Methods in JavaScript?

1. push() → Add element at end Adds a new element to the end of the array.[]

let fruits = ["apple", "banana"];
fruits.push("mango");

console.log(fruits);

👉 Output:

["apple", "banana", "mango"]

1. pop() → Remove last element Removes the last item from the array.

JavaScript

let fruits = ["apple", "banana", "mango"];
fruits.pop();

console.log(fruits);

👉 Output:

["apple", "banana"]

✔️ Use when removing the latest item

🔹 3. shift() → Remove first element

Removes the first element.

JavaScript

let fruits = ["apple", "banana", "mango"];
fruits.shift();

console.log(fruits);
// ["banana", "mango"]

👉 Use when removing from start

🔹 4. unshift() → Add at beginning

Adds element to the start of array.

JavaScript

let fruits = ["banana", "mango"];
fruits.unshift("apple");

console.log(fruits);
// ["apple", "banana", "mango"]

👉 Use when adding at start

🔹 5. length → Find array size
Gives total number of elements.

JavaScript

let fruits = ["apple", "banana", "mango"];
console.log(fruits.length);
// 3

👉 Useful for loops and counting

🔹 6. includes() → Check value exists

Checks if a value is present in array.

JavaScript

let fruits = ["apple", "banana", "mango"];
console.log(fruits.includes("banana"));
// true

👉 Returns true or false

🔹 7. indexOf() → Find position

Returns index (position) of element.

JavaScript

let fruits = ["apple", "banana", "mango"];
console.log(fruits.indexOf("mango"));
// 2

👉 If not found → returns -1

🔹 8. join() → Convert array to string

Joins all elements into a string.

JavaScript

let fruits = ["apple", "banana", "mango"];
console.log(fruits.join(", "));
// "apple, banana, mango"

👉 Useful for displaying data

🔹 9. slice() → Get part of array
Returns a portion of array (does not change original).

JavaScript

let fruits = ["apple", "banana", "mango"];
console.log(fruits.slice(0, 2));
// ["apple", "banana"]

👉 Start index included, end index excluded

🔹 10. splice() → Add/Remove elements

Changes the original array.

JavaScript

let fruits = ["apple", "banana", "mango"];
fruits.splice(1, 1);

console.log(fruits);
// ["apple", "mango"]

👉 Syntax:

JavaScript

array.splice(start, deleteCount, newItem)