Remove duplicates from Array

remove-duplicates.js

const arr = [6, 8, 10, 2, 5, 6, 13, 11, 8, 0, 11, 11, 3, 5, 100, 100, 78];

Array.prototype.removeDuplicates = function () {

    let arr = this;

    // Sort array first
    arr.sort(function(a, b) {
        return a - b;
    });

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

        let pivot = arr[x];
        let counter = x + 1;

        if (pivot !== arr[counter]) {
            continue;
        } else {
            do {
                arr.splice(counter, 1);
            } while (pivot === arr[counter]);
        }
    }

    return arr;
};


console.time('removeDuplicates');
arr.removeDuplicates();
console.timeEnd('removeDuplicates');