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23 lines
700 B
JavaScript
23 lines
700 B
JavaScript
// Copyright (C) 2016 the V8 project authors. 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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es6id: 21.1.1
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description: Subclassing the String object
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info: |
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21.1.1 The String Constructor
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...
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The String constructor is designed to be subclassable. It may be used as the
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value of an extends clause of a class definition. Subclass constructors that
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intend to inherit the specified String behaviour must include a super call to
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the String constructor to create and initialize the subclass instance with a
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[[StringData]] internal slot.
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---*/
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class S extends String {}
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var s = new S(' test262 ');
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assert.sameValue(s.trim(), 'test262');
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