Why does the following setTimeout print straight away?

Question

The following prints my message straight away

setTimeout(console.log('delayed hello world'), 10000);

It's a little bit counterintuitive. And since my message print straight away what happens at the end of 10 seconds?

Answer 1

You need to use anonymously function for that:

setTimeout(function() { console.log('delayed hello world') }, 10000);

See more about passing params to setTimeout function at MDN

Answer 2

You are running console.log (because you have () on the end of it) and passing its return value to setTimeout instead of passing a function.

var myFunction = function () { console.log('delayed hello world'); }
setTimeout(myFunction, 10000);