数组-数组中重复的数字
数组中重复的数字
http://www.nowcoder.com/questionTerminal/623a5ac0ea5b4e5f95552655361ae0a8
function duplicate(numbers, duplication = {}) {
let result = {};
for (let i of numbers) {
if (result[i]) {
duplication[0] = i;
return true;
} else {
result[i] = 1;
duplication[0] = -1;
}
}
return false;
} 
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