ecmascript-5

I am looking for a shim for the ECMAScript Internationalization API . Does anyone know of such a project? (Even if it's still currently a work-in-progress.) Andy E Yes, there's a polyfill for ECMA-402 (aka ECMA Internationalization API Specification) available at https://github.com/andyearnshaw/Intl.js . For use in Node.js applications, you can install with NPM: npm install intl It's also available as a Bower component for the front-end: bower install intl There's support for NumberFormat and DateTimeFormat , but no support for Collator . Currently, for client-side browser environments, you

Is there a tool out there to scan my Javascript code for functions that may not be present in all browsers? My library is completely non-UI, so I don't care about how something is "displayed". What I'm looking for is something like in the Javascript MDN from Mozilla. For example, for Array.prototype.indexOf, they warn that it's a recent ECMAScript addition that is not present in all browsers (and typically provide a stub). What I'm looking for is a tool that'd list the functions in my code that would fall into this category. You can use eslint-plugin-compat , a plugin for the ESlint linting

ECMAScript Fifth Edition (released December 2009) introduces a bunch of new methods (see this table for details). However, there still are older browsers out there which do not implement those new methods. Luckily, there exists a convenient script (written in JavaScript) - ES5-shim - which implements those methods manually in environments where they don't exist. However, I am not sure how to provide ES5-shim... Should I just "give" it to all browsers, like so: <script src="es5-shim.js"></scipt> Or should I include a check in order to only "bother" those browsers which really need it, like so:

this page states: Note: isPrototypeOf differs from instanceof operator. In the expression object instanceof AFunction, the object prototype chain is checked against AFunction.prototype, not against AFunction itself Ok I don't really get what they are trying to tell us. Isn't object instanceof AFunction exactly the same as `AFunction.prototype.isPrototypeOf(object)? or am I wrong? Why do we need the isPrototypeOf at all? If i ever need to do p.isPrototypeOf(o) couldn't I just do o instanceof p.constructor ? Addtionally, is p.isPrototypeOf(o) functionally equivalent to p===Object.getPrototypeOf

I was reading a book about learning JavaScript, and there was these paragraphs: ...in middle of 1997, Microsoft and Netscape, with associate of European Computer Manufactures Association, released the first version of a standard that named ECMAScript or with official form ECMA-262 ... As much as I was found in this book and something like this, JavaScript and ECMAScript are the same and are different just in name. From other hand, in Dreamweaver, bracket, and some other editors, there's some autocomplete suggestion like this: when I want to add a script tag to my page. I want to know if there

What is the difference between a shim an a sham? Is it enough to include es5-shim.min.js and es6-shim.min.js or should I also include es5-sham.min.js and es6-sham.min.js? According to this Github page the shims include all monkey-patches that faithfully represent the ES5 features. In other words: you can use the features provided by these files as if you were using ES5 proper. The shams, however contain those features that can not be emulated with other code. They basically provide the API, so your code doesn't crash but they don't provide the actual functionality. Which ones do you need? That

When I reduce the array, I am trying to get the number zero, but I dont clearly understand the behaviour of the function [].reduce(function(previousValue, currentValue){ return Number(previousValue) + Number(currentValue); }); result TypeError: Reduce of empty array with no initial value seems that if the array is empty I can't reduce it [""].reduce(function(previousValue, currentValue){ return Number(previousValue) + Number(currentValue); }); result "" If the only element in the array is an empty string, retrieves an empty string xdazz The second parameter is for initial value. [].reduce

I wanted to do something which is very straight-forward using Object.assign . var firstObj = {name : "Saba H.", rollNo : 1}; var secondObj = {college : "WCE"}; var wholeObj = Object.assign(firstObj, secondObj); console.log(wholeObj); // {name : "Saba H.", rollNo : 1, college : "WCE"} As Object.assign is part of ECMAScript6 harmony proposal and not supported across many browsers, is it possible to do with ES5? If not then is there any micro library? In underscore.js you can use like, _.extend(firstObj, secondObj); In jQuery, you can use, $.extend({},firstObj,secondObj); In pure javascipt, you