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struct Struct(x:Int, y:Text):
func maybe(should_i:Bool)->Struct?:
if should_i:
return Struct(123, "hello")
else:
return !Struct
enum Enum(X, Y(y:Int)):
func maybe(should_i:Bool)->Enum?:
if should_i:
return Enum.Y(123)
else:
return !Enum
func maybe_int(should_i:Bool)->Int?:
if should_i:
return 123
else:
return !Int
func maybe_array(should_i:Bool)->[Int]?:
if should_i:
return [10, 20, 30]
else:
return ![Int]
func maybe_bool(should_i:Bool)->Bool?:
if should_i:
return no
else:
return !Bool
func maybe_text(should_i:Bool)->Text?:
if should_i:
return "Hello"
else:
return !Text
func maybe_num(should_i:Bool)->Num?:
if should_i:
return 12.3
else:
return !Num
func maybe_lambda(should_i:Bool)-> func()?:
if should_i:
return func(): say("hi!")
else:
return !func()
func maybe_c_string(should_i:Bool)->CString?:
if should_i:
return ("hi":as_c_string())?
else:
return !CString
func maybe_channel(should_i:Bool)->|Int|?:
if should_i:
return |:Int|?
else:
return !|Int|
func maybe_thread(should_i:Bool)->Thread?:
if should_i:
return Thread.new(func(): pass)
else:
return !Thread
func main():
>> 5?
= 5? : Int?
>> if no:
!Int
else:
5
= 5? : Int?
do:
!! Ints:
>> yep := maybe_int(yes)
= 123?
>> nope := maybe_int(no)
= !Int
>> if yep:
>> yep
= 123
else: fail("Falsey: $yep")
>> if nope:
fail("Truthy: $nope")
else: !! Falsey: $nope
do:
!! ...
!! Arrays:
>> yep := maybe_array(yes)
= [10, 20, 30]?
>> nope := maybe_array(no)
= ![Int]
>> if yep:
>> yep
= [10, 20, 30]
else: fail("Falsey: $yep")
>> if nope:
fail("Truthy: $nope")
else: !! Falsey: $nope
do:
!! ...
!! Bools:
>> yep := maybe_bool(yes)
= no?
>> nope := maybe_bool(no)
= !Bool
>> if yep:
>> yep
= no
else: fail("Falsey: $yep")
>> if nope:
fail("Truthy: $nope")
else: !! Falsey: $nope
do:
!! ...
!! Text:
>> yep := maybe_text(yes)
= "Hello"?
>> nope := maybe_text(no)
= !Text
>> if yep:
>> yep
= "Hello"
else: fail("Falsey: $yep")
>> if nope:
fail("Truthy: $nope")
else: !! Falsey: $nope
do:
!! ...
!! Nums:
>> yep := maybe_num(yes)
= 12.3?
>> nope := maybe_num(no)
= !Num
>> if yep:
>> yep
= 12.3
else: fail("Falsey: $yep")
>> if nope:
fail("Truthy: $nope")
else: !! Falsey: $nope
do:
!! ...
!! Lambdas:
>> yep := maybe_lambda(yes)
= func(): ...?
>> nope := maybe_lambda(no)
= !func()
>> if yep:
>> yep
= func(): ...
else: fail("Falsey: $yep")
>> if nope:
fail("Truthy: $nope")
else: !! Falsey: $nope
do:
!! ...
!! Structs:
>> yep := Struct.maybe(yes)
= Struct(x=123, y="hello")?
>> nope := Struct.maybe(no)
= !Struct
>> if yep:
>> yep
= Struct(x=123, y="hello")
else: fail("Falsey: $yep")
>> if nope:
fail("Truthy: $nope")
else: !! Falsey: $nope
do:
!! ...
!! Enums:
>> yep := Enum.maybe(yes)
= Enum.Y(y=123)?
>> nope := Enum.maybe(no)
= !Enum
>> if yep:
>> yep
= Enum.Y(y=123)
else: fail("Falsey: $yep")
>> if nope:
fail("Truthy: $nope")
else: !! Falsey: $nope
do:
!! ...
!! C Strings:
>> yep := maybe_c_string(yes)
= CString("hi")?
>> nope := maybe_c_string(no)
= !CString
>> if yep:
>> yep
= CString("hi")
else: fail("Falsey: $yep")
>> if nope:
fail("Truthy: $nope")
else: !! Falsey: $nope
do:
!! ...
!! Channels:
>> yep := maybe_channel(yes)
# No "=" test here because channels use addresses in the text version
>> nope := maybe_channel(no)
= !|:Int|
>> if yep: >> yep
else: fail("Falsey: $yep")
>> if nope:
fail("Truthy: $nope")
else: !! Falsey: $nope
do:
!! ...
!! Threads:
>> yep := maybe_thread(yes)
# No "=" test here because threads use addresses in the text version
>> nope := maybe_thread(no)
= !Thread
>> if yep: >> yep
else: fail("Falsey: $yep")
>> if nope:
fail("Truthy: $nope")
else: !! Falsey: $nope
if yep := maybe_int(yes):
>> yep
= 123 : Int
else: fail("Unreachable")
|
