JSFiddle - React, Tailwind, and code Playground

JavaScript

var loc = {'f096012e-2497-485d-8adb-7ec0b9352c52': ['a','b','c'],
       '44ed0662-1a9e-4c0e-9920-106258dcc3e7': ['d','e','f']};
    
    
// add new last() method:
if (!Array.prototype.last){
    Array.prototype.last = function(){
        return this[this.length - 1];
    };
};
                    
                    
// test it
alert(loc['f096012e-2497-485d-8adb-7ec0b9352c52'].last());