refactoring created function

src/differenceInHours/index.ts

@@ -1,6 +1,6 @@
 import differenceInMilliseconds from '../differenceInMilliseconds/index'
 import requiredArgs from '../_lib/requiredArgs/index'
-import removesNegativeZeroIfPresent from '../utils/removesNegativeZeroIfPresent'
+import getRoundedValue from '../utils/getRoundedValue'
 
 const MILLISECONDS_IN_HOUR = 3600000
 
@@ -35,5 +35,5 @@ export default function differenceInHours(dirtyDateLeft: Date | number, dirtyDat
   const diff =
     differenceInMilliseconds(dirtyDateLeft, dirtyDateRight) /
     MILLISECONDS_IN_HOUR
-  return removesNegativeZeroIfPresent(diff > 0 ? Math.floor(diff) : Math.ceil(diff))
+  return getRoundedValue(diff)
 }

src/differenceInMinutes/index.js

@@ -1,6 +1,6 @@
 import differenceInMilliseconds from '../differenceInMilliseconds/index'
 import requiredArgs from '../_lib/requiredArgs/index'
-import removesNegativeZeroIfPresent from '../utils/removesNegativeZeroIfPresent'
+import getRoundedValue from '../utils/getRoundedValue'
 
 var MILLISECONDS_IN_MINUTE = 60000
 
@@ -43,7 +43,5 @@ export default function differenceInMinutes(dirtyDateLeft, dirtyDateRight) {
   var diff =
     differenceInMilliseconds(dirtyDateLeft, dirtyDateRight) /
     MILLISECONDS_IN_MINUTE
-  return removesNegativeZeroIfPresent(
-    diff > 0 ? Math.floor(diff) : Math.ceil(diff)
-  )
+  return getRoundedValue(diff)
 }

src/differenceInQuarters/index.ts

@@ -1,6 +1,6 @@
 import differenceInMonths from '../differenceInMonths/index'
 import requiredArgs from '../_lib/requiredArgs/index'
-import removesNegativeZeroIfPresent from '../utils/removesNegativeZeroIfPresent'
+import getRoundedValue from '../utils/getRoundedValue'
 
 /**
  * @name differenceInQuarters
@@ -31,5 +31,5 @@ export default function differenceInQuarters(
   requiredArgs(2, arguments)
 
   const diff = differenceInMonths(dirtyDateLeft, dirtyDateRight) / 3
-  return removesNegativeZeroIfPresent(diff > 0 ? Math.floor(diff) : Math.ceil(diff))
+  return getRoundedValue(diff)
 }

src/differenceInSeconds/index.ts

@@ -1,6 +1,6 @@
 import differenceInMilliseconds from '../differenceInMilliseconds/index'
 import requiredArgs from '../_lib/requiredArgs/index'
-import removesNegativeZeroIfPresent from '../utils/removesNegativeZeroIfPresent'
+import getRoundedValue from '../utils/getRoundedValue'
 
 /**
  * @name differenceInSeconds
@@ -35,5 +35,5 @@ export default function differenceInSeconds(
   requiredArgs(2, arguments)
 
   const diff = differenceInMilliseconds(dirtyDateLeft, dirtyDateRight) / 1000
-   return removesNegativeZeroIfPresent(diff > 0 ? Math.floor(diff) : Math.ceil(diff))
-}
+  return getRoundedValue(diff)
+}

src/differenceInWeeks/index.ts

@@ -1,6 +1,6 @@
 import differenceInDays from '../differenceInDays/index'
 import requiredArgs from '../_lib/requiredArgs/index'
-import removesNegativeZeroIfPresent from '../utils/removesNegativeZeroIfPresent'
+import getRoundedValue from '../utils/getRoundedValue'
 
 /**
  * @name differenceInWeeks
@@ -52,5 +52,5 @@ export default function differenceInWeeks(
   requiredArgs(2, arguments)
 
   const diff = differenceInDays(dirtyDateLeft, dirtyDateRight) / 7
-  return removesNegativeZeroIfPresent(diff > 0 ? Math.floor(diff) : Math.ceil(diff))
+  return getRoundedValue(diff)
 }

src/utils/getRoundedValue/index.ts

@@ -0,0 +1,8 @@
+export default function getRoundedValue(number: number): number {
+	if(number > 0){
+		return Math.floor(number) 
+	} else {
+		const result = Math.ceil(number)
+		return Object.is(result, -0) ? 0 : result
+	}
+}

src/utils/getRoundedValue/test.ts

@@ -0,0 +1,23 @@
+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import getRoundedValue from '.'
+
+describe('getRoundedValue', () => {
+
+  it("floor rounds if argument is greater than 0", () => {
+    const result = getRoundedValue(1.95)
+    assert(result === 1)
+  })
+
+  it("ceil rounds if argument is less than 0", () => {
+    const result = getRoundedValue(-0.99)
+    assert(result === 0)
+  })
+
+  it("returns 0 if the argument is rounded to -0 #2555", () => {
+    const result = getRoundedValue(-0.003)
+    assert(Object.is(result, 0))
+  })
+})