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53 lines
1.1 KiB
JavaScript
53 lines
1.1 KiB
JavaScript
// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-array.from
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description: >
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TypeError is thrown if CreateDataProperty fails.
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(items is not iterable)
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info: |
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Array.from ( items [ , mapfn [ , thisArg ] ] )
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[...]
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4. Let usingIterator be ? GetMethod(items, @@iterator).
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5. If usingIterator is not undefined, then
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[...]
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6. NOTE: items is not an Iterable so assume it is an array-like object.
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[...]
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12. Repeat, while k < len
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[...]
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e. Perform ? CreateDataPropertyOrThrow(A, Pk, mappedValue).
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[...]
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CreateDataPropertyOrThrow ( O, P, V )
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[...]
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3. Let success be ? CreateDataProperty(O, P, V).
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4. If success is false, throw a TypeError exception.
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---*/
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var items = {
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length: 1,
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};
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var A1 = function(_length) {
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this.length = 0;
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Object.preventExtensions(this);
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};
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assert.throws(TypeError, function() {
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Array.from.call(A1, items);
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});
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var A2 = function(_length) {
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Object.defineProperty(this, "0", {
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writable: true,
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configurable: false,
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});
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};
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assert.throws(TypeError, function() {
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Array.from.call(A2, items);
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});
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