162. find the single integer

JavaScriptAlgorithm
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easy  - accepted / - tried

Given an array of integers, all integers appear twice except one integer, could you quickly target it ?

const arr = [10, 2, 2 , 1, 0, 0, 10]
findSingle(arr) // 1

What is time & space cost of your approach ? Could you do better ?

Let's try to solve this problem within 10 mintues.

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