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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 none
enum Enum(X, Y(y:Int))
func maybe(should_i:Bool->Enum?)
if should_i
return Enum.Y(123)
else
return none
func maybe_int(should_i:Bool->Int?)
if should_i
return 123
else
return none
func maybe_int64(should_i:Bool->Int64?)
if should_i
return Int64(123)
else
return none
func maybe_list(should_i:Bool->[Int]?)
if should_i
return [10, 20, 30]
else
return none
func maybe_bool(should_i:Bool->Bool?)
if should_i
return no
else
return none
func maybe_text(should_i:Bool->Text?)
if should_i
return "Hello"
else
return none
func maybe_num(should_i:Bool->Num?)
if should_i
return 12.3
else
return none
func maybe_lambda(should_i:Bool-> func()?)
if should_i
return func() say("hi!")
else
return none
func maybe_c_string(should_i:Bool->CString?)
if should_i
return "hi".as_c_string()
else
return none
func main()
optional : Int? = 5
assert optional == 5
assert (
if no
x : Int? = none
x
else
5
) == 5
assert (optional or -1) == 5
assert (optional or fail("Non-none is falsey")) == 5
assert (optional or exit("Non-none is falsey")) == 5
>> none_int : Int? = none
assert none_int or -1 == -1
do
say("Ints:")
yep := maybe_int(yes)
assert yep == 123
nope := maybe_int(no)
assert nope == none
>> if yep
assert yep == 123
else fail("Falsey: $yep")
>> if nope
fail("Truthy: $nope")
else say("Falsey: $nope")
do
say("Int64s:")
yep := maybe_int64(yes)
assert yep == Int64(123)
nope := maybe_int64(no)
assert nope == none
>> if yep
assert yep == Int64(123)
else fail("Falsey: $yep")
>> if nope
fail("Truthy: $nope")
else say("Falsey: $nope")
do
say("Lists:")
yep := maybe_list(yes)
assert yep == [10, 20, 30]
nope := maybe_list(no)
assert nope == none
>> if yep
assert yep == [10, 20, 30]
else fail("Falsey: $yep")
>> if nope
fail("Truthy: $nope")
else say("Falsey: $nope")
do
say("...")
say("Bools:")
yep := maybe_bool(yes)
assert yep == no
nope := maybe_bool(no)
assert nope == none
>> if yep
assert yep == no
else fail("Falsey: $yep")
>> if nope
fail("Truthy: $nope")
else say("Falsey: $nope")
do
say("...")
say("Text:")
yep := maybe_text(yes)
assert yep == "Hello"
nope := maybe_text(no)
assert nope == none
>> if yep
assert yep == "Hello"
else fail("Falsey: $yep")
>> if nope
fail("Truthy: $nope")
else say("Falsey: $nope")
do
say("...")
say("Nums:")
yep := maybe_num(yes)
assert yep == 12.3
nope := maybe_num(no)
assert nope == none
>> if yep
assert yep == 12.3
else fail("Falsey: $yep")
>> if nope
fail("Truthy: $nope")
else say("Falsey: $nope")
do
say("...")
say("Lambdas:")
nope := maybe_lambda(no)
assert nope == none
>> if nope
fail("Truthy: $nope")
else say("Falsey: $nope")
do
say("...")
say("Structs:")
yep := Struct.maybe(yes)
assert yep == Struct(x=123, y="hello")
nope := Struct.maybe(no)
assert nope == none
>> if yep
assert yep == Struct(x=123, y="hello")
else fail("Falsey: $yep")
>> if nope
fail("Truthy: $nope")
else say("Falsey: $nope")
do
say("...")
say("Enums:")
yep := Enum.maybe(yes)
assert yep == Enum.Y(123)
nope := Enum.maybe(no)
assert nope == none
>> if yep
assert yep == Enum.Y(123)
else fail("Falsey: $yep")
>> if nope
fail("Truthy: $nope")
else say("Falsey: $nope")
do
say("...")
say("C Strings:")
yep := maybe_c_string(yes)
assert yep == CString("hi")
nope := maybe_c_string(no)
assert nope == none
>> if yep
assert yep == CString("hi")
else fail("Falsey: $yep")
>> if nope
fail("Truthy: $nope")
else say("Falsey: $nope")
if yep := maybe_int(yes)
assert yep == 123
else fail("Unreachable")
assert maybe_int(yes)! == 123
# Test comparisons, hashing, equality:
assert none != optional
assert optional == 5
>> nones : {Int?=Bool} = {none=yes, none=yes}
assert nones.keys == [none]
assert [5, none, none, 6].sorted() == [none, none, 5, 6]
do
assert (if var := optional then var else 0) == 5
do
assert (if var : Int? = none then var else 0) == 0
do
>> opt : Int? = 5
>> if opt
>> opt
else
>> opt
do
>> opt : Int? = none
>> if opt
>> opt
else
>> opt
assert not optional == no
>> nah : Int? = none
assert not nah == yes
assert [none, Struct(5,"A"), Struct(6,"B"), Struct(7,"C")] == [none, Struct(x=5, y="A"), Struct(x=6, y="B"), Struct(x=7, y="C")]
if optional or no
say("Binary op 'or' works with optionals")
else
fail("Failed to do binary op 'or' on optional")
|
