javascript last element of array

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

1var colors = ["red","blue","green"];
2var green = colors[colors.length - 1];//get last item in the array

1const heroes = ["Batman", "Superman", "Hulk"];
2const lastHero = heroes.pop(); // Returns last elment of the Array
3// lastHero = "Hulk"

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

1arr.slice(-1)[0] 

1var last = arr.slice(-1)[0]