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- (function () {
- 'use strict';
- let map = new Map();
- map.set('1', 'str1'); // key: string
- map.set(1, 'num1'); // key: number
- map.set(true, 'bool1'); // key: bool
- // in ordinary objects that would be the same,
- // map retains key type
- console.log( map.get(1) ); // 'num1'
- console.log( map.get('1') ); // 'str1'
- console.log( map.size ); // 3
- })();
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