let promise wait a couple of seconds before return

Question

I\'m having a function returning a promise. In this function, we call a third party vender to send some push notification through their server.

it looks like

Answer 1

Insert another promise in the chain which delays the next one:

apiGetLoggedInUser
    .then(user => {
        return new Promise(resolve => setTimeout(() => resolve(user), 3000));
    })
    .then(user => sendMessage(user.name))

Answer 2

The short version:

function wait(milliseconds) {
  return new Promise(resolve => setTimeout(resolve, milliseconds));
}

Example:

async function myFunc(user) {
  await wait(3000);

  sendMessage(user.name);
}

Answer 3

A different approach - useful if you want to do this sort of thing in many places

This bit is done once

Promise.prototype.thenWait = function thenWait(time) {
    return this.then(result => new Promise(resolve => setTimeout(resolve, time, result)));
};

Then you can use it, like this usage for your example, anywhere

apiGetLoggedInUser.thenWait(3000).then(user => sendMessage(user.name));

Answer 4

Create new promise which will call sendMessage after a timeout.

apiGetLoggedInUser.then(
  user => {
    return new Promise((resolve, reject) => {
       setTimeout(() => {
          sendMessage(user.name).then(resolve, reject);
       }, 3000)
    });
  }
)