JSFiddle - React, Tailwind, and code Playground

by Margus Martsepp

JavaScript

var items = [
    {
     "name": "Bananas",
     "slug": "bananas"
    },{
     "name": "Bananas",
     "slug": "bananas"
    },{
     "name": "Silver Spoons",
     "slug": "silver_spoons"
    },{
     "name": "Silver Spoons",
     "slug": "silver_spoons"
    }
]; 
var names = [];
var duplicates = [];
for(var i = 0; i < items.length; i++ ) {
    var value = items[i].name;
    if ($.inArray(value, names) > -1) {
        duplicates.push(i);
    } else {
        names.push(value);
    }
}
alert(names.toString());
alert(duplicates.toString());