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rustlings/solutions/12_options/options2.rs

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2024-06-26 08:35:05 -04:00
fn main() {
// You can optionally experiment here.
}
#[cfg(test)]
mod tests {
#[test]
fn simple_option() {
let target = "rustlings";
let optional_target = Some(target);
// if-let
if let Some(word) = optional_target {
assert_eq!(word, target);
}
}
#[test]
fn layered_option() {
let range = 10;
let mut optional_integers: Vec<Option<i8>> = vec![None];
for i in 1..=range {
optional_integers.push(Some(i));
}
let mut cursor = range;
// while-let with nested pattern matching
while let Some(Some(integer)) = optional_integers.pop() {
assert_eq!(integer, cursor);
cursor -= 1;
}
assert_eq!(cursor, 0);
}
}