# Odd Up, Even Down
by Helen Yu
tags: arrays, control_flow, numbers, language_fundamentals

## Summary
> Create a function that goes through the array, incrementing (+1) for each odd number and decrementing (-1) for each even number.
> Examples
> transform([1, 2, 3, 4, 5]) ➞ [2, 1, 4, 3, 6]
> transform([3, 3, 4, 3]) ➞ [4, 4, 3, 4]
> transform([2, 2, 0, 8, 10]) ➞ [1, 1, -1, 7, 9]
> Notes
> N/A

## Instructions
Create a function that goes through the array, **incrementing (+1)** for each odd number and **decrementing (-1)** for each even number.

### Examples
```
transform([1, 2, 3, 4, 5]) ➞ [2, 1, 4, 3, 6]

transform([3, 3, 4, 3]) ➞ [4, 4, 3, 4]

transform([2, 2, 0, 8, 10]) ➞ [1, 1, -1, 7, 9]
```

### Notes
N/A