An one line implementation of sleep function in JavaScript with yield + generator.
Without any callbacks or promises.

Warning: this is an experiment and not safe for production!

Source

One line, just copy & paste:

let d=(f,t=f(),r=t.next())=>r.done||setTimeout(d,r.value,f,t)

Demo

Just run this in your Chrome console (Chrome >= 35, Firefox >= 38, Edge >= 13).

let d=(f,t=f(),r=t.next())=>r.done||setTimeout(d,r.value,f,t)  // <- source code
d(function *() {                                               // <- wrapper
                                                               // <- magic
  console.log('foo')  // output 'foo'
  yield 1000          // wait for 1 sec
  console.log('bar')  // output 'bar'
  yield 1000          // wait for 1 sec
  console.log('baz')  // output 'baz'
  
})

...

You could rename the d function to avoid conflicts.
Or just use it under a safe scope.

About

@quietshu https://github.com/quietshu/delay

MIT licensed.