promise-sequence

function sequence(list, results, resolve, reject) {
    if (!results) {
        return new Promise((resolve, reject) => sequence(list, [], resolve, reject));//first time
    } else {
        if (!results){
            results = [];//one time
        }
        if (list.length == 0) {
            return resolve(results);//last time
        } else {
            list[0]().then(result => { //each time
                results.push(result);
                list.splice(0, 1);
                sequence(list, results, resolve, reject);
            }).catch(err => {
                reject(err);
            });
        }
    }
}

//Testing
/*
sequence([
    () => new Promise((resolve, reject) => {
        setTimeout(() => {
            console.log('Foo');
            resolve('Foo rocks!');
        },2000);
    }),
    () => new Promise((resolve, reject) => {
        setTimeout(() => {
            console.log('Bar');
            resolve('Bar completed');
        },3000);
    })
]).then(results => {
    console.log('YES!', results)
})
*/