javascript-engine

My question is related to how the JS engines implement the pattern of asynchronous events when we do something like bind event handlers on a dom for lets say a click event.? Do they have something like a separate thread that is listening to all the click events ? When an event does occur , do they refer the bind list and bubble up the events ? Similar is with Ajax,the asynchronous network call, where the browser spans a new thread that would start listening to the data from the server and when the response is received, it would call the success handler? jfriend00 Read this post about the

Edit In consideration of the answer response below regarding the reference ECMAScript Language Specification - 11.13.2 Compound Assignment Considering why these, javascript: o=""; o = o + (o+=1) ; alert(o); o=""; o = (o+=1) + o; alert(o); are NOT the same. There are temporal semantic issues with left to right script evaluation (ref: ECMA spec. - The addition operator ). One consequence is that the + operator is not necessarily commutative. This can also be seen by with: javascript: o=1; o = o + (o+=1) ; alert(o); o=1; o = (o+=1) + o; alert(o); or javascript: o=" _ "; o = o + (o+=1) ; alert(o);

Question not for solution, Question to understand the system better Experts! I know whenever you feed javascript code into javascript engine, It will execute by javascript engine immediately. Since, I haven't seen Engine's source code, I have few of questions as follows, Let us assume I am loading couple of files from remote server namely FILE_1.js and FILE_2.js. And the code in FILE_2.js is requiring some of the code in FILE_1.js. So I have included files as follows, <script type="text/javascript" src="FILE_1.js" ></script> <script type="text/javascript" src="FILE_2.js" ></script> So

I'm looking for an open source javascript engine for .NET. Thanks. You can check Jint which is a Javascript interpreter for .NET. Try Javascript .NET: http://javascriptdotnet.codeplex.com/ It implements Google V8. You can compile and run Javascript directly from .NET code with it, and supply CLI objects to be used by the Javascript code as well. And V8 is probably the best engine ever created in terms of performance, it generates native code from Javascript. There was, at one time, a clone of JavaScript that ran on the DLR . But now it's dead . A quick search turns up RemObjects Script and

Is a boolean stored as a 32-byte integer in memory? How about a null value? In the book Speaking Javascript , it refers to a type tag being used to indicate the type of a value stored in memory. e.g. The type tag for Object type was 000. What is a type tag? How would I find the type tag of a value type such as a boolean or string ? From Andy Wingo's blog post on the topic: Initially, all JavaScript implementations used tagged pointers to represent JS values. This is a old trick that comes from the observation that allocated memory takes up at least 4 or 8 bytes, and are aligned in such a way

Take the following code example: var myObject = {}; var i = 100; while (i--) { myObject["foo"+i] = new Foo(i); } console.log(myObject["foo42"].bar()); I have a few questions. What kind of data structure do the major engines (IE, Mozilla, Chrome, Safari) use for storing key-value pairs? I'd hope it's some kind Binary Search tree, but I think they may use linked lists (due to the fact iterating is done in insertion order). If they do use a search tree, is it self balancing? Because the above code with a conventional search tree will create an unbalanced tree, causing worst case scenario of O(n)