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Mojo module

variant

Defines a Variant type.

You can use this type to implement variant/sum types. For example:

from utils import Variant

alias IntOrString = Variant[Int, String]
fn to_string(mut x: IntOrString) -> String:
  if x.isa[String]():
    return x[String]
  # x.isa[Int]()
  return str(x[Int])

# They have to be mutable for now, and implement CollectionElement
var an_int = IntOrString(4)
var a_string = IntOrString(String("I'm a string!"))
var who_knows = IntOrString(0)
import random
if random.random_ui64(0, 1):
    who_knows.set[String]("I'm actually a string too!")

print(to_string(an_int))
print(to_string(a_string))
print(to_string(who_knows))
from utils import Variant

alias IntOrString = Variant[Int, String]
fn to_string(mut x: IntOrString) -> String:
  if x.isa[String]():
    return x[String]
  # x.isa[Int]()
  return str(x[Int])

# They have to be mutable for now, and implement CollectionElement
var an_int = IntOrString(4)
var a_string = IntOrString(String("I'm a string!"))
var who_knows = IntOrString(0)
import random
if random.random_ui64(0, 1):
    who_knows.set[String]("I'm actually a string too!")

print(to_string(an_int))
print(to_string(a_string))
print(to_string(who_knows))

Structs​