Promises in a loop

It’s interesting to see what happen to promises on for loops. Typically, this cause some over awaiting when it would be better to execute those Promises concurrently.

function holaPromise(message) {
 return new Promise(function(resolve, reject) {
// the function is executed automatically when the promise is constructed
// after 1 second signal that the job is done with the result "done"
setTimeout(() => {
            console.log("timeout :: ", message);
            return resolve("done");
        }, 1000);
    });
}

async function simple(message) {
    console.log(message);
}

async function mainMethod() {
  for(const run of[1, 2, 3]) {
    await holaPromise(run);
  }
}

async function parallel(){
  return Promise.allSettled([1,2,3].map((v)=>holaPromise(v)));
}


// Compare the sequential
mainMethod().then(result => console.log('finished :: ', result)).catch(error => console.error(error));

// And the concurrent
parallel().then(result => console.log('finished :: ', result)).catch(error => console.error(error));