/// var turns_out_to_be_100 = TsMonad.Maybe.just(10) .caseOf({ just: n => n * n, nothing: () => -1 }); var turns_out_to_be_nothing = TsMonad.Maybe.nothing() .caseOf({ just: n => n * n, nothing: () => -1 }); var turns_out_to_be_true = TsMonad.Maybe.just(123) .lift(n => n * 2) .caseOf({ just: n => n === 246, nothing: () => false });