Can someone explain to me why "this" is not equal to win or window in the following javascript IIFE code?

Question

When executing this code below, results are false, why? What is "this" bound to? I was expecting the results to be true in both alert statements

(function(win){

     alert("this == win: "+ this == win);         // false
     alert("this == window: "+ this == window);   // false

})(window);

https://stackoverflow.com/questions/3127429/how-does-the-this-keyword-work — Adam H, Sep 25 '18 at 18:49
Inside function this indicates function. Which in your case is anonymous function — Void Spirit, Sep 25 '18 at 18:51

score 7 · Accepted Answer · answered Sep 25 '18 at 18:52

7

It is nothing to do with this not equal window, it is an order of operation issue....

what the parser sees is this:

("this == win: "+ this) == win

Add in the correct parenthesis

(function(win){

     console.log("this == win: "+ (this == win));        
     console.log("this == window: "+ (this == window));   

})(window);

answered Sep 25 '18 at 18:52

epascarello

Isnt 'this' inside function should be function itself? – Void Spirit Sep 25 '18 at 18:55
No, it is based on the context of how it is called. You need to read the links that were posted as dupes. – epascarello Sep 25 '18 at 18:55
this upgrade my knowledge a lot – Nora Sep 25 '18 at 19:00

1 Answers1