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strings

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This commit is contained in:
jiangfangping 2024-07-09 15:35:42 +08:00
parent f05c85be0d
commit 512d418f7f
4 changed files with 15 additions and 12 deletions
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2
exercises/09_strings/strings1.rs
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@ -1,6 +1,6 @@
// TODO: Fix the compiler error without changing the function signature. // TODO: Fix the compiler error without changing the function signature.
fn current_favorite_color() -> String { fn current_favorite_color() -> String {
"blue" String::from("blue")
} }
fn main() { fn main() {

2
exercises/09_strings/strings2.rs
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@ -6,7 +6,7 @@ fn is_a_color_word(attempt: &str) -> bool {
fn main() { fn main() {
let word = String::from("green"); // Don't change this line. let word = String::from("green"); // Don't change 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.");

3
exercises/09_strings/strings3.rs
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@ -1,13 +1,16 @@
fn trim_me(input: &str) -> &str { fn trim_me(input: &str) -> &str {
// TODO: Remove whitespace from both ends of a string. // TODO: Remove whitespace from both ends of a string.
input.trim()
} }
fn compose_me(input: &str) -> String { fn compose_me(input: &str) -> String {
// TODO: Add " world!" to the string! There are multiple ways to do this. // TODO: Add " world!" to the string! There are multiple ways to do this.
format!("{} world!", input)
} }
fn replace_me(input: &str) -> String { fn replace_me(input: &str) -> String {
// TODO: Replace "cars" in the string with "balloons". // TODO: Replace "cars" in the string with "balloons".
input.replace("cars","balloons")
} }
fn main() { fn main() {

20
exercises/09_strings/strings4.rs
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@ -13,25 +13,25 @@ fn string(arg: String) {
// Your task is to replace `placeholder(…)` with either `string_slice(…)` // Your task is to replace `placeholder(…)` with either `string_slice(…)`
// or `string(…)` depending on what you think each value is. // or `string(…)` depending on what you think each value is.
fn main() { fn main() {
placeholder("blue"); string_slice("blue");
placeholder("red".to_string()); string("red".to_string());
placeholder(String::from("hi")); string(String::from("hi"));
placeholder("rust is fun!".to_owned()); string("rust is fun!".to_owned());
placeholder("nice weather".into()); string("nice weather".into());
placeholder(format!("Interpolation {}", "Station")); string(format!("Interpolation {}", "Station"));
// WARNING: This is byte indexing, not character indexing. // WARNING: This is byte indexing, not character indexing.
// Character indexing can be done using `s.chars().nth(INDEX)`. // Character indexing can be done using `s.chars().nth(INDEX)`.
placeholder(&String::from("abc")[0..1]); string_slice(&String::from("abc")[0..1]);
placeholder(" hello there ".trim()); string_slice(" hello there ".trim());
placeholder("Happy Monday!".replace("Mon", "Tues")); string("Happy Monday!".replace("Mon", "Tues"));
placeholder("mY sHiFt KeY iS sTiCkY".to_lowercase()); string("mY sHiFt KeY iS sTiCkY".to_lowercase());
} }