Given this snippet of JavaScript...  var a; var b = null; var c = undefined; var d = 4; var e = 'five';  var f = a || b || c || d || e;  alert(f); // 4   Can someone please explain to me what this technique is called (my best guess is in th...
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...
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 have a small issue with understanding why I'm getting this output.    var arr = ["a", "b", "c", "d", "e", "f"]; arr.splice(2,0,"1"); console.log(arr);    var arr2 = ["a", "b...
I want to do something to a couple of variables using operators in quick succession. I don't think what I want to do is important as such; my question is more about the fundamentals of JavaScript evaluation.  In the three examples below, I try to...
var width = 10; var data = image.data; var height = 10;  for ( var x = 0; x < width; x++ ) {    for ( var y = 0; y < height; y++ )      var index = 4 * (y * height +  x); // 0      var local_variable = ArbitraryClassInstance.getBrightness(x, y)...
The multiple assignment (or is it called chaining?) that I'm talking about is assignment such as:  a = b = c = 2;   ...after which a, b, and c are all equal to 2;  My question of optimization is, given the following code:  var dom1 = document.get...
Ive got an assignment and am a bit stuck.  Need to match an input string to the values in a constant, but I am matching individual characters.  My constant would be ALPHABET = 'ABCDEFGHIJKLMNOPQRSTUWXYZ'  My input would be, var input = 'A...
Is it possible to use destructuring assignment in a JavaScript class' constructor to assign the instance variables similar to how you can do it to normal variables?  The following example works:  var options = {one: 1, two: 2}; var {one, two} = o...

Tags

Recent Questions

Top Questions

Home Tags Terms of Service Privacy Policy DMCA Contact Us

©2020 All rights reserved.