last index of array js

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

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

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

arr.slice(-1)[0] 

var colors = ["red","blue","green"];
var green = colors[colors.length - 1];//get last

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

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

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

const str = "Users/Edit/12345";
let idx = str.lastIndexOf("/"); // returns 10
idx = str.lastIndexOf("x"); // returns -1

idx = str.lastIndexOf("Edit") // returns 6
idx = str.lastIndexOf("edit") // returns -1 -- case sensitive

// add "from" parameter
// the search happens backwards, starting at the provided from parameter
idx = str.lastIndexOf("s"); // returns 4
idx = str.lastIndexOf("s", 3); // returns 1