> Le 14 févr. 2014 à 23:40, "C. Scott Ananian" <ecmascr...@cscott.net> a écrit :
>
> Claude Pache wrote:
>> "Array-likes with negative length" doesn't make sense.
>
> `Array.prototype.copyWithin.call({ length: -1 }, ... );`
>
> Call it whatever you like, although I'm always interested in learning
> new phrases of ECMAspeak (if there's an appropriate name for this).
> --scott
Since you are interested: "The abstract operation ToLength converts its
argument to an integer suitable for use as the length of an array-like object."
[1]
It doesn't really matter whether ToLength could extract a reasonable value for
an unreasonable object, or not. But consistency is important: note that this
operation is used whenever the length of an arraylike is expected, not only for
default arguments.
[1] http://people.mozilla.org/~jorendorff/es6-draft.html#sec-tolength
—Claude
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