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];

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

1// Find the last item in an array.
2arrayName[arrayName.length - 1]

1const array = ['a', 's', 'd', 'f'];
2const last = array.pop(); 
3console.log(last); // Returns 'f'
4console.log(array); // Returns ['a', 's', 'd']