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Showing content from http://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Global_Objects/String/Symbol.iterator below:

String.prototype[@@iterator]() - JavaScript | MDN

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La méthode [@@iterator]() renvoie un nouvel objet Iterator qui itère sur les points de code (codets) d'une chaîne de caractères, en renvoyant chaque point de code sous forme d'une chaîne de caractères.

const iterable1 = {};

iterable1[Symbol.iterator] = function* () {
  yield 1;
  yield 2;
  yield 3;
};

console.log([...iterable1]);
// Expected output: Array [1, 2, 3]

chaîneDeCaractères[Symbol.iterator];

Un nouvel objet Iterator.

var chaîne = "A\uD835\uDC68";

var chaîneIter = chaîne[Symbol.iterator]();

console.log(chaîneIter.next().value); // "A"
console.log(chaîneIter.next().value); // "\uD835\uDC68"

var chaine = "A\uD835\uDC68B\uD835\uDC69C\uD835\uDC6A";

for (var c of chaine) {
  console.log(c);
}
// "A"
// "\uD835\uDC68"
// "B"
// "\uD835\uDC69"
// "C"
// "\uD835\uDC6A"

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