what does !function() means in Javascript?

Question

I can read and write some JavaScript, but today I came across a .js file starting with

!function() {
 /*
  code here
 */
}.call(window);

Question

what does ! infront of function means?

That's just a normal use of the `!` operator, which returs the opposite of a boolean value. If the anonymous function returns `true`, the `!` negates the result so that it's `false`. — jahroy, Jun 20 '13 at 19:07

score 2 · Accepted Answer · answered Jun 20 '13 at 19:04

2

It returns "not" (!) of the result of a calling the anonymous function with a "this" of window.

answered Jun 20 '13 at 19:04

Peter Alfvin

score 1 · Answer 2 · answered Jun 20 '13 at 19:03

1

Negating the result of .call(window). Not the function.

answered Jun 20 '13 at 19:03

djechlin

But `.call(window)` is in fact calling the `function`, is it not (no pun intended)? – Peter Alfvin Jun 20 '13 at 19:06

2 Answers2