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

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

1var myArray = [1, 2, 3, 4];
2myArray[myArray.length - 1];

1let arr = ['a', 'b', 'c']
2arr.slice(-1)[0] // returns last element in an array

1last element of array

1var lastElement = myList[myList.length - 1];
2console.log(lastElement);