Array.push()

The Array.push() method in JavaScript is used to add one or more elements to the end of an array. It modifies the original array and returns the new length of the array.

Syntax

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push()
push(element1)
push(element1, element2)
push(element1, element2, /* …, */ elementN)

Parameters

ParameterDescription
element1, element2, ..., elementNThe elements to be added to the end of the array. These can be of any type, including objects, arrays, or primitives.

Return Value

The push() method returns the new length of the array after the elements have been added.

Examples

1. Adding a Single Element

This example demonstrates how to use push() to add a single element to an array.

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const fruits = ["apple", "banana"];
const newLength = fruits.push("cherry");

console.log(fruits);
console.log(newLength);

Output

[ 'apple', 'banana', 'cherry' ]
3
  1. The array fruits now includes the new element "cherry".
  2. The push() method returned the new length of the array: 3.

2. Adding Multiple Elements

You can use push() to add multiple elements at once.

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const fruits = ["apple"];
const newLength = fruits.push("banana", "cherry");

console.log(fruits);
console.log(newLength);

Output

[ 'apple', 'banana', 'cherry' ]
3
  1. The elements "banana" and "cherry" were added to the array fruits.
  2. The push() method returned the new length of the array: 3.

3. Using push() with Objects

The push() method can also be used to add objects to an array.

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const users = [{ name: "Akash" }];
const newLength = users.push({ name: "Bhairav" });

console.log(users);
console.log(newLength);

Output

[ { name: 'Akash' }, { name: 'Bhairav' } ]
2
  1. The object { name: "Bhairav" } was added to the users array.
  2. The push() method returned the new length of the array: 2.

4. Using push() in a Function

You can use push() in a function to dynamically add elements to an array.

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function addFruit(fruits, newFruit) {
    fruits.push(newFruit);
    return fruits;
}

const fruits = ["apple", "banana"];
console.log(addFruit(fruits, "cherry"));

Output

[ 'apple', 'banana', 'cherry' ]

The push() method was used to dynamically add "cherry" to the fruits array.