On 10.07.2011 14:27, Mike Shaver wrote:
On Sun, Jul 10, 2011 at 6:06 AM, Dmitry A. Soshnikov
<[email protected]> wrote:
The problem:
Array(4).map(function(x) x * x); // [NaN, NaN, NaN, NaN]
I think it actually produces just [ , , , , ], because map skips
holes. (If you see the NaN behaviour in FF, please file a bug.)
Sorry, did I wrote NaN? A "hole" of course (i.e. "nothing"), which is by
[[Get]] is displayed as `undefined` in Firebug, or just as just ,,,,
with toString. Anyway, the issue is in its behavior.
If I hadn't made map skip holes, then the fill pattern would be simple enough:
Array(4).map(function (_,x) x * x);
It's in particular case, you try to multiply indices, which in current
implementation of `map` anyway gives unfortunately nothing.
Dmitry.
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