Insert Element at the End of an Array

Given an array of integers, the task is to insert an element at the end of the array.

Examples:

Input: arr[] = [10, 20, 30, 40], ele = 50
Output: [10, 20, 30, 40, 50]

Input: arr[] = [], ele = 20
Output: [20]

[Approach 1] Using Built-In Methods

We will use library methods like push_back() in C++, add() in Java and C#, append() in Python and push() in JavaScript.

Array before insertion
10 20 30 40 
Array after insertion
10 20 30 40 50 

Time Complexity: O(1)
Auxiliary Space: O(1)

[Approach 2] Using Custom Method

To insert an element at the end of an array, we can simply add the new element at the nth index.

Array before insertion
10 20 30 40 
Array after insertion
10 20 30 40 50 

Time Complexity: O(1)
Auxiliary Space: O(1)