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...
While looking at some Javascript code for Mozilla's (Firefox) Add-on SDK, I saw kind of variable declaration I hadn't seen before:  var { foo, bar } = someFunction("whatever");  // just an example   See those curly braces around the v...
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)...
First, I had asked is it possible: How to create Javascript constants as properties of objects using const keyword?  Now, I gotta ask: why?  The answer to me seems to be 'just because', but it would be so useful to do something like this:  va...

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