How to create a sleep/delay in nodejs that is Blocking?

Question

I\'m currently trying to learn nodejs and a small project I\'m working is writing an API to control some networked LED lights.

The microprocessor controlling the LED

Answer 1

With ECMA script 2017 (supported by Node 7.6 and above), it becomes a one-liner:

function sleep(millis) {
  return new Promise(resolve => setTimeout(resolve, millis));
}

// Usage in async function
async function test() {
  await sleep(1000)
  console.log("one second has elapsed")
}

// Usage in normal function
function test2() {
  sleep(1000).then(() => {
    console.log("one second has elapsed")
  });
}