How to append something to an array?

Answer 1

We don't have append function for Array in javascript, but we have push and unshift, imagine you have the array below:

var arr = [1, 2, 3, 4, 5];

and we like append a value to this array, we can do, arr.push(6) and it will add 6 to the end of the array:

arr.push(6); // return [1, 2, 3, 4, 5, 6];

also we can use unshift, look at how we can apply this:

arr.unshift(0); //return [0, 1, 2, 3, 4, 5];

They are main functions to add or append new values to the arrays.

Answer 2

With the new ES6 spread operator, joining two arrays using push becomes even easier:

var arr = [1, 2, 3, 4, 5];
var arr2 = [6, 7, 8, 9, 10];
arr.push(...arr2);
console.log(arr);

This adds the contents of arr2 onto the end of arr.

Babel REPL Example

Answer 3

If you want to append two arrays -

var a = ['a', 'b'];
var b = ['c', 'd'];

then you could use:

var c = a.concat(b);

And if you want to add record g to array (var a=[]) then you could use:

a.push('g');

Answer 4

Just want to add a snippet for non-destructive addition of an element.

var newArr = oldArr.concat([newEl]);

Answer 5

Appending items on an array

let fruits =["orange","banana","apple","lemon"]; /*array declaration*/

fruits.push("avacado"); /* Adding an element to the array*/

/*displaying elements of the array*/

for(var i=0; i < fruits.length; i++){
  console.log(fruits[i]);
}

Answer 6

You can use the push() if you want to add values e.g. arr.push("Test1", "Test2");

If you have array you can use concat() e.g. Array1.concat(Array2)

If you have just one element to add you can also try length menthod e.g. array[aray.length] = 'test';