Try(T)

class Monads::Try(T)

Runs a proc that may raise and captures the outcome, which you then convert into a Maybe or an Either. See the Try guide.

Construction

.new(proc)

Executes proc immediately. If it returns a value, that value is stored; if it raises, the exception is captured.

Monads::Try(Float64).new(->{ 10.0 / 2 })

Methods

to_maybe

Returns Just(T) on success, or Nothing(T) if the proc raised.

Monads::Try(Int32).new(->{ 42 }).to_maybe          # => Just(42)
Monads::Try(Int32).new(->{ raise "boom" }).to_maybe # => Nothing(Int32)

to_either

Returns Right(Exception, T) on success, or LeftException(T) if the proc raised.

Monads::Try(Float64).new(->{ 10.0 / 2 }).to_either
# => Right(Exception, Float64) 5.0