Mojo module
optional
Defines Optional, a type modeling a value which may or may not be present.
Optional values can be thought of as a type-safe nullable pattern.
Your value can take on a value or None
, and you need to check
and explicitly extract the value to get it out.
from collections import Optional
var a = Optional(1)
var b = Optional[Int](None)
if a:
print(a.value()) # prints 1
if b: # bool(b) is False, so no print
print(b.value())
var c = a.or_else(2)
var d = b.or_else(2)
print(c) # prints 1
print(d) # prints 2
from collections import Optional
var a = Optional(1)
var b = Optional[Int](None)
if a:
print(a.value()) # prints 1
if b: # bool(b) is False, so no print
print(b.value())
var c = a.or_else(2)
var d = b.or_else(2)
print(c) # prints 1
print(d) # prints 2
Structsβ
- β
Optional
: A type modeling a value which may or may not be present. - β
OptionalReg
: A register-passable optional type.
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