JS Array to heavy __JS

Method 1:

function unique1 (array) {
        var newArr = [];
        Traversal array for
        (let key of array) {
            //If key has been saved to a temporary array, skip it, otherwise save it to a temporary array if
            (Newarr.indexof (key) = = 1) {
                Newarr.push (key)
            }
        return
        NEWARR
    }

Method 2:

function Unique2 (array) {
        //n is a hash table, NEWARR is a temporary array
        var n = {},newarr = [];
        For (let key of array) {if
            (!n[key]) {   //If there is no current item in the hash table
                N[key] = true;  Depositing hash table
                Newarr.push (key);  Push the current array item to a temporary array
            } return
        newArr;

    }

Note: cannot distinguish between 1 and ' 1 '

Unique2 ([1,2,4, ' 1 ', 2,4,3,2]   //  [1, 2, 4, 3]

Method 3: Using the Filter method

 function Unique3 (array) {var newArr = Array.filter (function (element, index, self) {
        return Self.indexof (Element) = = = Index});

    return NEWARR; }