iterator.01.js

iterator.01.js

/* array */
let iterable = [10, 20, 30];

for (let value of iterable) {
  console.log(value); // 10 20 30
}

/* string */
let iterable = "boo";

for (let value of iterable) {
  console.log(value); // "b" "o" "o"
}

/* Typed Array */
let iterable = new Uint8Array([0x00, 0xff]);

for (let value of iterable) {
  console.log(value); // 0 255
}

/* Map */
let iterable = new Map([["a", 1], ["b", 2], ["c", 3]]);

for (let entry of iterable) {
  console.log(entry); // [a, 1] [b, 2] [c, 3]
}

for (let [key, value] of iterable) {
  console.log(value); // 1 2 3
}

/* Set */
let iterable = new Set([1, 1, 2, 2, 3, 3]);

for (let value of iterable) {
  console.log(value); // 1 2 3
}

/* DOM Collection */
let articleParagraphs = document.querySelectorAll("article > p");

for (let paragraph of articleParagraphs) {
  paragraph.classList.add("read");
}