JavaScript - Array & Methods

Dharshini E · Monday at 4:04 AM

1.What is an Array in JavaScript?
An array is a special type of object that can hold multiple values under a single name, and each value isstored at an index.

Index starts at 0.
You can store numbers, strings,objects, or even other arrays inside an array. example:

Code:

let fruits = ["Apple", "Banana", "Mango"];
console.log(fruits[0]); // Apple
console.log(fruits[2]); // Mango

2.What are Array Methods in JavaScript?
In JavaScript, array methods are built-in functionsthat you can use on arrays to perform common tasks.

Methods:

push() : Add item at the end. example:

Code:

let fruits = ["Apple", "Banana"];
fruits.push("Mango"); 
console.log(fruits); // ["Apple", "Banana", "Mango"]

pop() : Remove item from the end example:

Code:

fruits.pop();
console.log(fruits); // ["Apple", "Banana"]

shift() : Remove item from the beginning. example:

Code:

fruits.shift();
console.log(fruits); // ["Apple", "Banana"]

4.length :
Get the size of the array.
example:

Code:

console.log(fruits.length); // 2

indexOf() : Find the position of an element. example:

Code:

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

6.includes() :
Check if an element exists.
example:

Code:

console.log(fruits.includes("Apple")); // true

7.splice() :
Add/Remove elements (changes original array).
example:

Code:

nums.splice(2, 1); 
console.log(nums); // [1, 2, 4, 5]

JavaScript - Array & Methods

Dharshini E

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