Array of duplicate elements remove buy using dictionaries?

Question

**by using only dictionaries to remove duplicate elements in array.

Answer 1

let x = [1,2,3,1,2]

let arr2= {}

for(let i = 0; i <x.length;i++){

    arr2 = Object.assign(arr2, {
        [x[i]]: x[i]
    })
}

console.log(Object.keys(arr2))