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Complete strings exercises

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This commit is contained in:
Robert Zhao 2023-06-09 18:30:16 -04:00
parent 88b29e4095
commit cf534fa0b8
4 changed files with 24 additions and 29 deletions
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4
exercises/strings/strings1.rs
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@ -2,13 +2,11 @@
// Make me compile without changing the function signature! // Make me compile without changing the function signature!
// Execute `rustlings hint strings1` or use the `hint` watch subcommand for a hint. // Execute `rustlings hint strings1` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn main() { fn main() {
let answer = current_favorite_color(); let answer = current_favorite_color();
println!("My current favorite color is {}", answer); println!("My current favorite color is {}", answer);
} }
fn current_favorite_color() -> String { fn current_favorite_color() -> String {
"blue" String::from("blue")
} }

6
exercises/strings/strings2.rs
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@ -2,17 +2,15 @@
// Make me compile without changing the function signature! // Make me compile without changing the function signature!
// Execute `rustlings hint strings2` or use the `hint` watch subcommand for a hint. // Execute `rustlings hint strings2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn main() { fn main() {
let word = String::from("green"); // Try not changing this line :) let word = String::from("green"); // Try not changing this line :)
if is_a_color_word(word) { if is_a_color_word(&word) {
println!("That is a color word I know!"); println!("That is a color word I know!");
} else { } else {
println!("That is not a color word I know."); println!("That is not a color word I know.");
} }
} }
fn is_a_color_word(attempt: &str) -> bool { fn is_a_color_word(attempt: &String) -> bool {
attempt == "green" || attempt == "blue" || attempt == "red" attempt == "green" || attempt == "blue" || attempt == "red"
} }

21
exercises/strings/strings3.rs
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@ -1,21 +1,16 @@
// strings3.rs // strings3.rs
// Execute `rustlings hint strings3` or use the `hint` watch subcommand for a hint. // Execute `rustlings hint strings3` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn trim_me(input: &str) -> String { fn trim_me(input: &str) -> String {
// TODO: Remove whitespace from both ends of a string! String::from(input.trim())
???
} }
fn compose_me(input: &str) -> String { fn compose_me(input: &str) -> String {
// TODO: Add " world!" to the string! There's multiple ways to do this! format!("{input} world!")
???
} }
fn replace_me(input: &str) -> String { fn replace_me(input: &str) -> String {
// TODO: Replace "cars" in the string with "balloons"! String::from(input.replace("cars", "balloons"))
???
} }
#[cfg(test)] #[cfg(test)]
@ -37,7 +32,13 @@ mod tests {
#[test] #[test]
fn replace_a_string() { fn replace_a_string() {
assert_eq!(replace_me("I think cars are cool"), "I think balloons are cool"); assert_eq!(
assert_eq!(replace_me("I love to look at cars"), "I love to look at balloons"); replace_me("I think cars are cool"),
"I think balloons are cool"
);
assert_eq!(
replace_me("I love to look at cars"),
"I love to look at balloons"
);
} }
} }

22
exercises/strings/strings4.rs
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@ -6,8 +6,6 @@
// before the parentheses on each line. If you're right, it will compile! // before the parentheses on each line. If you're right, it will compile!
// No hints this time! // No hints this time!
// I AM NOT DONE
fn string_slice(arg: &str) { fn string_slice(arg: &str) {
println!("{}", arg); println!("{}", arg);
} }
@ -16,14 +14,14 @@ fn string(arg: String) {
} }
fn main() { fn main() {
???("blue"); string_slice("blue");
???("red".to_string()); string("red".to_string());
???(String::from("hi")); string(String::from("hi"));
???("rust is fun!".to_owned()); string("rust is fun!".to_owned());
???("nice weather".into()); string("nice weather".into());
???(format!("Interpolation {}", "Station")); string(format!("Interpolation {}", "Station"));
???(&String::from("abc")[0..1]); string_slice(&String::from("abc")[0..1]);
???(" hello there ".trim()); string_slice(" hello there ".trim());
???("Happy Monday!".to_string().replace("Mon", "Tues")); string("Happy Monday!".to_string().replace("Mon", "Tues"));
???("mY sHiFt KeY iS sTiCkY".to_lowercase()); string("mY sHiFt KeY iS sTiCkY".to_lowercase());
} }