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merge: added reduceRight & trim method (TheAlgorithms#961)
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2 files changed

+19
-18
lines changed

2 files changed

+19
-18
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String/ReverseWords.js

Lines changed: 11 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -1,16 +1,17 @@
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/**
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* @function reverseWords
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* @param {string} str
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* @returns {string} - reverse string
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*/
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const reverseWords = (str) => {
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if (typeof str !== 'string') {
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throw new TypeError('The given value is not a string')
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}
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// Split string into words
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// Ex. "I Love JS" => ["I", "Love", "JS"]
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const words = str.split(' ')
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// reverse words
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// ["I", "Love", "JS"] => ["JS", "Love", "I"]
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const reversedWords = words.reverse()
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// join reversed words with space and return
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// ["JS", "Love", "I"] => "JS Love I"
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return reversedWords.join(' ')
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return str
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.split(/\s+/) // create an array with each word in string
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.reduceRight((reverseStr, word) => `${reverseStr} ${word}`, '') // traverse the array from last & create an string
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.trim() // remove the first useless space
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}
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export { reverseWords }
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export default reverseWords

String/test/ReverseWords.test.js

Lines changed: 8 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -1,12 +1,6 @@
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import { reverseWords } from '../ReverseWords'
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describe('reverseWords', () => {
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it('expects to reverse words to return a joined word', () => {
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expect(reverseWords('I Love JS')).toBe('JS Love I')
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expect(reverseWords('Hello World')).toBe('World Hello')
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expect(reverseWords('The Algorithms Javascript')).toBe('Javascript Algorithms The')
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})
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import reverseWords from '../ReverseWords'
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describe('Testing the reverseWords function', () => {
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it.each`
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input
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${123456}
@@ -21,4 +15,10 @@ describe('reverseWords', () => {
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}).toThrow('The given value is not a string')
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}
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)
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it('expects to reverse words to return a joined word', () => {
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expect(reverseWords('I Love JS')).toBe('JS Love I')
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expect(reverseWords('Hello World')).toBe('World Hello')
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expect(reverseWords('The Algorithms Javascript')).toBe('Javascript Algorithms The')
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})
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})

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