Function clampIndex

clampIndex(v: number, arrayOrLength: number | readonly any[]): number
Clamps integer v between 0 (inclusive) and array length or length (exclusive). Returns value then will always be at least zero, and a valid array index.
Parameters
- v: number
  Value to clamp (must be an interger)
- arrayOrLength: number | readonly any[]
  Array, or length of bounds (must be an integer)
Returns number
Clamped value, minimum will be 0, maximum will be one less than length.
Example: Usage
```
// Array of length 4
const myArray = [`a`, `b`, `c`, `d`];
clampIndex(0, myArray);    // 0
clampIndex(5, 3); // 2
```
Throws an error if v is not an integer.

For some data it makes sense that data might 'wrap around' if it exceeds the range. For example rotation angle. Consider using wrap for this.