2.1.28 [ECMA-262/5] Section 15.4.4.20, Array.prototype.filter ( callbackfn [ , thisArg ] )

V0029:

The specification states:

 NOTE The filter function is intentionally generic; it does not require that its this value be an Array object. Therefore it can be transferred to other kinds of objects for use as a method. Whether the filter function can be applied successfully to a host object is implementation-dependent.

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The filter method can be applied to a host object; however, some host objects may reject such an application.

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