JavaScript array package deduplication function

JavaScript data deduplication wrapper function as follows:

 var arr=[1,2,3,1,2];
function Distinct(arr) {
        let map = new Map()
        let newArr = []
        for(let i = 0; i < arr.length; i++) {
            if(!map.has(arr[i])) {
                map.set(arr[i])
                newArr.push(arr[i])
            }
        }
        return newArr
    }
console.log(arr) //123

　　

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