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...
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...
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 &...
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...
Consider this condition:  (true & true & false & false & true) == true //returns: false   As you can see, the bitwise AND behavior is exactly like logical AND's:  (true && true && false && false &&...
I was experimenting with having multiple arguments in an if statement on both sides of the logical operator. I first started with the || operator, which worked as expected:  var a = 'apple', b = 'banana', c = 'cherry';  if (a...
I saw somewhere this code snippet:  var idx = SOME_VALUE;  var color = {   yellor: 1,   red: 2,   black: 0 };  var x = color[idx] || []; // Is this means if color[idx] is null, then return an empty array?   I can only guess the code var x = color[idx...
In C, when there are variables (assume both as int) i less than j, we can use the equation    i^=j^=i^=j   to exchange the value of the two variables. For example, let int i = 3, j = 5; after computed i^=j^=i^=j, I have i = 5, j = 3.  However, if I u...

Tags

Recent Questions

Top Questions

Home Tags Terms of Service Privacy Policy DMCA Contact Us

©2020 All rights reserved.