I know that in JavaScript you can do:  var oneOrTheOther = someOtherVar || "these are not the droids you are looking for...";   where the variable oneOrTheOther will take on the value of the first expression if it is not null, undefined, or...
I don't understand how &&, ||, and ! work... both with bools and other data types. How do you use them?...
In javascript, if we have some code such as  var a = "one"; var b = q || a; alert (b);   The logical OR operator will assign a's value to b, and the alert will be "one."  Is this limited to assignments only or can we use it everyw...
Is there any meaningful difference between  condition && console.log("this may run");   and  if (condition) console.log("this may run);   If not, which is a best practice?...
I am getting back into web development, and have been trying to go over the nuances of jscript recently. I was pouring through the source of the THREEx extension library built on top of Three.JS and noticed this function  THREEx.KeyboardState.prototy...
I'm having a hard time writing up what seems should be a simple if statement! I need it to say if mod does not equal a, b, or c - then do this. Here is what I was trying but have been unsuccessful:  var mod = CURRENT_MODULE_ID; if (mod != "58...
What is the difference between these various uses of the "&&" logical operator?  From Oliver Steele's Functional.js library. Line 4, "args.length && arg":  0 Function.prototype.partial = function(){ 1    var fn = t...
While debugging javascript written by someone else, I came across some code that I've not seen before.  Here's a sample:  function doSomething() {     //doing something here... }  function doItNow() {     //other logic...     doSomething &...
Why is there no logical xor in JavaScript?...
I was going through some Javascript code used to validate form entry and I noticed an if statement that read if (!(x < y && y > x)) {...}  My initial thought was that this sort of tautological construction is completely redundant, and o...

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