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38 lines
1.4 KiB
JavaScript
38 lines
1.4 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-object.getownpropertydescriptor
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description: >
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String primitive as first argument is coerced to object.
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info: |
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Object.getOwnPropertyDescriptor ( O, P )
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1. Let obj be ? ToObject(O).
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[...]
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3. Let desc be ? obj.[[GetOwnProperty]](key).
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4. Return FromPropertyDescriptor(desc).
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String Exotic Objects
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String exotic objects always have a data property named "length" whose value is the number
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of code unit elements in the encapsulated String value. Both the code unit data properties
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and the "length" property are non-writable and non-configurable.
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---*/
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assert.sameValue(Object.getOwnPropertyDescriptor('', '0'), undefined);
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var indexDesc = Object.getOwnPropertyDescriptor('foo', '0');
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assert.sameValue(indexDesc.value, 'f', '[[Value]]');
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assert.sameValue(indexDesc.writable, false, '[[Writable]]');
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assert.sameValue(indexDesc.enumerable, true, '[[Enumerable]]');
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assert.sameValue(indexDesc.configurable, false, '[[Configurable]]');
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var lengthDesc = Object.getOwnPropertyDescriptor('foo', 'length');
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assert.sameValue(lengthDesc.value, 3, '[[Value]]');
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assert.sameValue(lengthDesc.writable, false, '[[Writable]]');
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assert.sameValue(lengthDesc.enumerable, false, '[[Enumerable]]');
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assert.sameValue(lengthDesc.configurable, false, '[[Configurable]]');
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