How can I create an Asynchronous function in Javascript?

You cannot make a truly custom asynchronous function. You’ll eventually have to leverage on a technology provided natively, such as:

  • setInterval
  • setTimeout
  • requestAnimationFrame
  • XMLHttpRequest
  • WebSocket
  • Worker
  • Some HTML5 APIs such as the File API, Web Database API
  • Technologies that support onload
  • … many others

In fact, for the animation jQuery uses setInterval.

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