Function filterValue

filterValue<V>(
    v: V,
    predicate: (v: V) => boolean,
    skipValue: undefined | V,
): undefined | V
Returns v if predicate returns true, alternatively returning skipValue.
```
// Return true if value is less than 10
const p = v => v < 10;

filterValue(5, p, 0);   // 5
filterValue(20, p, 0);  // 0
```
Type Parameters
- V
Parameters
- v: V
  Value to test
- predicate: (v: V) => boolean
  Predicate
- skipValue: undefined | V
  Value to return if predicate returns false
Returns undefined | V
Input value if predicate is true, or skipValue if not.