On Tue, Oct 7, 2014 at 2:35 PM, Tab Atkins Jr. <jackalm...@gmail.com> wrote:
> On Tue, Oct 7, 2014 at 2:26 PM, Dmitry Soshnikov > <dmitry.soshni...@gmail.com> wrote: > > I see. Actually it doesn't work, your're correct, since > > `Array.prototype.map` does preserve the kind (at least in the latest > draft). > > Hmm, per Rick's earlier email and > < > https://github.com/rwaldron/tc39-notes/blob/c61f48cea5f2339a1ec65ca89827c8cff170779b/es6/2013-01/jan-30.md#revising-the-array-subclassing-kind-issue > >, > Array#map (used by a subclass) doesn't preserve the subclass's type; > it always returns an Array. > > > And the `UInt32Array.from(...)` would be consuming a nodeList, not an > array. > > Will the `nodeList.map(node => parseInt(node.value, 10));` by itself > > actually work then? > > If .map() is inherited from Array, and thus not type-preserving, yes, > it'll work. > > Yes, it is preserving (probably was changed since that previous discussion), see (9) in http://people.mozilla.org/~jorendorff/es6-draft.html#sec-array.prototype.map. Will a simple map to `node.value` on a `NodeList` work with the preserving `Array#map`? Dmitry
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