rustlings/exercises/12_options/options2.rs
2024-06-26 14:35:05 +02:00

40 lines
965 B
Rust

fn main() {
// You can optionally experiment here.
}
#[cfg(test)]
mod tests {
#[test]
fn simple_option() {
let target = "rustlings";
let optional_target = Some(target);
// TODO: Make this an if-let statement whose value is `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;
// TODO: Make this a while-let statement. Remember that `Vec::pop()`
// adds another layer of `Option`. You can do nested pattern matching
// in if-let and while-let statements.
integer = optional_integers.pop() {
assert_eq!(integer, cursor);
cursor -= 1;
}
assert_eq!(cursor, 0);
}
}