffc08cd 100644
--- a/src/utils/math.js
+++ b/src/utils/math.js
@@ -6,6 +6,5 @@ export const getDistance = (p1, p2) => {
 }
 
 export function getValueInRange(min, value, max) {
-  // if (min > max) throw new Error(`min (${min}) should be more than or equal to max (${max})`)
   return Math.max(min, Math.min(value, max))
 }
\ No newline at end of file
diff --git a/src/utils/math.test.js b/src/utils/math.test.js
index 1307b7c..6cb758a 100644
--- a/src/utils/math.test.js
+++ b/src/utils/math.test.js
@@ -1,5 +1,6 @@
 import {
   getDistance,
+  getValueInRange,
 } from './math.js'
 
 describe('getDistance', () => {
@@ -17,3 +18,28 @@ describe('getDistance', () => {
     expect(getDistance(p1, p2)).toBe(5)
   })
 })
+
+describe('getValueInRange', () => {
+  it('returns value in range as expected', () => {
+    const testCases = [
+      { min: 0, value: -5, max: 3, expected: 0 },
+      { min: 0, value: 0, max: 3, expected: 0 },
+      { min: 0, value: 1, max: 3, expected: 1 },
+      { min: 0, value: 2, max: 3, expected: 2 },
+      { min: 0, value: 7, max: 3, expected: 3 },
+    ]
+    testCases.forEach(({
+      min,
+      value,
+      max,
+      expected,
+    }) => {
+      expect(getValueInRange(
+        min,
+        value,
+        max,
+      )).toBe(expected)
+    })
+  })
+})
+
diff --git a/src/utils/page.js b/src/utils/page.js
index 17a5ad9..ccd9abb 100644
--- a/src/utils/page.js
+++ b/src/utils/page.js
@@ -2,143 +2,135 @@ import {
   getValueInRange,
 } from './math'
 
-export function getNextPageIndexLimited({
-  currentPageIndex,
-  pagesCount,
-  pagesToScroll,
+export function getNextParticleIndexLimited({
+  currentParticleIndex,
+  particlesCount,
+  particlesToScroll,
 }) {
-  if (pagesCount < 1) throw new Error('pagesCount must be at least 1')
-  return currentPageIndex + Math.min(pagesCount - (currentPageIndex + 1) - pagesToScroll, pagesToScroll)
+  if (particlesCount < 1) throw new Error('particlesCount must be at least 1')
+  return currentParticleIndex + Math.min(particlesCount - (currentParticleIndex + 1) - particlesToScroll, particlesToScroll)
 }
 
-export function getNextPageIndexInfinte({
-  currentPageIndex,
-  pagesCount,
-  pagesToScroll,
+export function getNextParticleIndexInfinte({
+  currentParticleIndex,
+  particlesCount,
+  particlesToScroll,
   clonesCountTail,
 }) {
-  if (pagesCount < 1) throw new Error('pagesCount must be at least 1')
-  const newCurrentPageIndex = Math.max(currentPageIndex, 0) + Math.min(pagesCount - clonesCountTail - currentPageIndex, pagesToScroll)
-  return newCurrentPageIndex > pagesCount - 1 ? 0 : Math.max(newCurrentPageIndex, 0)
+  if (particlesCount < 1) throw new Error('particlesCount must be at least 1')
+  const newCurrentParticleIndex = Math.max(currentParticleIndex, 0) + Math.min(particlesCount - clonesCountTail - currentParticleIndex, particlesToScroll)
+  return newCurrentParticleIndex > particlesCount - 1 ? 0 : Math.max(newCurrentParticleIndex, 0)
 }
 
-export function getNextPageIndexFn(infinite) {
-  return infinite ? getNextPageIndexInfinte : getNextPageIndexLimited
+export function getNextParticleIndexFn(infinite) {
+  return infinite ? getNextParticleIndexInfinte : getNextParticleIndexLimited
 }
 
