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const array = [1,2,3,4,4];
function findDuplicate(inArr) {
inArr.reduce((sum, entity, idx) => {
sum[entity] = true;
if (Object.keys(sum).length != idx+1) {
throw `Duplicate found at index ${idx} in value ${entity}`;
}
return sum;
}, {});
}
findDuplicate(array);
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