I saw somewhere else said,  x && foo();  ?is equal to  if(x){     foo(); }   I tested it and they really did the same thing. But why? What exactly is x && foo()?...
Guys I have a couple of questions:   Is there a performance difference in JavaScript between a switch statement and an if...else?    If so why? Is the behavior of switch and if...else different across browsers? (FireFox, IE, Chrome, Opera, Safari)...
I am used to if statements having a condition where ( x < y ) or ( x == y ). But in cases where there is no operator, what does the if statement check exactly? i.e. in the example below if (window.XMLHttpRequest)... what's the condition?  Than...
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?...
the_styles ? the_styles.appendTo('head'); the_styles=null : the_styles = $('.stylesheet').detach();   Obviously, this isn't valid. Notice the ";" between the appendTo() and the_styles=null. How do I write it on 1 line and...
Just started my uni course, struggling a little with javascript. I have been asked to display a square using any character, however, the solution must combine for loops and if statements.   This is what I have so far and I feel pretty close but I jus...
I have 2 different directives. The first one is returns an iframe with a live video, and the second returns an iframe with a recent video.  The condition is: if live content is present, append live directive, else append recent video directive.  Ive...
I asked this question, and it turned out that when removing an attribute from an element, checking whether the element exists first using elem.xxx!==undefined makes the runtime faster. Proof.  Why is it quicker? There's more code to go through an...
I have a scenario where I'm using React.js to create a div using the following code :  React.createElement('div', {}, "div content")    Some additional javascript processing will allow me afterwards to deduce if this div needs to...
I am trying to make a bookmarklet that when clicked will check the URL of the current tab/window to see if it contains 'char1' and/or 'char2' (a given character). If both chars are present it redirects to another URL, for the other tw...

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