2.1.119 [ECMA-262/6] Section 22.2.2.1.1 Runtime Semantics: TypedArrayFrom( constructor, items, mapfn, thisArg )

  • Article

V0087: @@iterator is not supported, so the TypedArray constructors do not accept iterable arguments

The specification states:

 22.2.2.1.1 Runtime Semantics: TypedArrayFrom( constructor, items, mapfn, thisArg )
  
     When the TypedArrayFrom abstract operation is called with arguments constructor, 
     items, mapfn, and thisArg, the following steps are taken:
  
         1.  Let C be constructor.
         ...
         6.  Let usingIterator be GetMethod(items, @@iterator).
         7.  ReturnIfAbrupt(usingIterator).
         8.  If usingIterator is not undefined, then
             a. Let iterator be GetIterator(items, usingIterator).
             b. ReturnIfAbrupt(iterator).
             ...
         9.  Assert: items is not an Iterable so assume it is an array-like object.
         10. Let arrayLike be ToObject(items).
         ...
         18. Return targetObj.

IE11 Mode (All versions)

@@iterator is not supported, so the TypedArray constructors do not accept iterable arguments. Step 10 is reached for every argument.

This affects the following constructors:

    Int8Array

    Uint8Array

    Uint8ClampedArray

    Int16Array

    Uint16Array

    Int32Array

    Uint32Array

    Float32Array

    Float64Array