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Create 136-single-number.js
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136-single-number.js

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/**
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* @param {number[]} nums
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* @return {number}
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*/
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const singleNumber = function(nums) {
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let xor = nums[0]
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for(let i = 1; i< nums.length; i++) xor ^= nums[i]
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return xor
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};

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