import std/options
import pkg/shakar

var nam = some("John")
assert *nam    ## `*` is used to check if the optional has a value

var age = none(uint8)
assert !age    ## `!` is used to check if the optional is empty

nam.applyThis:
  ## `applyThis` gives you a mutable `this` which is either
  ## the value of the optional if it has one, or the default
  ## value of that type (`default(T)`)
  this &= " Doe"

age.applyThis:
  assert this == 0 ## default initialized value since the optional is empty
  this = 28

## Store `nam` into the `name` value. This operator returns true if the optional wasn't empty.
if nam ?= name:
  echo "Name: " & name

if age ?= ayu:
  echo "Age: " & $ayu