rustlings/exercises/options/options2.rs

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2022-07-14 15:34:50 +00:00
// options2.rs
2022-07-14 15:53:42 +00:00
// Execute `rustlings hint options2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn simple_option() {
let target = "rustlings";
let optional_target = Some(target);
// TODO: Make this an if let statement whose value is "Some" type
if let Some(word) = optional_target {
assert_eq!(word, target);
}
}
#[test]
fn layered_option() {
let mut range = 10;
let mut optional_integers: Vec<Option<i8>> = Vec::new();
for i in 0..(range + 1) {
optional_integers.push(Some(i));
}
// TODO: make this a while let statement - remember that vector.pop also adds another layer of Option<T>
// You can stack `Option<T>`'s into while let and if let
while let Some(Some(integer)) = optional_integers.pop() {
assert_eq!(integer, range);
range -= 1;
}
}
}