I created a jsperf to test nested vs. non-nested and function expressions vs. function declarations, and I was surprised to see that the nested test cases performed 20x faster than non-nested.

Feb 24, 2012 · Possible Duplicate: JavaScript: var functionName = function() {} vs function functionName() {} Declaring functions in JavaScript I've seen 2 different syntaxes for defining …

Another way to navigate to the location of a function definition would be to break in debugger somewhere you can access the function and enter the functions fully qualified name in the console.

Function expressions can be stored in a variable so they do not need function names. They will also be named as an anonymous function (a function without a name). To invoke (call) these functions they …

I would like a JavaScript function to have optional arguments which I set a default on, which get used if the value isn't defined (and ignored if the value is passed). In Ruby you can do it like th...

Feb 12, 2017 · Of course, what if we want 4 parameters, or 5, or 6? We don't want to write a new version of the function for all possible quantities of parameters. The spread operator () allows us to …

Function hoisting is a feature in JavaScript because it is a good idea. When you have an internal function which is often the utility of inner functions, adding it to the beginning of the outer function is …

Dec 30, 2015 · Is there a way in Javascript to define a function and immediately call it, in a way that allows it to be reused? I know you can do one-off anonymous functions: (function(i) { var product = i...

Explore the possibility of modifying a JavaScript function after its declaration and understand the nuances involved in such alterations.

Dec 3, 2008 · What you should be knowing is that functions are actually objects in JavaScript; internally we have created an object for above function and given it a name called fn or the reference to the …