JSFiddle - React, Tailwind, and code Playground

JavaScript

var arr = [144448208, 27677788, 783779, 144448208];
arr = arr.sort(function(A, B) {return A - B;});

var newArr = [];

for (var i = 0; i < arr.length; i++) {
  if (i > 0 && arr[i - 1] == arr[i]) continue;
  
  newArr.push(arr[i]);
}

alert(newArr);