The following are two methods of building a link that has the sole purpose of running JavaScript code. Which is better, in terms of functionality, page load speed, validation purposes, etc.?    function myJsFunc() {     alert("myJsFunc"); }...
What is the difference between using call and apply to invoke a function?  var func = function() {   alert('hello!'); };   func.apply(); vs func.call();  Are there performance differences between the two aforementioned methods? When is it b...
I'm writing a Chrome extension that involves doing a lot of the following job: sanitizing strings that might contain HTML tags, by converting <, > and & to &lt;, &gt; and &amp;, respectively.  (In other words, the same as...
What kinds of activities will trigger reflow of web page with DOM?  It seems there are different points of view. According to http://www.nczonline.net/blog/2009/02/03/speed-up-your-javascript-part-4/,  it happens   When you add or remove a DOM node...
How do parseInt() and Number() behave differently when converting strings to numbers?...
From the MDN docs for the standard setPrototypeOf function  as well as the non-standard  __proto__ property:     Mutating the [[Prototype]] of an object, no matter how this is accomplished, is strongly discouraged, because it is very slow and unavo...
I ran this code and got the below result. I curious to know why [] is faster?  console.time('using[]') for(var i=0; i<200000; i++){var arr = []}; console.timeEnd('using[]')  console.time('using new') for(var i=0; i<200...
I learned from books that you should write for loop like this?  for(var i=0, len=arr.length; i < len; i++){     // blah blah }   so the arr.length will not be calculated each time.    Others say that the compiler will do some optimization to thi...
Is there a good profiler for javascript? I know that firebug has some support for profiling code. But I want to determine stats on a longer scale.  Imagine you are building a lot of javascript code and you want to determine what are actually the bot...
I have a model with possibly thousands of objects. I was wondering what would be the most efficient way of storing them and retrieving a single object once I have it's id. The id's are long numbers.  So these are the 2 options I was thinkin...

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