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Adding options

This commit is contained in:
David E. Perez Negron R. 2023-11-21 20:00:03 -06:00
parent a7ac566467
commit 4f31cb6daf
3 changed files with 12 additions and 11 deletions
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9
exercises/options/options1.rs
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@ -3,7 +3,6 @@
// Execute `rustlings hint options1` or use the `hint` watch subcommand for a // Execute `rustlings hint options1` or use the `hint` watch subcommand for a
// hint. // hint.
// I AM NOT DONE
// This function returns how much icecream there is left in the fridge. // This function returns how much icecream there is left in the fridge.
// If it's before 10PM, there's 5 pieces left. At 10PM, someone eats them // If it's before 10PM, there's 5 pieces left. At 10PM, someone eats them
@ -13,7 +12,9 @@ fn maybe_icecream(time_of_day: u16) -> Option<u16> {
// value of 0 The Option output should gracefully handle cases where // value of 0 The Option output should gracefully handle cases where
// time_of_day > 23. // time_of_day > 23.
// TODO: Complete the function body - remember to return an Option! // TODO: Complete the function body - remember to return an Option!
??? if time_of_day < 22 { Some(5) }
else if time_of_day >= 22 && time_of_day < 25 { Some(0) }
else { None }
} }
#[cfg(test)] #[cfg(test)]
@ -33,7 +34,7 @@ mod tests {
fn raw_value() { fn raw_value() {
// TODO: Fix this test. How do you get at the value contained in the // TODO: Fix this test. How do you get at the value contained in the
// Option? // Option?
let icecreams = maybe_icecream(12); let icecreams = maybe_icecream(12).expect("No icecream");
assert_eq!(icecreams, 5); assert_eq!(icecreams, 5u16);
} }
} }

7
exercises/options/options2.rs
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@ -3,7 +3,6 @@
// Execute `rustlings hint options2` or use the `hint` watch subcommand for a // Execute `rustlings hint options2` or use the `hint` watch subcommand for a
// hint. // hint.
// I AM NOT DONE
#[cfg(test)] #[cfg(test)]
mod tests { mod tests {
@ -13,7 +12,7 @@ mod tests {
let optional_target = Some(target); let optional_target = Some(target);
// TODO: Make this an if let statement whose value is "Some" type // TODO: Make this an if let statement whose value is "Some" type
word = optional_target { if let Some(word) = optional_target {
assert_eq!(word, target); assert_eq!(word, target);
} }
} }
@ -32,10 +31,12 @@ mod tests {
// TODO: make this a while let statement - remember that vector.pop also // 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 // adds another layer of Option<T>. You can stack `Option<T>`s into
// while let and if let. // while let and if let.
integer = optional_integers.pop() { while let Some(int) = optional_integers.pop() {
if let Some(integer) = int {
assert_eq!(integer, cursor); assert_eq!(integer, cursor);
cursor -= 1; cursor -= 1;
} }
}
assert_eq!(cursor, 0); assert_eq!(cursor, 0);
} }

3
exercises/options/options3.rs
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@ -3,7 +3,6 @@
// Execute `rustlings hint options3` or use the `hint` watch subcommand for a // Execute `rustlings hint options3` or use the `hint` watch subcommand for a
// hint. // hint.
// I AM NOT DONE
struct Point { struct Point {
x: i32, x: i32,
@ -13,7 +12,7 @@ struct Point {
fn main() { fn main() {
let y: Option<Point> = Some(Point { x: 100, y: 200 }); let y: Option<Point> = Some(Point { x: 100, y: 200 });
match y { match &y {
Some(p) => println!("Co-ordinates are {},{} ", p.x, p.y), Some(p) => println!("Co-ordinates are {},{} ", p.x, p.y),
_ => panic!("no match!"), _ => panic!("no match!"),
} }