async for loop helper example

async-for-each.js

const asyncForEach = async (array, cb) => {

    for (let index = 0; index < array.length; index++) {

        await cb(array[index], index, array);

    }

};

const wait = async (cb, timeout) => {
    
    return new Promise((resolve) => {
        setTimeout(() => {
            cb();
            resolve();
        }, timeout);
    });
}

(async () => {

    console.log('START');
    
    await wait(() => {
        console.log('Before loop');
    }, 1000);
    
    await asyncForEach([1,2,3,4], async (item, idx, array) => {
    
        await wait(() => {
            console.log(item);
        }, 2000);
    
    });

    await wait(() => {
        console.log('After loop');
    }, 1000);

    console.log('END');

})();