buyer-assist-assignment.js

buyer-assist-assignment.js

const myPromise1 = new Promise((resolve, reject) => {
  setTimeout(() => {
    resolve('myPromise1');
  }, 300);
});

const myPromise2 = new Promise((resolve, reject) => {
  setTimeout(() => {
    resolve('myPromise2');
  }, 300);
});

const myPromise3 = new Promise((resolve, reject) => {
  setTimeout(() => {
    resolve('myPromise3');
  }, 300);
});

const series = async (promises, callback) => {
  try{
    for (const p of promises) {
        const value = await p;
        callback(null, value);
    }
  }
  catch(ex){
      callback(ex, null);
  }
}

series([myPromise1, myPromise2, myPromise3], (err, value)=>{
    if(err) {
        throw err
    }
    console.log('value: ', value)
})