-export function getPrevPageIndexLimited({
-  currentPageIndex,
-  pagesCount,
-  pagesToScroll,
+export function getPrevParticleIndexLimited({
+  currentParticleIndex,
+  particlesCount,
+  particlesToScroll,
 }) {
-  if (pagesCount < 1) throw new Error('pagesCount must be at least 1')
+  if (particlesCount < 1) throw new Error('particlesCount must be at least 1')
   return getValueInRange(
     0,
-    currentPageIndex - Math.min(currentPageIndex, pagesToScroll),
-    pagesCount - 1
+    currentParticleIndex - Math.min(currentParticleIndex, particlesToScroll),
+    particlesCount - 1
   )
 }
 
-export function getPrevPageIndexInfinte({
-  currentPageIndex,
-  pagesCount,
-  pagesToScroll,
+export function getPrevParticleIndexInfinte({
+  currentParticleIndex,
+  particlesCount,
+  particlesToScroll,
 }) {
-  if (pagesCount < 1) throw new Error('pagesCount must be at least 1')
-  const newCurrentPageIndex = Math.min(currentPageIndex, pagesCount - 1) - Math.min(currentPageIndex, pagesToScroll)
-  return newCurrentPageIndex >= 0 ? Math.min(newCurrentPageIndex, pagesCount - 1) : pagesCount - 1
+  if (particlesCount < 1) throw new Error('particlesCount must be at least 1')
+  const newCurrentParticleIndex = Math.min(currentParticleIndex, particlesCount - 1) - Math.min(currentParticleIndex, particlesToScroll)
+  return newCurrentParticleIndex >= 0 ? Math.min(newCurrentParticleIndex, particlesCount - 1) : particlesCount - 1
 }
 
-export function getPrevPageIndexFn(infinite) {
-  return infinite ? getPrevPageIndexInfinte : getPrevPageIndexLimited
+export function getPrevParticleIndexFn(infinite) {
+  return infinite ? getPrevParticleIndexInfinte : getPrevParticleIndexLimited
 }
 
-export function getPageIndex({
-  pageIndex,
-  pagesCount,
-}) {
-  if (pagesCount < 1) throw new Error('pagesCount must be at least 1')
-  return pageIndex < 0 ? 0 : Math.min(pageIndex, pagesCount - 1)
-}
-
-export function getPageSizes({
+export function getSizes({
   pageWindowElement,
-  pagesContainerChildren,
-  pagesToShow,
+  particlesContainerChildren,
+  particlesToShow,
 }) {
-  const pagesWindowWidth = pageWindowElement.clientWidth
-  const pageWidth = pagesWindowWidth / pagesToShow
-  const pagesCount = pagesContainerChildren.length
+  const pageWindowWidth = pageWindowElement.clientWidth
+  const particleWidth = pageWindowWidth / particlesToShow
+  const particlesCount = particlesContainerChildren.length
 
   return {
-    pagesWindowWidth,
-    pageWidth,
-    pagesCount,
+    pageWindowWidth,
+    particleWidth,
+    particlesCount,
   }
 }
 
-export function applyPageSizes({
-  pagesContainerChildren,
-  pageWidth,
+export function applyParticleSizes({
+  particlesContainerChildren,
+  particleWidth,
 }) {
-  for (let pageIndex=0; pageIndex<pagesContainerChildren.length; pageIndex++) {
-    pagesContainerChildren[pageIndex].style.minWidth = `${pageWidth}px`
-    pagesContainerChildren[pageIndex].style.maxWidth = `${pageWidth}px`
+  for (let particleIndex=0; particleIndex<particlesContainerChildren.length; particleIndex++) {
+    particlesContainerChildren[particleIndex].style.minWidth = `${particleWidth}px`
+    particlesContainerChildren[particleIndex].style.maxWidth = `${particleWidth}px`
   }
 }
 
