19 lines
430 B
JavaScript
19 lines
430 B
JavaScript
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let map = new Map();
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map.set('1', 'first');
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map.set(1, 'second');
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map.set(true, 'third');
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console.log(map.get('1'));
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console.log(map.get(1));
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console.log(map.get(true));
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console.log(map.size);
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// we should use the map.get() method, not map[] so that we can use the feature of the map, ot the map can only get the value from number and string
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let person = {name: 'John'};
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map.set(person, 'hi');
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console.log(map.get(person));
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