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Null object: Difference between revisions
Added Rust.
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(Added Rust.) |
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NilClass
</pre>
=={{header|Rust}}==
<lang rust>// If an option may return null - or nothing - in Rust, it's wrapped
// in an Optional which may return either the type of object specified
// in <> or None. We can check this using .is_some() and .is_none() on
// the Option.
fn check_number(num: &Option<u8>) {
if num.is_none() {
println!("Number is: None");
} else {
println!("Number is: {}", num.unwrap());
}
}
fn main() {
let mut possible_number: Option<u8> = None;
check_number(&possible_number);
possible_number = Some(31);
check_number(&possible_number);
}</lang>
=={{header|Scala}}==
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