Index - L
| last | Data.NonNull |
| lastEx | Data.MonoTraversable |
| lastMay | Data.MonoTraversable |
| LazySequence | Data.Sequences |
| length | Data.MonoTraversable.Unprefixed |
| length64 | Data.MonoTraversable.Unprefixed |
| lengthIndex | Data.Sequences |
| lines | Data.Sequences |
| lookup | Data.Containers |