What is the scope of variables in javascript? Do they have the same scope inside as opposed to outside a function? Or does it even matter? Also, where are the variables stored if they are defined globally?...
Using instance methods as callbacks for event handlers changes the scope of this from "My instance" to "Whatever just called the callback". So my code looks like this  function MyObject() {   this.doSomething = function() {     ......
I was facing an issue while developing this small userscript. When I wanted to block every XMLHttpRequest from the running website with my script, nothing was happening (at least with Chrome):  function main() {   // Override XHR.open with a custom...
Just a quick question about the scoping of JavaScript variables.  Why does the alert() function print the value of i instead of returning undefined?  $(document).ready(function () {     for(var i = 0; i < 10; i += 1){     }       alert("What...
As I understand it, the IIFE pattern is a work around to the fact that ES5 and below do not have a way to create block scopes.  By wrapping everything in a function and immediately invoking it, we can create a scope.  Now that let and const will ga...
I want to return StudentId to use elsewhere outside of the scope of the $.getJSON()  j.getJSON(url, data, function(result) {     var studentId = result.Something; });  //use studentId here   I would imagine this has to do with scoping, but it doesn...
I have this ajax call to a doop.php.       function doop(){         var old = $(this).siblings('.old').html();         var new = $(this).siblings('.new').val();          $.ajax({             url: 'doop.php',             type...
Up until now I just put all my jQuery goodness inside the $(document).ready() function, including simple functions used in certain user interactions.   But functions that don´t require the DOM document to be loaded or are only called afterwards an...
The difference between these two keywords in terms of scoping has already been thoroughly discussed here, but I was wondering if there is any kind of performance difference between the two, and if so, is it negligible, or at what point would it bec...

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