This is a named function expression with the name test. Inside, I assign 123 to a variable, also named test. Then test is logged. The function prints its body in the console, but not 123. What is the reason for such behavior?  (function test() {   te...
In JavaScript, if I create a function expression like:  var foo = function foo() {   return 'Hello world!'; }   Is this okay? Will there be any problems that occur? Or should I do:  var foo = function baz() {   return 'Hello world!';...
I have this function on an object that I need to trace REALLY BADLY, along with the parent caller of the invocation and arguments passed to the caller.  This well works until minified:  var foo = {     FunctionToBeLogged: function GiveMeAName() {...
I'm trying to make sense of this code from another developer and my JavaScript knowledge is lacking. This function is supposed to take the header menu of a site and convert it into a mobile style menu.  I understand why jQuery is being passed in...
For a button, I need to set the function this calls, and the value used in that call, at runtime. I can do this like so:  var myfunction = /* ... */ var myvalue = /* ... */ button.setAttribute ("onclick", myfunction + "('" + myval...
The context:  I am reading the book You Don't Know JS: Up & Going, Chapter 2: Into JavaScript. In the Polyfilling section, the author gives the following example:  if (!Number.isNaN) {     Number.isNaN = function isNaN(x) {         return x !...
The following line:  var A = function def() {alert();};   Only A() invokes the function. def() does not. Why is it so? Isn't the left side a function delaration?...
This is an adaptation of what you'd find in john resig's Learning Advanced Javascript app.  var math = {     fact: function fact(n){         return n > 0 ? n * fact(n-1): 1;     },     fact1: function (n) {         return n > 0? n * mat...
According to hoisting definition:     Hoisting is a JavaScript mechanism where variables and function   declarations are moved to the top of their scope before code execution   Why do function declarations get hoisted and function expressions don'...

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