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Diffstat (limited to 'docs')
| -rw-r--r-- | docs/optionals.md | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/docs/optionals.md b/docs/optionals.md index 445a9681..1414ca6a 100644 --- a/docs/optionals.md +++ b/docs/optionals.md @@ -28,3 +28,20 @@ func maybe_takes_int(x:Int?): This establishes a common language for talking about optional values without having to use a more generalized form of `enum` which may have different naming conventions and which would generate a lot of unnecessary code. + +In addition to using conditionals to check for null values, you can also use +`:or_else(fallback)` or `:or_fail()`: + +```tomo +maybe_x := 5? +>> maybe_x:or_else(-1) += 5 : Int +>> maybe_x:or_fail() += 5 : Int + +maybe_x = !Int +>> maybe_x:or_else(-1) += -1 : Int +>> maybe_x:or_fail() +# Failure! +``` |