23 lines
510 B
JavaScript
23 lines
510 B
JavaScript
var map = new Map(),
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fn = function () {},
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obj = {};
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map.set(fn, 123);
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map.set(obj, 'abc');
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map.set('key', 'val');
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map.set(3, x => x + x);
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map.get(fn); //=> 123
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map.get(function () {}); //=> undefined because not the same function
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map.get(obj); //=> 'abc'
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map.get({}); //=> undefined because not the same object
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map.get('key'); //=> 'val'
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map.get(3); //=> (x => x + x)
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map.size; //=> 4
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//iterating using ES6 for..of syntax
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for (var key of map.keys()) {
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console.log(key + ' => ' + map.get(key));
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}
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