JSFiddle - React, Tailwind, and code Playground

JavaScript

var array=["hello","hello","world",1,"world"];

function removeDups(items) {
    var i,
        setObj = {},
        setArray = [];
    for (i = 0; i < items.length; i += 1) {
        if (!setObj.hasOwnProperty(items[i])) {
            setArray.push(items[i]);
            setObj[items[i]] = true;
        }
    }
    return setArray;
}

console.log(removeDups(array));