Set (large array)

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Set
const arr = [];
for(let i = 0; i < 1000000; i++) {
	arr.push(i);
	arr.push(0);
}
arr.length === new Set(arr)
ready
Object
const arr = [];
const obj = {};
for(let i = 0; i < 1000000; i++) {
	arr.push(i);
	arr.push(0);
}
for(let num of arr) {
	if(num in obj) break;
	else obj[num] = true;
}
ready

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