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merge: optimize the countVowels algo (#886)

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* pref: optimize the count vowels algo

simplify the algo by using regex and String.prototype.match method, and modified the JS Doc

* fix: resolve all requests

* pref: optimize the algo by regex

ignore the useless traverse in best case by the help of regex and String.prototype.replace method

* test: add four new test cases

* Revert "test: add four new test cases"
This reverts commit 4609833da146beafe839682d7558edf9f64c96fc.

* style: fromat with standard js
This commit is contained in:
Fahim Faisaal
2022-02-17 18:00:04 +06:00
committed by GitHub
parent 9911410e70
commit 68ca0ceeef
1 changed files with 7 additions and 11 deletions
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18
String/CountVowels.js
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@ -1,8 +1,8 @@
/**
* @function countVowels
* @description Given a string of words or phrases, count the number of vowels.
* @param {String} url - The input string
* @return {Number} count
* @param {String} str - The input string
* @return {Number} - The number of vowels
* @example countVowels("ABCDE") => 2
* @example countVowels("Hello") => 2
*/
@ -11,15 +11,11 @@ const countVowels = (str) => {
if (typeof str !== 'string') {
throw new TypeError('Input should be a string')
}
const vowels = new Set(['a', 'e', 'i', 'o', 'u'])
let count = 0
for (let i = 0; i < str.length; i++) {
const char = str[i].toLowerCase()
if (vowels.has(char)) {
count++
}
}
return count
const vowelRegex = /[aeiou]/gi
const vowelsArray = str.match(vowelRegex) || []
return vowelsArray.length
}
export { countVowels }