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// |reftest| shell-option(--enable-float16array)
// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-%typedarray%.from
description: >
Throws a TypeError if a custom `this` returns a smaller instance
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]
---*/
var sourceItor = [1, 2];
var sourceObj = {
length: 2
};
testWithTypedArrayConstructors(function(TA) {
var ctor = function() {
return new TA(1);
};
assert.throws(TypeError, function() {
TA.from.call(ctor, sourceItor);
}, "source is using iterator");
assert.throws(TypeError, function() {
TA.from.call(ctor, sourceObj);
}, "source is not using iterator");
});
reportCompare(0, 0);
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