javascript array last element

1let arr = [1,2,3]
2arr[arr.length - 1] //returns last element in an array

1var foods = ["kiwi","apple","banana"];
2var banana = foods[foods.length - 1]; // Getting last element

1var my_array = /* some array here */;
2var last_element = my_array[my_array.length - 1];

1my_array.slice(-1)[0]
2

1var linkElement = document.getElementById("BackButton");
2var loc_array = document.location.href.split('/');
3var newT = document.createTextNode(unescape(capWords(loc_array[loc_array.length-2]))); 
4linkElement.appendChild(newT);
5

1var lastEle = arr.slice(-1)[0];
2// or
3var lastEle = arr.slice(-1).pop();