Why was the arguments.callee.caller property deprecated in JavaScript? It was added and then deprecated in JavaScript, but it was omitted altogether by ECMAScript. Some browser (Mozilla, IE) have always supported it and don't have any plans on the map to remove support. Others (Safari, Opera) have adopted support for it, but support o...
Hello Javascript experts Today I had a discussion with a colleague about nested functions in Javascript: function a() { function b() { alert('boo') } var c = 'Bound to local call object.' d = 'Bound to global object.' } In this example, trials point out that b is not reachable outside the body of a, much like c is. ...
From http://www.jibbering.com/faq/faq_notes/closures.html : Note: ECMAScript defines an internal [[prototype]] property of the internal Object type. This property is not directly accessible with scripts, but it is the chain of objects referred to with the internal [[prototype]] property that is used in property accessor resolution; t...
EcmaScript Fifth Edition, or Ecma-262, has been announced and contains some changes to the language. What features in the new version are going to help you write better code? ...
I am looking for an ECMAScript alternative to work as a scripting language for custom application logic. There are things I like about ECMA, especially the syntax for the newer spec(like AS3). Unfortunately, the AS3 engine is not open source to be able to integrate in a project. I would like a scripting language that was designed for ...
I was just reading John Resig's ECMAScript 5 post. From what I can work out, ECMAScript is the standard and JavaScript is the implementation. Is this correct? ...
Does anyone know of real (i.. no vaporware) implementations of ECMAScript targeting the .NET CLR/DLR? Ideally something like what Rhino is for Java. A solid port of Rhino running on .NET Framework / Mono Framework would be perfect. I've only seen a handful of projects mentioned but never seen any come to light or in reality anything tha...
I have a CustomValidator that is validating a telephone number for several different telephone numbering schemes. The client-side javascript looks like this: validatePhoneNumber(sender, args) { cleanNumber = args.Value.replace(/\D/, ""); country = $("#" + CountryID).get(0).value; switch (country) { case "North Americ...
Any idea why JSON left out NaN and +/- Infinity? It puts Javascript in the strange situation where objects that would otherwise be serializable, are not, if they contain NaN or +/- infinity values. Looks like this has been cast in stone: see RFC4627 and ECMA-262 at the top of p. 197: Finite numbers are stringified as if by String(...
ECMAScript 5 is in its final draft as I write this; It is due to include a strict mode which will prevent you from assigning to the global object, using eval, and other restrictions. (John Resig's Article is a good introduction.) This magical sanity-saving mode is triggered by including the string "use strict" at the top of your file (o...
I have a book, Essential ActionScript 3 (O'Reilly), to learn about using that language. It mentions that ActionScript 3 is an implementation of ECMAScript, just like Javascript. I find this strange, because there are many differences. In Javascript, as far as I know, you cannot give variables a type (var marvin : Robot) or create "tradit...
I read both of the links below http://en.wikipedia.org/wiki/ECMAScript http://stackoverflow.com/questions/912479/what-is-the-difference-between-javascript-and-ecmascript My question is, does ECMAScript exist as something I can download and use instead of JavaScript? ...
I tried to search for a JavaScript reference, but there's none available. The best two suggested sources are MDC and W3Schools. Why? ...
Implementing the ScriptControlClass was extremely easy, unfortunately the side effects with the language implementation is really starting to worry me. The goal was to have a language that was the same as the browser's JavaScript. However, I am finding a difference in case sensitivity, function declarations and behavior of scoping bet...
Firefox 3.5.3 (at least) allows me to write code like : var array = [4, 5, 6]; var foo, bar, baz; [foo, bar, baz] = array; at which point foo => 4 bar => 5 baz => 6 which can be quite helpful for code clarity. Is that considered ECMAScript-compliant? I didn't see anything in the specification, but JSLint returns an error. ...
I'm trying to find a good EBNF description of ECMAScript, but so far I've not found anything complete. Any ideas? ...
I am attempting to get a basic ECMAScript parser working, and found a complete ANTLR grammar for ECMAScript 3, which appears to compile ok and produces the appropriate Lexer/Parser/Walker Java files. (Running inside ANTLR IDE plugin for Eclipse 3.5) However, when actually trying to use it with some simple test code (following guide on A...
Does anybody know why, at the end of section 7.6 of the ECMA-262, 5th Edition specification, the nonterminals UnicodeLetter, UnicodeCombiningMark, UnicodeDigit, UnicodeconnectorPunctuation, and UnicodeEscapeSequence are not followed by two colons? From section 5.1.6: Nonterminal symbols are shown in italic type. The definition of ...
The question says it all. ...
The Date constructor in JavaScript/ECMAScript/JScript allows passing the number of milliseconds since midnight, 1/1/1970. Nowhere can I find documentation whether this is midnight in the client machine's timezone, or midnight GMT. Which is it? Can it be relied on between different browsers and versions? Is this officially documented a...