get last index js code example

Example 1: get last element of array javascript

// Method - 1 ([] operator)
const arr = [5, 3, 2, 7, 8];
const last = arr[arr.length - 1];
console.log(last);
/*
    Output: 8
*/

// Method - 2 (Destructuring Assignment)
const arr = [5, 3, 2, 7, 8];

const [last] = arr.slice(-1);
console.log(last);
/*
    Output: 8
*/

// Method - 3 (Array.prototype.pop())
const arr = [5, 3, 2, 7, 8];

const last = arr.slice(-1).pop();
console.log(last);
/*
    Output: 8
*/

// Method - 4 (Underscore/Lodash Library)
const _ = require("underscore");

const arr = [5, 3, 2, 7, 8];
const last = _.last(arr);
console.log(last);
/*
    Output: 8
*/

Example 2: Javascript get last item in array

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

Example 3: get last element of array javascript

var numbers = ["one", "two", "three"];
var lastnumber = numbers[numbers.length - 1];
console.log(lastnumber);

Example 4: js last index of

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