Question

How to count the number of each vowel in a string with JavaScript

Answer 1

function countNumberOfEachVowelInString(s) {
    const vowels = "aeiou";
    const countVowels = new Map();
    
    for (const ch of vowels) {
        countVowels.set(ch, 0);
    }
    
    return countVowels;
}

const s = "python c c++ c# java php javascript";
const countVowels = countNumberOfEachVowelInString(s);

for (const ch of s) {
    if (countVowels.has(ch)) {
        countVowels.set(ch, countVowels.get(ch) + 1);
    }
}

console.log(countVowels);



/*
run:

Map(5) { 'a' => 4, 'e' => 0, 'i' => 1, 'o' => 1, 'u' => 0 }

*/

 

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