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19 lines
656 B
JavaScript
19 lines
656 B
JavaScript
// Copyright (C) 2013 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: 19.4
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description: >
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Symbol as Map key
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features: [Symbol]
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---*/
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var map = new Map();
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var sym = Symbol();
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map.set(sym, 1);
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assert.sameValue(map.size, 1, "The value of `map.size` is `1`, after executing `map.set(sym, 1)`");
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assert.sameValue(map.has(sym), true, "`map.has(sym)` returns `true`");
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assert.sameValue(map.get(sym), 1, "`map.get(sym)` returns `1`");
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assert.sameValue(map.delete(sym), true, "`map.delete(sym)` returns `true`");
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assert.sameValue(map.size, 0, "The value of `map.size` is `0`");
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