Discussion on: Daily JavaScript Challenge #JS-124: Find Number of Vowels in a String

[Misael Braga de Bitencourt]

const countVowels = word => {
    const vowels = [...'aeiouáéíóúâêîôûàèìòùãẽĩõũ'];
    return [...word.toLowerCase()].reduce((counter, current) => counter += vowels.indexOf(current) === -1 ? 0 : 1, 0);
}

[Robert Myers]

Why use spread instead of the string iterator directly?

[Misael Braga de Bitencourt]

It is really not necessary. Just for deal it implicityly as a list.