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25 lines
927 B
JavaScript
25 lines
927 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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esid: sec-symbol.for
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description: Creation of a unique Symbol value
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info: |
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1. Let stringKey be ? ToString(key).
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2. For each element e of the GlobalSymbolRegistry List,
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a. If SameValue(e.[[Key]], stringKey) is true, return e.[[Symbol]].
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3. Assert: GlobalSymbolRegistry does not currently contain an entry for
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stringKey.
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4. Let newSymbol be a new unique Symbol value whose [[Description]] value
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is stringKey.
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5. Append the Record { [[Key]]: stringKey, [[Symbol]]: newSymbol } to the
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GlobalSymbolRegistry List.
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6. Return newSymbol.
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features: [Symbol]
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---*/
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var canonical = Symbol.for('s');
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assert.sameValue(typeof canonical, 'symbol');
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assert.notSameValue(canonical, Symbol('s'));
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assert.notSameValue(canonical, Symbol.for('y'));
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