es7-iterator-async-await.js

es7-iterator-async-await.js

// 自行實作迭代器
const vertex1 = {
    x: 1,
    y: 2,
    z: 3,
    [Symbol.iterator]() {
        const keys = Object.keys(this);
        let i = 0;
        return {
            next: () => {
                return {
                    value: (async () => {
                        return this[keys[i++]];
                    })(),
                    done: keys.length === i - 1
                };
            }
        };
    }
};

async function main() {
    for(let p of vertex1) {
        console.log(await p);
    }
}

main();