-export function getCurrentScrollIndex({
-  currentPageIndex,
-  pagesCount,
+export function getCurrentPageIndex({
+  currentParticleIndex,
+  particlesCount,
   headClonesCount,
   infinite,
-  pagesToScroll,
+  particlesToScroll,
 }) {
   if (infinite) {
-    if (currentPageIndex === pagesCount - headClonesCount) return 0
-    if (currentPageIndex === 0) return pagesCount - headClonesCount
-    return Math.floor((currentPageIndex - headClonesCount) / pagesToScroll)
+    if (currentParticleIndex === particlesCount - headClonesCount) return 0
+    if (currentParticleIndex === 0) return particlesCount - headClonesCount
+    return Math.floor((currentParticleIndex - headClonesCount) / particlesToScroll)
   }
-  return Math.ceil(currentPageIndex / pagesToScroll)
+  return Math.ceil(currentParticleIndex / particlesToScroll)
 }
 
-// TODO: think about case if pagesCount < pagesToShow and pagesCount < pagesToScroll
+// TODO: think about case if particlesCount < particlesToShow and particlesCount < particlesToScroll
 export function getPartialPageSize({
-  pagesToScroll,
-  pagesToShow,
-  pagesCountWithoutClones
+  particlesToScroll,
+  particlesToShow,
+  pagesCountWithoutClones, // TODO: rename 
 }) {
-  const overlap = pagesToScroll - pagesToShow
-  let _pages = pagesToShow
+  const overlap = particlesToScroll - particlesToShow
+  let particlesCount = particlesToShow
 
   while(true) {
-    const diff = pagesCountWithoutClones - _pages - overlap
-    if (diff < pagesToShow) {
+    const diff = pagesCountWithoutClones - particlesCount - overlap
+    if (diff < particlesToShow) {
       return diff
     }
-    _pages += pagesToShow + overlap
+    particlesCount += particlesToShow + overlap
   }
 }
 
-export function getScrollsCount({
+export function getPagesCount({
   infinite,
   pagesCountWithoutClones,
-  pagesToScroll,
+  particlesToScroll,
 }) {
   return infinite
-    ? Math.ceil(pagesCountWithoutClones / pagesToScroll)
-    : Math.round(pagesCountWithoutClones / pagesToScroll)
+    ? Math.ceil(pagesCountWithoutClones / particlesToScroll)
+    : Math.round(pagesCountWithoutClones / particlesToScroll)
 }
 
-export function getPageIndexByScrollIndex({
+export function getParticleIndexByPageIndex({
   infinite,
-  scrollIndex,
+  pageIndex,
   clonesCountHead,
-  pagesToScroll,
-  pagesCount,
-  pagesToShow,
+  particlesToScroll,
+  particlesCount,
+  particlesToShow,
 }) {
   return infinite
-    ? clonesCountHead + scrollIndex * pagesToScroll
-    : Math.min(scrollIndex * pagesToScroll, pagesCount - pagesToShow)
+    ? clonesCountHead + pageIndex * particlesToScroll
+    : Math.min(pageIndex * particlesToScroll, particlesCount - particlesToShow)
 }
diff --git a/src/utils/page.test.js b/src/utils/page.test.js
index 7481b98..88c33b0 100644
--- a/src/utils/page.test.js
+++ b/src/utils/page.test.js
@@ -1,274 +1,250 @@
 import {
-  getNextPageIndexLimited,
-  getNextPageIndexInfinte,
-  getPrevPageIndexLimited,
-  getPrevPageIndexInfinte,
-  getPageIndex,
+  getNextParticleIndexLimited,
+  getNextParticleIndexInfinte,
+  getPrevParticleIndexLimited,
+  getPrevParticleIndexInfinte,
   getAdjacentIndexes,
+  getPartialPageSize,
 } from './page.js'
 
