Le 01/12/2011 08:47, Andrea Giammarchi a écrit : > Let's say this is an attempt to bring some new, easy to implement, > method for the native Object.prototype > Specially about forEach, the most used Array.prototype method out there, That's quite an ambitious statement. I use forEach, but I think I use push, concat, every/some, map and reduce quite often as well and I wouldn't be able to tell which I use more often (probably push).
> it's quite clear JS developers would like to have similar method to > iterate over objects, as key:value pairs rather than index:value. It seems that iterators [1] could do what you need. In this proposal (so very likely to be in ES.next), you can see this example: ----- for ([key, val] of items(x)) { alert("x." + key + " = " + val); } ----- There is even the possibility for you to define your own iterator on your objects. > Almost every framework/library out there has an "error prone" > each(obj, callback) method, able to automagically recognize if the > passed obj is an array, an arrayLike, or an object. > A classic failing scenario is a function used as object, where the > length property won't mean it's an arrayLike entity. If some library authors think that an array is an object with a 'length' property, I think that they should learn JavaScript and that is not a reason to add a language feature. David [1] http://wiki.ecmascript.org/doku.php?id=harmony:iterators _______________________________________________ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss