JAVASCRIPT

how to put a element in the last index of an array javascript

arr.push(Element)

get last index of array

const arr = [2, 4, 6, 8, 10, 12, 14, 16];

const lastElement1 = arr[arr.length - 1];  // Method 1
const lastElement2 = arr.slice(-1);  //Method 2
const lastElement3 = arr.pop(); //Method 3
const lastElement4 = arr.at(-1) //Method 4 Best Approach

last index of javascript

var str = "Please locate where 'locate' occurs!";

var ind1 = str.indexOf("locate"); // return location of first value which founded
var ind2 = str.lastIndexOf("locate"); // return location of last value which founded
var ind3 = str.indexOf("locate", 15); // start search from location 15 and then take first value which founded
var ind4 = str.search("locate");
//The search() method cannot take a second start position argument. 
//The indexOf() method cannot take powerful search values (regular expressions).

document.write("<br>" + "Length of string:", len);
document.write("<br>" + "indexOf:", ind1);
document.write("<br>" + "index of last:", ind2);
document.write("<br>" + "indexOf with start point:", ind3);
document.write("<br>" + "search:", ind4);

what is last index of array

const indices = [];
const array = ['a', 'b', 'a', 'c', 'a', 'd'];
const element = 'a';
let idx = array.lastIndexOf(element);
while (idx !== -1) {
  indices.push(idx);
  idx = (idx > 0 ? array.lastIndexOf(element, idx - 1) : -1);
}

console.log(indices);
// [4, 2, 0]

how to get last index of array in javascript

const lastElement = arrayName[arrayName.length - 1];

JavaScript Array lastIndexOf()

const fruits = ["Apple", "Orange", "Apple", "Mango"];
let position = fruits.lastIndexOf("Apple") + 1;

how to get last index of array in javascript

last array index

last position of array javascript

arr.slice(-1).pop()