15.3.4.3 Function.prototype.apply (thisArg, argArray)

Jose Antonio Perez joseanpg at gmail.com
Thu Oct 28 10:45:53 PDT 2010


>
> If we assume “Array like object” is an object that can serve as the this
> value of the Array.prototype methods then pretty much any object  is “Array
> like”.  The Array.prototype methods generally iterate based upon the value
> of the this object’s length property. They use ToUint32  to interpret length
> as a positive value in the 0..2^32-1 range.  If the this object does not
> have a length property, [[Get]] will return undefined which ToUint32
> converts to 0.  All other non-numeric values  also convert to values in the
> 0..2^32-1 range.
>

>
> So objects without a length or with a length value for which ToNumber
> produces NaN are treated as 0 length “arrays”.
>
>
>

Actually we are discussing two possible positions:
- Any object is an Array-like-object
- An Array-like-object  is an object that has a integer length property that
in interval [0,2^32)
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