DSA using JavaScript

Push: Adds an element to the end of the array.
Unshift: Adds an element to the beginning of the array.
Splice: Adds an element at a specified index.

Array

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

// Insertion at the end
arr.push(6); // [1, 2, 3, 4, 5, 6]

// Insertion at the beginning
arr.unshift(0); // [0, 1, 2, 3, 4, 5, 6]

// Insertion at index 3
arr.splice(3, 0, 'a'); // [0, 1, 2, 'a', 3, 4, 5, 6]
console.log(arr);

let arr = [0, 1, 2, 'a', 3, 4, 5, 6];

// Deletion from the end
arr.pop(); // [0, 1, 2, 'a', 3, 4, 5]

// Deletion from the beginning
arr.shift(); // [1, 2, 'a', 3, 4, 5]

// Deletion at index 2
arr.splice(2, 1); // [1, 2, 3, 4, 5]
console.log(arr);

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

// Searching for an element
let index = arr.indexOf(3); // 2

// Checking if an element exists
let exists = arr.includes(4); // true
console.log(exists);

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

// Traversal using a for loop
for (let i = 0; i < arr.length; i++) {
    console.log(arr[i]);
}

// Traversal using forEach
arr.forEach(element => console.log(element));

// Traversal using map (creates a new array)
let squaredArr = arr.map(element => element * element); // [1, 4, 9, 16, 25]
console.log(squaredArr);