null created by ChrisLis - https://repl.it/HaK8/30

HaK8-30.js

// Write a function that takes a string and returns the number of vowels
// in the string. You may assume that all the letters are lower cased.
// You can treat "y" as a consonant.
//
// Difficulty: easy.

function count_vowels(string)
{
  var nbr_voyelles=0;
  var list_voyelles="aeiouyAEIOUY"
  for(var i=0;i<string.length;i++)
  {
    if(list_voyelles.includes(string[i]))
    {
      nbr_voyelles +=1
    }
  }
  return nbr_voyelles
}
console.log(count_vowels("abdc"))

// These are tests to check that your code is working. After writing
// your solution, they should all print true.

console.log("\nTests for //count_vowels")
console.log("===============================================")
    console.log('count_vowels("abcd") == 1: ' + (count_vowels('abcd') == 1))
    console.log('count_vowels("color") == 2: ' + (count_vowels('color') == 2))
    console.log('count_vowels("colour") == 3: ' + (count_vowels('colour') == 3))
    console.log('count_vowels("cecilia") == 4: ' + (count_vowels('cecilia') == 4))
console.log("===============================================")