-// describe('getNextPageIndexLimited', () => {
+// describe('getNextParticleIndexLimited', () => {
 //   it('returns next page index as expected', () => {
 //     const testCases = [
-//       { currentPageIndex: -5, pagesCount: 3, expected: 0 },
-//       { currentPageIndex: 0, pagesCount: 3, expected: 1 },
-//       { currentPageIndex: 1, pagesCount: 3, expected: 2 },
-//       { currentPageIndex: 2, pagesCount: 3, expected: 2 },
-//       { currentPageIndex: 7, pagesCount: 3, expected: 2 },
+//       { currentParticleIndex: -5, particlesCount: 3, particlesToScroll: 1, expected: 0 },
+//       { currentParticleIndex: 0, particlesCount: 3, particlesToScroll: 1, expected: 1 },
+//       { currentParticleIndex: 1, particlesCount: 3, particlesToScroll: 1, expected: 2 },
+//       { currentParticleIndex: 2, particlesCount: 3, particlesToScroll: 1, expected: 2 },
+//       { currentParticleIndex: 7, particlesCount: 3, particlesToScroll: 1, expected: 2 },
 //     ]
 //     testCases.forEach(({
-//       currentPageIndex,
-//       pagesCount,
+//       currentParticleIndex,
+//       particlesCount,
+//       particlesToScroll,
 //       expected,
 //     }) => {
-//       expect(getNextPageIndexLimited({
-//         currentPageIndex,
-//         pagesCount,
+//       expect(getNextParticleIndexLimited({
+//         currentParticleIndex,
+//         particlesCount,
+//         particlesToScroll,
 //       })).toBe(expected)
 //     })
 //   })
-//   it('throws error if pagesCount is less than 1', () => {
-//     const currentPageIndex = 5
-//     const pagesCount = 0
+//   it('throws error if particlesCount is less than 1', () => {
+//     const currentParticleIndex = 5
+//     const particlesCount = 0
+//     const particlesToScroll = 1
 //     expect(
-//       () => getNextPageIndexLimited({
-//         currentPageIndex,
-//         pagesCount,
+//       () => getNextParticleIndexLimited({
+//         currentParticleIndex,
+//         particlesCount,
+//         particlesToScroll,
 //       })
-//     ).toThrowError('pagesCount must be at least 1')
+//     ).toThrowError('particlesCount must be at least 1')
 //   })
 // })
 
-// describe('getNextPageIndexInfinte', () => {
+// describe('getNextParticleIndexInfinte', () => {
 //   it('returns next page index as expected', () => {
 //     const testCases = [
-//       { currentPageIndex: -5, pagesCount: 3, expected: 1 },
-//       { currentPageIndex: 0, pagesCount: 3, expected: 1 },
-//       { currentPageIndex: 1, pagesCount: 3, expected: 2 },
-//       { currentPageIndex: 2, pagesCount: 3, expected: 0 },
-//       { currentPageIndex: 7, pagesCount: 3, expected: 0 },
+//       { currentParticleIndex: -5, particlesCount: 3, expected: 1 },
+//       { currentParticleIndex: 0, particlesCount: 3, expected: 1 },
+//       { currentParticleIndex: 1, particlesCount: 3, expected: 2 },
+//       { currentParticleIndex: 2, particlesCount: 3, expected: 0 },
+//       { currentParticleIndex: 7, particlesCount: 3, expected: 0 },
 //     ]
 //     testCases.forEach(({
-//       currentPageIndex,
-//       pagesCount,
+//       currentParticleIndex,
+//       particlesCount,
 //       expected,
 //     }) => {
-//       expect(getNextPageIndexInfinte({
-//         currentPageIndex,
-//         pagesCount,
+//       expect(getNextParticleIndexInfinte({
+//         currentParticleIndex,
+//         particlesCount,
 //       })).toBe(expected)
 //     })
 //   })
-//   it('throws error if pagesCount is less than 1', () => {
-//     const currentPageIndex = 5
-//     const pagesCount = 0
+//   it('throws error if particlesCount is less than 1', () => {
+//     const currentParticleIndex = 5
+//     const particlesCount = 0
 //     expect(
-//       () => getNextPageIndexInfinte({
-//         currentPageIndex,
-//         pagesCount,
+//       () => getNextParticleIndexInfinte({
+//         currentParticleIndex,
+//         particlesCount,
 //       })
-//     ).toThrowError('pagesCount must be at least 1')
+//     ).toThrowError('particlesCount must be at least 1')
 //   })
 // })
 
