打卡12.7，找单独的数 - 栋梁之才 - 沸点 - 掘金

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#刷题交流# 打卡12.7，找单独的数
```
function solution(cards) {
// Edit your code here
cards.sort()
for (let i = 0; i < cards.length; i += 2) {
if (cards[i] != cards[i + 1])
return cards[i]
}
return 'null';
}

function main() {
// Add your test cases here
console.log(solution([1, 1, 2, 2, 3, 3, 4, 5, 5]) === 4);
console.log(solution([0, 1, 0, 1, 2]) === 2);
}

main();
```

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