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var singleNumber = function (nums) {
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  let s = 0; // Location of first possible suspect
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  for (let i = s + 1; i < nums.length; i++) {
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    if (nums[i] == nums[s]) {
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      // If we found a duplicate
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      nums.splice(i, 1); // Remove duplicate so it won't confuse us next time we come across it
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      s++; // Next suspect's location
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      i = s; // Start of next search (i=s+1 in next loop iteration)
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    }
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  }
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  return nums[s];
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};