| definition: |
isNothing :: Maybe _ -> Bool isNothing Nothing = True isNothing (Just _) = False |
| demand: |
argument 1 |
| deterministic: |
deterministic operation |
| documentation: |
--- Return `True` iff the argument is of the form `Nothing`. |
| failfree: |
_ |
| indeterministic: |
referentially transparent operation |
| infix: |
no fixity defined |
| iotype: |
{({Nothing}) |-> {True} || ({Just}) |-> {False}}
|
| name: |
isNothing |
| precedence: |
no precedence defined |
| result-values: |
{False,True}
|
| signature: |
Prelude.Maybe a -> Prelude.Bool |
| solution-complete: |
operationally complete operation |
| terminating: |
yes |
| totally-defined: |
reducible on all ground data terms |