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217. Contains Duplicate
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contains-duplicate/y00eunji.js

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/**
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* @param {number[]} nums
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* @return {boolean}
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*/
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var containsDuplicate = function(nums) {
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// set에 넣어 중복을 줄이고 길이를 비교한다.
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return new Set(nums).size !== nums.length;
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};

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