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🐛 fix bugs

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This commit is contained in:
breayhing 2024-07-11 22:02:46 +08:00
parent 1767f47bc6
commit fa7e4f8ade
1 changed files with 3 additions and 3 deletions
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6
solutions/12_options/options4.rs
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@ -10,7 +10,7 @@ fn main() {
// Exercise 1: Use ok_or to convert optional_point to a Result. // Exercise 1: Use ok_or to convert optional_point to a Result.
// If the point exists, print its coordinates. // If the point exists, print its coordinates.
// If it doesn't, print the error message "Point does not exist". // If it doesn't, print the error message "Point does not exist".
let result_point = optional_point.ok_or("Point does not exist"); let result_point = optional_point.clone().ok_or("Point does not exist");
match result_point { match result_point {
Ok(p) => println!("Co-ordinates are {},{}", p.x, p.y), Ok(p) => println!("Co-ordinates are {},{}", p.x, p.y),
Err(e) => println!("{}", e), Err(e) => println!("{}", e),
@ -18,7 +18,7 @@ fn main() {
// Exercise 2: Use ok_or_else to achieve the same functionality as above, // Exercise 2: Use ok_or_else to achieve the same functionality as above,
// but with a closure to generate the error message. // but with a closure to generate the error message.
let result_point_else = optional_point.ok_or_else(|| "Point does not exist"); let result_point_else = optional_point.clone().ok_or_else(|| "Point does not exist");
match result_point_else { match result_point_else {
Ok(p) => println!("Co-ordinates are {},{}", p.x, p.y), Ok(p) => println!("Co-ordinates are {},{}", p.x, p.y),
Err(e) => println!("{}", e), Err(e) => println!("{}", e),
@ -27,7 +27,7 @@ fn main() {
// Exercise 3: Use and_then to chain operations on optional_point. // Exercise 3: Use and_then to chain operations on optional_point.
// If the point exists, compute the distance from the origin and return it as an Option. // If the point exists, compute the distance from the origin and return it as an Option.
// If it doesn't, return None. // If it doesn't, return None.
let distance_from_origin = optional_point.and_then(|p| { let distance_from_origin = optional_point.clone().and_then(|p| {
let distance = ((p.x.pow(2) + p.y.pow(2)) as f64).sqrt(); let distance = ((p.x.pow(2) + p.y.pow(2)) as f64).sqrt();
Some(distance) Some(distance)
}); });