# Plus One Large Integer

In this lab, you are tasked with manipulating a **large integer** represented as an integer array `digits`

, where each `digits[i]`

is the `ith`

digit of the integer. The digits are ordered from most significant to least significant in left-to-right order. The large integer does not contain any leading `0`

's.

Your goal is to increment the large integer by one and return the *resulting array of digits*.

## Example

### Example 1:

**Input:** digits = [1,2,3]

**Output:** [1,2,4]

**Explanation:** The array represents the integer 123.

Incrementing by one gives 123 + 1 = 124.

Thus, the result should be [1,2,4].

### Example 2:

**Input:** digits = [4,3,2,1]

**Output:** [4,3,2,2]

**Explanation:** The array represents the integer 4321.

Incrementing by one gives 4321 + 1 = 4322.

Thus, the result should be [4,3,2,2].

### Example 3:

**Input:** digits = [9]

**Output:** [1,0]

**Explanation:** The array represents the integer 9.

Incrementing by one gives 9 + 1 = 10.

Thus, the result should be [1,0].

## Constraints:

`1 <= digits.length <= 100`

`0 <= digits[i] <= 9`

`digits`

does not contain any leading`0`

's.

## Challenges

- Write the function
`plusOne(digits)`

that increments the given integer array by one and returns the resulting array of digits. - Export the function
`plusOne(digits)`

properly so that it can be used in the evaluation script. - Write test cases for your implementation to ensure its correctness.