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Javascript – Can I write a program to count the number of vowels using string.includes() and for of loop?

I have tried passing strings to the getCount function that contain ‘aeiou’ and not but the value of vowelsCount is always 0.
I tried using string includes() function using the documentation, but it always returns count as 0, I have the code with which we can get the exact number of vowels in a string, but I prefer to use the approach taught by MDN docs.
This is the approach i prefered:

const vowelCount = str => {
 
let voweslCount = 0;

for ( let char of str){

if (str.includes('aeiou'))

voweslCount++;

}

return voweslCount;

}
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2

Answers


  1. 0

    Try splitting up the problem into smaller easier to reason about functions:

    /**
 * @const {Array<string>} VOWELS - An array of english vowel characters.
 * Note under ~100 or so elements, Array lookup is faster than a Set despite O(n) vs O(1) lookup time complexity, respectively.
 */
const VOWELS = ['a', 'e', 'i', 'o', 'u'];

/**
 * Checks if a character is a vowel.
 * @param {string} char - The character to check.
 * @returns {boolean} True if the character is a vowel, otherwise false.
 */
function isVowel(char) {
  // Convert character to lowercase to handle both uppercase and lowercase letters.
  return VOWELS.includes(char.toLowerCase());
}

/**
 * Counts the number of vowels in a given string.
 * @param {string} str - The string to count vowels in.
 * @returns {number} The number of vowels in the string.
 */
function vowelCount(str) {
  let vowelsCount = 0;
  for (let char of str) {
    if (isVowel(char)) {
      vowelsCount++;
    }
  }
  return vowelsCount;
  // Alternatively: return Array.from(str).filter(isVowel).length;
}

// Example usage.
const exampleString = "Hello World!";
console.log(`Number of vowels in "${exampleString}": ${vowelCount(exampleString)}`);
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  2. 0

    You can also start by creating an array containing each letter of the string, then transform each letter of that array into an array with map()

    function countVowels(str){
  let counter = 0
  let arrayOfStr = Array.from(str.toLowerCase())
  let arrayOfArray = arrayOfStr.map(elem=>[elem])
  for(let i=0;i<arrayOfArray.length;i++) {
    if(arrayOfArray[i].includes('a') || arrayOfArray[i].includes('e') || arrayOfArray[i].includes('i') || arrayOfArray[i].includes('o') || arrayOfArray[i].includes('u') || arrayOfArray[i].includes('y')){
      counter+=1
    }
  }
  return (counter) 
}



console.log(countVowels('Hello World'))

/* you can also loop through arrayOfArray with forEach as below*/

function countVowels2(str){
  let counter = 0
  let arrayOfStr = Array.from(str.toLowerCase())
  let arrayOfArray = arrayOfStr.map(elem=>[elem])
  arrayOfArray.forEach((elem)=>{
    if(elem.includes('a') || elem.includes('e') || elem.includes('i') || elem.includes('o') || elem.includes('u') || elem.includes('y')){
      counter+=1
    }
  })
  return counter
}

console.log(countVowels2('Hello World'))

    function. Then check with includes() if each array containing letters includes vowels

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