JSFiddle - React, Tailwind, and code Playground

JavaScript

var arr = [
        {
            title: 'anchorman'
        },
        {
            title: 'happy gilmore'
        },
        {
            title: 'anchorman'
        }
    ];
    
    var temp = {}, newArr = [];
    for(var k =0;k< arr.length; k++){
        if(temp[arr[k].title]){
            newArr.push(arr[k]);
        }
        
    temp[arr[k].title] = true;
    }
console.log(newArr);