Rick Waldron wrote: > > On Tue, Jan 3, 2012 at 9:19 AM, Mariusz Nowak < > [email protected]> wrote: > >> >> >> Rick Waldron wrote: >> > >> > On Tue, Jan 3, 2012 at 3:34 AM, Mariusz Nowak < >> > [email protected]> wrote: >> > >> >> >> >> >> >> Rick Waldron wrote: >> >> > >> >> > On Mon, Jan 2, 2012 at 3:56 PM, Mariusz Nowak < >> >> > [email protected]> wrote: >> >> > >> >> >> >> >> >> I like it, it indeed looks very logical, however it's a bit >> >> controversial >> >> >> that we need to create temporary array object to get one that we >> want. >> >> >> >> >> > >> >> > Is the controversy editorial or fact, because the following methods >> are >> >> > all >> >> > specified to use a temporary, newly initialized Array internally: >> >> > >> >> > Array.prototype.concat >> >> > Array.prototype.filter (...) >> >> > >> >> >> >> Rick, you say that apart of output arrays this methods create some >> other >> >> temporary arrays internally ? >> >> I don't see anything like that in specification, where exactly is it >> >> stated >> >> ? >> >> >> > >> > >> > Array.prototype.concat >> > - http://es5.github.com/#x15.4.4.4 #2 >> > >> > Array.prototype.filter >> > - http://es5.github.com/#x15.4.4.20 #6 >> > >> > (...) >> > >> >> Rick, those arrays become result of each method, they're not temporary. >> > > Sorry, I should've been clearer... I was responding to your statement that > implied Axel's example code was somehow creating an unnecessary temporary > array - have I missed something here? > >
Rick, what I meant is that it implies creation of temporary array object. Let's say I want to have an array made of numbers 1,2,3 repeated three times. To get it I need to create temporary [1, 2, 3] array which I don't really need: result = [1, 2, 3].repeat(3); It'll be more clean if it will work directly on context array: var x = [1, 2, 3]; x.repeat(2); console.log(x); // [1, 2, 3, 1, 2, 3]; but that probably won't be expected behavior by most developers. Anyway as Greg pointed, it's hard to find a valid use case for any array repeating method, it conceptually may look as nice add-on, but I'm not sure if it would be that useful to have it in standard. -- Mariusz Nowak https://github.com/medikoo/ ----- Mariusz Nowak https://github.com/medikoo -- View this message in context: http://old.nabble.com/Suggestion%3A-Array.prototype.repeat-tp33067649p33072532.html Sent from the Mozilla - ECMAScript 4 discussion mailing list archive at Nabble.com. _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