-// describe('getPrevPageIndexLimited', () => {
+// describe('getPrevParticleIndexLimited', () => {
 //   it('returns prev page index as expected', () => {
 //     const testCases = [
-//       { currentPageIndex: -5, pagesCount: 3, expected: 0 },
-//       { currentPageIndex: 0, pagesCount: 3, expected: 0 },
-//       { currentPageIndex: 1, pagesCount: 3, expected: 0 },
-//       { currentPageIndex: 2, pagesCount: 3, expected: 1 },
-//       { currentPageIndex: 7, pagesCount: 3, expected: 2 },
+//       { currentParticleIndex: -5, particlesCount: 3, expected: 0 },
+//       { currentParticleIndex: 0, particlesCount: 3, expected: 0 },
+//       { currentParticleIndex: 1, particlesCount: 3, expected: 0 },
+//       { currentParticleIndex: 2, particlesCount: 3, expected: 1 },
+//       { currentParticleIndex: 7, particlesCount: 3, expected: 2 },
 //     ]
 //     testCases.forEach(({
-//       currentPageIndex,
-//       pagesCount,
+//       currentParticleIndex,
+//       particlesCount,
 //       expected,
 //     }) => {
-//       expect(getPrevPageIndexLimited({
-//         currentPageIndex,
-//         pagesCount,
+//       expect(getPrevParticleIndexLimited({
+//         currentParticleIndex,
+//         particlesCount,
 //       })).toBe(expected)
 //     })
 //   })
-//   it('throws error if pagesCount is less than 1', () => {
-//     const currentPageIndex = 5
-//     const pagesCount = 0
+//   it('throws error if particlesCount is less than 1', () => {
+//     const currentParticleIndex = 5
+//     const particlesCount = 0
 //     expect(
-//       () => getPrevPageIndexLimited({
-//         currentPageIndex,
-//         pagesCount,
+//       () => getPrevParticleIndexLimited({
+//         currentParticleIndex,
+//         particlesCount,
 //       })
-//     ).toThrowError('pagesCount must be at least 1')
+//     ).toThrowError('particlesCount must be at least 1')
 //   })
 // })
 
-// describe('getPrevPageIndexInfinte', () => {
+// describe('getPrevParticleIndexInfinte', () => {
 //   it('returns prev page index as expected', () => {
 //     const testCases = [
-//       { currentPageIndex: -5, pagesCount: 3, expected: 2 },
-//       { currentPageIndex: 0, pagesCount: 3, expected: 2 },
-//       { currentPageIndex: 1, pagesCount: 3, expected: 0 },
-//       { currentPageIndex: 2, pagesCount: 3, expected: 1 },
-//       { currentPageIndex: 7, pagesCount: 3, expected: 1 },
+//       { currentParticleIndex: -5, particlesCount: 3, expected: 2 },
+//       { currentParticleIndex: 0, particlesCount: 3, expected: 2 },
+//       { currentParticleIndex: 1, particlesCount: 3, expected: 0 },
+//       { currentParticleIndex: 2, particlesCount: 3, expected: 1 },
+//       { currentParticleIndex: 7, particlesCount: 3, expected: 1 },
 //     ]
 //     testCases.forEach(({
-//       currentPageIndex,
-//       pagesCount,
+//       currentParticleIndex,
+//       particlesCount,
 //       expected,
 //     }) => {
-//       expect(getPrevPageIndexInfinte({
-//         currentPageIndex,
-//         pagesCount,
+//       expect(getPrevParticleIndexInfinte({
+//         currentParticleIndex,
+//         particlesCount,
 //       })).toBe(expected)
 //     })
 //   })
-//   it('throws error if pagesCount is less than 1', () => {
-//     const currentPageIndex = 5
-//     const pagesCount = 0
+//   it('throws error if particlesCount is less than 1', () => {
+//     const currentParticleIndex = 5
+//     const particlesCount = 0
 //     expect(
-//       () => getPrevPageIndexInfinte({
-//         currentPageIndex,
-//         pagesCount,
+//       () => getPrevParticleIndexInfinte({
+//         currentParticleIndex,
+//         particlesCount,
 //       })
-//     ).toThrowError('pagesCount must be at least 1')
+//     ).toThrowError('particlesCount must be at least 1')
 //   })
 // })
 
-// describe('getPageIndex', () => {
-//   it('returns normalized page index as expected', () => {
-//     const testCases = [
-//       { pageIndex: -5, pagesCount: 3, expected: 0 },
-//       { pageIndex: 0, pagesCount: 3, expected: 0 },
-//       { pageIndex: 1, pagesCount: 3, expected: 1 },
-//       { pageIndex: 2, pagesCount: 3, expected: 2 },
-//       { pageIndex: 7, pagesCount: 3, expected: 2 },
-//     ]
-//     testCases.forEach(({
-//       pageIndex,
-//       pagesCount,
-//       expected,
-//     }) => {
-//       expect(getPageIndex({
-//         pageIndex,
-//         pagesCount,
-//       })).toBe(expected)
-//     })
-//   })
-//   it('throws error if pagesCount is less than 1', () => {
-//     const pageIndex = 5
-//     const pagesCount = 0
-//     expect(
-//       () => getPageIndex({
-//         pageIndex,
-//         pagesCount,
-//       })
-//     ).toThrowError('pagesCount must be at least 1')
-//   })
-// })
+describe('getPartialPageSize', () => {
+  it('returns result as expected if particlesToShow <= particlesToScroll', () => {
+    const testCases = [
+      {
+        particlesCountWithoutClones: 9,
+        particlesToShow: 2,
+        particlesToScroll: 3,
+        expected: 0,
+      }, {
+        particlesCountWithoutClones: 15,
+        particlesToShow: 4,
+        particlesToScroll: 5,
+        expected: 0,
+      }, {
+        particlesCountWithoutClones: 16,
+        particlesToShow: 4,
+        particlesToScroll: 5,
+        expected: 1,
+      }, {
+        particlesCountWithoutClones: 17,
+        particlesToShow: 4,
+        particlesToScroll: 5,
+        expected: 2,
+      }, {
+        particlesCountWithoutClones: 18,
+        particlesToShow: 4,
+        particlesToScroll: 5,
+        expected: 3,
+      }, {
+        particlesCountWithoutClones: 8,
+        particlesToShow: 2,
+        particlesToScroll: 2,
+        expected: 0,
+      }
+    ]
 
-// describe('getPartialPageSize', () => {
-//   it('getPartialPageSize', () => {
-//     // ==== pagesToShow <= pagesToScroll
-//     const r0 = getPartialPageSize({
-//       pagesCountWithoutClones: 9,
-//       pagesToShow: 2,
-//       pagesToScroll: 3,
-//     })
-//     expect(r0).toBe(0)
+    testCases.forEach(({
+      particlesCountWithoutClones,
+      particlesToShow,
+      particlesToScroll,
+      expected,
+    }) => {
+      expect(getPartialPageSize({
+        particlesCountWithoutClones,
+        particlesToShow,
+        particlesToScroll,
+      })).toBe(expected)
+    })
+  })
 
