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Tina Müller 2016-12-05 23:44:36 +01:00
parent 9dc3c2bb62
commit bba7bfd280
13208 changed files with 134745 additions and 0 deletions
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Task/Null-object/Lily/null-object.lily Normal file
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enum class Option[A] {
Some(A)
None
}
# Only variables of class Option can be assigned to None.
# Type: Option[integer]
var v = Some(10)
# Valid: v is an Option, and any Option can be assigned to None
v = None
# Invalid! v is an Option[integer], not just a plain integer.
v = 10
# Type: integer
var w = 10
# Invalid! Likewise, w is an integer, not an Option.
w = None