| Name | Lines of code | Maintainability | Test coverage |
| src/Monad/Maybe/functions.php | 43 | A 0 mins | F 42% |
| src/Monad/Reader.php | 36 | A 0 mins | A 100% |
| src/Monad/Reader/functions.php | 30 | A 0 mins | A 100% |
| src/Monad/State.php | 41 | A 0 mins | A 100% |
| src/Monad/State/functions.php | 68 | A 0 mins | F 58% |
| src/Monad/Writer.php | 39 | A 0 mins | A 100% |
| src/Monad/Writer/functions.php | 39 | A 0 mins | F 10% |
| src/Primitive/EmptyListError.php | 11 | A 0 mins | A 100% |
| src/Primitive/Listt.php | 16 | A 0 mins | F 0% |
| src/Primitive/ListtCons.php | 108 | A 0 mins | A 98% |
| src/Primitive/ListtNil.php | 66 | A 0 mins | D 63% |
| src/Primitive/Num.php | 20 | A 0 mins | A 100% |
| src/Primitive/Product.php | 20 | A 0 mins | A 100% |
| src/Primitive/Stringg.php | 32 | A 0 mins | A 100% |
| src/Primitive/Sum.php | 20 | A 0 mins | A 100% |
| src/Primitive/TypeMismatchError.php | 13 | A 0 mins | A 100% |
| src/Useful/PatternMatcher.php | 7 | A 0 mins | F 0% |
| src/Useful/PatternNotMatchedError.php | 33 | A 0 mins | B 80% |
| src/Useful/SnapshotIterator.php | 31 | A 0 mins | A 100% |
| src/Useful/match.php | 77 | A 0 mins | A 100% |