diff --git a/String/ReverseWords.js b/String/ReverseWords.js
index 089d6575d4..9796c6208b 100644
--- a/String/ReverseWords.js
+++ b/String/ReverseWords.js
@@ -1,16 +1,17 @@
+/**
+ * @function reverseWords
+ * @param {string} str
+ * @returns {string} - reverse string
+ */
const reverseWords = (str) => {
if (typeof str !== 'string') {
throw new TypeError('The given value is not a string')
}
- // Split string into words
- // Ex. "I Love JS" => ["I", "Love", "JS"]
- const words = str.split(' ')
- // reverse words
- // ["I", "Love", "JS"] => ["JS", "Love", "I"]
- const reversedWords = words.reverse()
- // join reversed words with space and return
- // ["JS", "Love", "I"] => "JS Love I"
- return reversedWords.join(' ')
+
+ return str
+ .split(/\s+/) // create an array with each word in string
+ .reduceRight((reverseStr, word) => `${reverseStr} ${word}`, '') // traverse the array from last & create an string
+ .trim() // remove the first useless space
}
-export { reverseWords }
+export default reverseWords
diff --git a/String/test/ReverseWords.test.js b/String/test/ReverseWords.test.js
index 830be369ff..5808570665 100644
--- a/String/test/ReverseWords.test.js
+++ b/String/test/ReverseWords.test.js
@@ -1,12 +1,6 @@
-import { reverseWords } from '../ReverseWords'
-
-describe('reverseWords', () => {
- it('expects to reverse words to return a joined word', () => {
- expect(reverseWords('I Love JS')).toBe('JS Love I')
- expect(reverseWords('Hello World')).toBe('World Hello')
- expect(reverseWords('The Algorithms Javascript')).toBe('Javascript Algorithms The')
- })
+import reverseWords from '../ReverseWords'
+describe('Testing the reverseWords function', () => {
it.each`
input
${123456}
@@ -21,4 +15,10 @@ describe('reverseWords', () => {
}).toThrow('The given value is not a string')
}
)
+
+ it('expects to reverse words to return a joined word', () => {
+ expect(reverseWords('I Love JS')).toBe('JS Love I')
+ expect(reverseWords('Hello World')).toBe('World Hello')
+ expect(reverseWords('The Algorithms Javascript')).toBe('Javascript Algorithms The')
+ })
})
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