Function atMod

atMod<T>(array: T[], index: number): T
Returns the item in an array at a given index, possibly wrapping if the index is not a valid index of the array. Example
```
atMod([red, green, blue], 1) == green
atMod([red, green, blue], 4) == green
atMod([red, green, blue], -2) == green
```
Type Parameters
- T
Parameters
- array: T[]
  Array of items
- index: number
  index to retrieve
Returns T