# \#217 Contains Duplicate
## *判斷一陣列內是否有重複的元素*
## Log
- build 20210430 by syhuang

## 初見
- map解法, 初見即畢業

var containsDuplicate = function(nums) {
    var map = {};
    for(var n of nums){
        if(typeof(map[n])!='undefined') return true;
        map[n] = n;
    }
    return false;
};

## 備註
- [Set解法與排序解法(效率較差)](https://leetcode.com/problems/contains-duplicate/discuss/60872/1-line-JavaScript-solutions)
## 參考
###### tags: `leetcode`, `leetcode-easy`