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Function sleep in JavaScript

 4 years ago
source link: https://www.tuicool.com/articles/eIrmeiR
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In Java, Thread.sleep causes the current thread to suspend execution for a specified period.

This is an efficient means of making processor time available to the other threads of an application or other applications that might be running on a computer system. However, JavaScript does NOT have such a native implementation. Thanks to async function , we can emulate the behavior: 

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

Use case: print number 1 to 5 per second in consecutive way.

Async & Await implementation 

async function one2FiveInAsync() {
  for(let i = 1; i <= 5; i++) {
    console.log(i);
    await sleep(1000)
  }
}

one2FiveInAsync();

Promise implementation 

function one2FiveInPromise() {
  function logAndSleep(i) {
    console.log(i);
    if (i === 5) {
      return;
    }
    return sleep(1000).then(() => logAndSleep(i + 1));
  }

  logAndSleep(1);
}

one2FiveInPromise();

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