> Le 14 févr. 2014 à 21:46, "C. Scott Ananian" <ecmascr...@cscott.net> a écrit :
>
> array-likes with negative length
"Array-likes with negative length" doesn't make sense, or at least it isn't a
useful concept as far as ECMAScript is concerned – as it doesn't make sense to
consider arraylikes of fractional length, or of length equal to the string
`"LOL"`.
If the informal signature of `Array.prototype.copyWithin` is misleading, it
could be rewritten as:
Array.prototype.copyWithin (target, start, end = length of this)
where "length of `obj`" is to be interpreted as `ToLength(obj.length)` – at
least, it is what the algorithm uses in each and every step where the "length"
is expected (the `len` variable in steps 8, 11, 12, 14 and 15).
—Claude
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