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                            # 字典 map
* 與集合類似，也是儲存唯一值的數據結構，但是以key/value的形式
* 字典的常用操作：健值對的增刪查改
* map和對象的區別：
    * 在js中map和對象是非常像的，都是采用鍵值對的數據結構。
    * 它們不同點是它們的key值。對象的key值只允許是字符串，而map的key值可以是字符串、數字、對象等各種類型。

![](https://img.kancloud.cn/45/4b/454b03e387797a39c4a4d8989a57fd13_509x173.png)

[無重復字符的最長子串]([https://leetcode-cn.com/problems/longest-substring-without-repeating-characters/](https://leetcode-cn.com/problems/longest-substring-without-repeating-characters/))

![](https://img.kancloud.cn/c8/93/c8939474a09709a24f9505c145d28bb5_778x453.png)
[最小覆蓋子串](https://leetcode-cn.com/problems/minimum-window-substring/)

![](https://img.kancloud.cn/97/a3/97a3deeb1263681c573fcd0919ece63b_846x262.png)
![](https://img.kancloud.cn/e2/ec/e2ecc37433bfa602aab5b86241cef8c6_1034x814.png)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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