I was looking at code from Mozilla that add a filter method to Array and it had a line of code that confused me.  var len = this.length >>> 0;   I have never seen >>> used in JavaScript before. What is it and what does it do?...
x <<= y  (x = x << y) x >>= y  (x = x >> y) x >>>= y (x = x >>> y) x &= y   (x = x & y) x ^= y   (x = x ^ y) x |= y   (x = x | y)   What do these different operators do?...
I was wondering what the = +_ operator means in JavaScript.  It looks like it does assignments.  Example:  hexbin.radius = function(_) {    if (!arguments.length)        return r;    r = +_;    dx = r * 2 * Math.sin(Math.PI / 3);    dy = r * 1.5;...
I've been trying to understand the difference between JavaScript's comparison operators: identity and equality. From what I've read, if you check the equality of two objects using ==, JavaScript will try to figure out if they are the sa...
I was reading the re-introduction to JavaScript on MDN and in the section Numbers it said that you can convert a string to a number simply by adding a plus operator in front of it.  For example:  +"42" which would yield the number output of...
What's the difference between | and || in Javascript?  Furthermore, what's the difference between & and &&?...
Today I saw a JavaScript syntax (when invoking a function) that is unfamiliar to me. It was like:  def('Person') ({   init: function(name) {this.name=name;}   ,speak: function(text) {alert(text || 'Hi, my name is ' + this.name);} });...
Is there some way I can define String[int] to avoid using String.CharAt(int)?...
In Python, and maybe in Javascript, the boolean or and and operators return one of the operands, instead of true or false.   In Python, one of the operands is returned: '' || 'hello' == 'hello' In comparison, in PHP: ''...
I am now confused about ! operator in JavaScript. My understanding was ! operator operates only on boolean. But a comment to one of my answers says it can operate on anything and returns a boolean, which happened to be true after I did some tests.  a...

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