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33 lines
1.0 KiB
JavaScript
33 lines
1.0 KiB
JavaScript
// Copyright (C) 2015 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: 23.1.1.1
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description: >
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Returns the new Map object with the new empty list if the iterable argument is
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undefined.
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info: >
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Map ( [ iterable ] )
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...
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2. Let map be OrdinaryCreateFromConstructor(NewTarget, "%MapPrototype%",
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«[[MapData]]» ).
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...
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4. Map map’s [[MapData]] internal slot to a new empty List.
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5. If iterable is not present, let iterable be undefined.
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6. If iterable is either undefined or null, let iter be undefined.
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...
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8. If iter is undefined, return map.
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---*/
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var m1 = new Map();
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var m2 = new Map(undefined);
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var m3 = new Map(null);
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assert.sameValue(m1.size, 0, 'The value of `new Map().size` is `0`');
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assert.sameValue(m2.size, 0, 'The value of `new Map(undefined).size` is `0`');
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assert.sameValue(m3.size, 0, 'The value of `new Map(null).size` is `0`');
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assert(m1 instanceof Map);
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assert(m2 instanceof Map);
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assert(m3 instanceof Map);
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