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68ca0ceeef
* 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
22 lines
534 B
JavaScript
22 lines
534 B
JavaScript
/**
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* @function countVowels
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* @description Given a string of words or phrases, count the number of vowels.
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* @param {String} str - The input string
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* @return {Number} - The number of vowels
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* @example countVowels("ABCDE") => 2
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* @example countVowels("Hello") => 2
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*/
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const countVowels = (str) => {
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if (typeof str !== 'string') {
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throw new TypeError('Input should be a string')
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}
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const vowelRegex = /[aeiou]/gi
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const vowelsArray = str.match(vowelRegex) || []
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return vowelsArray.length
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}
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export { countVowels }
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