Re: Array#lastIndexOf – fromIndex evaluation

Rick Waldron waldron.rick at gmail.com
Sat Nov 3 13:05:26 PDT 2012


Allen can confirm for certain, but I suspect this is a bug, which would get
filed here: https://bugs.ecmascript.org/

Rick


On Sat, Nov 3, 2012 at 3:28 PM, Asen Bozhilov <asen.bozhilov at gmail.com>wrote:

> According to the spec if fromIndex is NaN or undefined the search will
> start from 0. Step 5 of Array.prototype.lastIndexOf performs
> ToInteger(fromIndex).
> This is in contradiction with String.prototype.lastIndexOf, where even if
> I pass a NaN or undefined for position value, the search will start again
> from the end of the string.
> I am wondering what is the intention of that decision, because it seems
> like bug in specification.
> Thank you.
>
>
>
>
>
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