generator-asynchronous-iteration-until-breaks

var co = require('co');

function getResult(item) {
    return new Promise((resolve, reject) => {
        setTimeout(() => {
            if(item > 5) {
                reject('Break! Last page reached.');
            } else {
                resolve(item * 2);
            }
        }, 100);
    });
}

function* sequence() {
    let i = 1;
    let arr = [];
    try {
        while(i++) {
            arr.push(yield getResult(i));
        }
    } catch(e) {
        console.log(e);
    }
    return arr;
}

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