Sleep in JavaScript - delay between actions

Question

Is there a way I can do a sleep in JavaScript before it carries out another action?

Example:

 var a = 1+3;
 // Sleep 3 seconds before the next action         


        

Answer 1

Try this function:

const delay = (ms, cb) => setTimeout(cb, ms)

Here is how you use it:

console.log("Waiting for 5 seconds.")
delay(5000, function() {
  console.log("Finished waiting for 5 seconds.")
})

Or go promise style:

const delay = ms => new Promise(resolve => {
    setTimeout(resolve, ms)
})

Here's a demo.