generator-asynchronous-iteration

var co = require('co');

function getResult(item) {
    return new Promise((resolve, reject) => {
       setTimeout(() => {
           resolve(item * 2);
       }, 100);
    });
}

function* sequence() {
    let i = 10;
    let arr = [];
    while(--i) {
        arr.push(yield getResult(i));
    }
    return arr;
}

co(function* () {
    let result = yield sequence();
    console.log(result);
});