JavaScript Array Methods: Essential Guide with Examples

Method	Description	Example
length()	Returns the number of elements in the array	let arr = [5,2]; arr.length // 2
push()	Adds an element to the end	let arr = [5,2]; arr.push(3) // [5,2,3]
unshift()	Adds an element to the start	let arr = [5,2,3]; arr.unshift(0) // [0,5,2,3]
shift()	Removes the first element	let arr = [5,2,3]; arr.shift() // [2,3]
pop()	Removes the last element	let arr = [5,2,3]; arr.pop() // [5,2]
indexOf()	Finds index of an element	let arr = [5,2,3]; arr.indexOf(2) // 1
includes()	Checks if an element exists	let arr = [5,2,3]; arr.includes(2) // true

length:

Returns the length of the array

Example

let arr = [5,2];

console.log(arr.length) // 2

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Add Element:

push() → Add to the end.
unshift() → Add to the beginning.

Example

let arr = ["1","2","3"];

arr.push("4");

console.log(arr); // ["1","2","3","4"]

arr.unshift("0");

console.log(arr); // ["0","1","2","3","4"]

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Remove Element:

pop() → Remove from the end.
shift() → Remove from the beginning.

Example

let arr = ["0","1","2","3","4"];

arr.pop();

console.log(arr); // ["0","1","2","3"]

arr.shift();

console.log(arr); // [1","2","3"]

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Search in Arrays:

indexof() → Find the index of a value.
includes() → Check if a value exists.

Example

let fruits = ["Apple","Banana","Cherry"];

console.log(fruits.indexOf("Banana")); // Output: 1

console.log(fruits.includes("Cherry")); // Output: true

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Method

Description

Example

length:

Add Element:

Remove Element:

Search in Arrays: