Easy

Find the First Occurrence of a Target

Time limit: 1 s
Memory limit: 128 MB
Estimated: 15 min

Arrays and Strings

Description

Given an array of integers and a target value, return the index of the target's first occurrence.

Use zero-based indexing. If the target does not appear in the array, return -1. If it appears multiple times, return the smallest index at which it occurs.

For example, in [4, 2, 7, 2] with target = 2, the answer is 1.

Implement firstOccurrence(nums, target) to return the required index.

Constraints

1 <= nums.length <= 1000 -1000000 <= nums[i] <= 1000000 -1000000 <= target <= 1000000

Sample cases

Sample 1
Input
```
nums = [4,2,7,2]
target = 2
```
Expected output
```
1
```
Sample 2
Input
```
nums = [1,3,5]
target = 4
```
Expected output
```
-1
```

Skills and languages

Concepts

Arrays

Languages

Python 3

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Sample 1

Input

Expected output

Sample 2

Input

Expected output

Concepts

Languages

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Sample 3

Input

Expected output