Question

I have two versions of the code. Can someone let me know which is optimal and faster?

Version 1:

function showMsg(a)
{
    alert(a);
}
function invokeShowMsg()
{
    var msg = 'hi';
    showMsg(msg);
}
window.setTimeout(invokeShowMsg,1000);

Version 2:

function showMsg(a)
{
    alert(a);
}
window.setTimeout(function(){showMsg('hi');},1000);

One more doubt, is the Version 2 way of calling called “Closure”?

Answer 1

As far as speed goes, you will not notice any difference between the two whatsoever, so pick what you like.

I prefer #2, as it is cleaner and keeps the syntax readable:

setTimeout(function() {
  showMsg('hi');
}, 1000);