# Find First Occurrence of a Number in an Array

## Question

[Sloth Bytes | 2024-07-02](https://slothbytes.beehiiv.com/p/debugging?utm_source=slothbytes.beehiiv.com&utm_medium=newsletter&utm_campaign=debugging-techniques-you-should-know)

```
Binary Search Practice
Given a sorted array of integers and a target integer, find the first occurrence of the target and return its index.

Return -1 if the target is not in the array.

Examples
#Input:

arr = [1, 3, 3, 3, 3, 6, 10, 10, 10, 100]

target = 3

find_first_occurrence(arr,target) # Return 1

#Explanation: The first occurrence of 3 is at index 1.
#Input:

arr = [2, 3, 5, 7, 11, 13, 17, 19]

target = 6
find_first_occurrence(arr,target) # Return -1

#Explanation: 6 does not exist in the array.
```

## Description

This utility takes a user input of array items and target input. The code finds the first occurrence of the target number in the given array which will be sorted.

## Table of Contents

- [Installation](#installation)
- [Usage](#usage)

## Installation

To use the code in this repository, you need to have [Node.js](https://nodejs.org/en) installed on your machine. Clone the repository to your local system using the following command:

```
git clone https://github.com/afiqzudinhadi/first-occurrence.git
```

Install the required dependencies by running the following command:

```
npm install
```

## Usage

1. Navigate to the repository's root directory.
2. Open terminal or command prompt.
3. Run the following command to execute the code:

```
npm run index
```

4. Follow the on-screen instructions to input the array or string and the element you want to find the first occurrence of.