/* 生成器 */
function* gen() {
    yield Promise.resolve("lxl");
    yield "lxl2";
    yield "lxl3";
    yield "lxl4";
}
/* 可以根据done 1/0 */
const genFun = gen();
console.log(genFun.next());
console.log(genFun.next());
console.log(genFun.next());
console.log(genFun.next());
console.log(genFun.next());
/* set map */
let set = new Set([1, 1, 2, 2, 3, 3]); // 天然去重
console.log(set);
let map = new Map();
map.set('key', "lxlxlxl");
console.log(map.get('key'));
/* 迭代器 */
const each = (value) => {
    let It = value[Symbol.iterator]();
    let next = { done: false };
    while (!next.done) {
        next = It.next();
        if (!next.done) {
            console.log(next.value);
        }
    }
};
each(map);
// 迭代器语法糖 for of 对象不能使用
for (let e of map) {
    console.log(e);
}
/* 结构 iterator */
let [l1, l2, l3] = [1, 2, 3];
let a1 = [1, 2, 3];
let a2 = [...a1];