javascript
Remove duplicates from an array and return unique values in O(n) complexity
let arr = [1, 2, 3, 4, 3, 7, 6, 5, 4];
function unique(arr) {
let items = {};
arr.forEach((item) => {
if (!items[item]) {
items[item] = item;
}
});
return items;
}
console.log(Object.values(unique(arr)));Output
[1,2,3,4,5,6,7]
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