-//     const r1 = getPartialPageSize({
-//       pagesCountWithoutClones: 15,
-//       pagesToShow: 4,
-//       pagesToScroll: 5,
-//     })
-//     expect(r1).toBe(0)
-
-//     const r2 = getPartialPageSize({
-//       pagesCountWithoutClones: 16,
-//       pagesToShow: 4,
-//       pagesToScroll: 5,
-//     })
-//     expect(r2).toBe(1)
-
-//     const r3 = getPartialPageSize({
-//       pagesCountWithoutClones: 17,
-//       pagesToShow: 4,
-//       pagesToScroll: 5,
-//     })
-//     expect(r3).toBe(2)
-
-//     const r4 = getPartialPageSize({
-//       pagesCountWithoutClones: 18,
-//       pagesToShow: 4,
-//       pagesToScroll: 5,
-//     })
-//     expect(r4).toBe(3)
-
-//     const r5 = getPartialPageSize({
-//       pagesCountWithoutClones: 8,
-//       pagesToShow: 2,
-//       pagesToScroll: 2,
-//     })
-//     expect(r5).toBe(0)
-
-//     // ====== pagesToScroll < pagesToShow
-
-//     const r6 = getPartialPageSize({
-//       pagesCountWithoutClones: 8,
-//       pagesToShow: 4,
-//       pagesToScroll: 2,
-//     })
-//     expect(r6).toBe(2)
-
-//     const r7 = getPartialPageSize({
-//       pagesCountWithoutClones: 7,
-//       pagesToShow: 4,
-//       pagesToScroll: 3,
-//     })
-//     expect(r7).toBe(1)
-
-//     const r8 = getPartialPageSize({
-//       pagesCountWithoutClones: 8,
-//       pagesToShow: 4,
-//       pagesToScroll: 3,
-//     })
-//     expect(r8).toBe(2)
-
-//     const r9 = getPartialPageSize({
-//       pagesCountWithoutClones: 8,
-//       pagesToShow: 2,
-//       pagesToScroll: 2,
-//     })
-//     expect(r9).toBe(0)
-
-//     const r10 = getPartialPageSize({
-//       pagesCountWithoutClones: 9,
-//       pagesToShow: 4,
-//       pagesToScroll: 3,
-//     })
-//     expect(r10).toBe(3)
-
-//     const r11 = getPartialPageSize({
-//       pagesCountWithoutClones: 8,
-//       pagesToShow: 3,
-//       pagesToScroll: 2,
-//     })
-//     expect(r11).toBe(2)
-
-//     const r12 = getPartialPageSize({
-//       pagesCountWithoutClones: 6,
-//       pagesToShow: 3,
-//       pagesToScroll: 1,
-//     })
-//     expect(r12).toBe(2)
-
-//     const r13 = getPartialPageSize({
-//       pagesCountWithoutClones: 7,
-//       pagesToShow: 3,
-//       pagesToScroll: 1,
-//     })
-//     expect(r13).toBe(2)
-//   })
-// })
+  it('returns result as expected if particlesToShow > particlesToScroll', () => {
+    const testCases = [
+      {
+        particlesCountWithoutClones: 8,
+        particlesToShow: 4,
+        particlesToScroll: 2,
+        expected: 2,
+      }, {
+        particlesCountWithoutClones: 7,
+        particlesToShow: 4,
+        particlesToScroll: 3,
+        expected: 1,
+      }, {
+        particlesCountWithoutClones: 8,
+        particlesToShow: 4,
+        particlesToScroll: 3,
+        expected: 2,
+      }, {
+        particlesCountWithoutClones: 8,
+        particlesToShow: 2,
+        particlesToScroll: 2,
+        expected: 0,
+      }, {
+        particlesCountWithoutClones: 9,
+        particlesToShow: 4,
+        particlesToScroll: 3,
+        expected: 3,
+      }, {
+        particlesCountWithoutClones: 8,
+        particlesToShow: 3,
+        particlesToScroll: 2,
+        expected: 2,
+      }, {
+        particlesCountWithoutClones: 6,
+        particlesToShow: 3,
+        particlesToScroll: 1,
+        expected: 2,
+      }, {
+        particlesCountWithoutClones: 7,
+        particlesToShow: 3,
+        particlesToScroll: 1,
+        expected: 2,
+      }
+    ]
 
+    testCases.forEach(({
+      particlesCountWithoutClones,
+      particlesToShow,
+      particlesToScroll,
+      expected,
+    }) => {
+      expect(getPartialPageSize({
+        particlesCountWithoutClones,
+        particlesToShow,
+        particlesToScroll,
+      })).toBe(expected)
+    })
+  })
+})