# Problem

This function returns the first item in an array.

```python
def first_item(arr):
    return arr[0]
```

# Solution


| Input Size | Loops  |
| --- | --- |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |

### How does the runtime increase w.r.t. input size?

It does not.
### What is the time complexity?

$O(1)$: indexing an array is a constant time operation.

-----
##### This workbook was created by Jad and Rayan Slim. Feel free to explore some of their courses:
##### [The Complete Java Development Bootcamp](https://udemy-redirect-app.herokuapp.com/java)
##### [The Complete Spring Boot Development Bootcamp – Become a Java Web Developer](https://udemy-redirect-app.herokuapp.com/spring)


Problem 10 Solution

Problem 12 Solution

Problem 4 Solution

Problem 8 Solution

Workbook

Problem 7 Solution

Problem 15 Solution

Problem 2 Solution

Problem 14 Solution

Problem 6 Solution

Problem 5 Solution

Problem 17 Solution

Problem 3 Solution

Problem 1 Solution

Problem 16 Solution

Problem 13 Solution

Problem 11 Solution

Problem 9 Solution

Big O