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// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 22.2.2.1
esid: sec-%typedarray%.from
description: >
Custom constructor can return any TypedArray instance with higher or same
length
info: |
%TypedArray%.from ( source [ , mapfn [ , thisArg ] ] )
...
7. If usingIterator is not undefined, then
a. Let values be ? IterableToList(source, usingIterator).
b. Let len be the number of elements in values.
c. Let targetObj be ? TypedArrayCreate(C, «len»).
...
10. Let len be ? ToLength(? Get(arrayLike, "length")).
11. Let targetObj be ? TypedArrayCreate(C, « len »).
...
includes: [testTypedArray.js]
features: [Symbol.iterator, TypedArray]
---*/
testWithTypedArrayConstructors(function(TA, N) {
var sourceItor = N([1, 2]);
var sourceObj = {
0: N(0),
1: N(0),
length: 2
};
var result;
var custom = new TA(2);
var ctor = function() {
return custom;
};
result = TypedArray.from.call(ctor, sourceItor);
assert.sameValue(result, custom, "using iterator, same length");
result = TypedArray.from.call(ctor, sourceObj);
assert.sameValue(result, custom, "not using iterator, same length");
custom = new TA(3);
result = TypedArray.from.call(ctor, sourceItor);
assert.sameValue(result, custom, "using iterator, higher length");
result = TypedArray.from.call(ctor, sourceObj);
assert.sameValue(result, custom, "not using iterator, higher length");
});
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