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Add some exercises about Strings and &strs!
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| // Make me compile without changing the function signature! Scroll down for hints :) | ||
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| fn main() { | ||
| let answer = current_favorite_color(); | ||
| println!("My current favorite color is {}", answer); | ||
| } | ||
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| fn current_favorite_color() -> String { | ||
| "blue" | ||
| } | ||
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| // The `current_favorite_color` function is currently returning a string slice with the `'static` | ||
| // lifetime. We know this because the data of the string lives in our code itself -- it doesn't | ||
| // come from a file or user input or another program -- so it will live as long as our program | ||
| // lives. But it is still a string slice. There's one way to create a `String` by converting a | ||
| // string slice covered in the Strings chapter of the book, and another way that uses the `From` | ||
| // trait. |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,42 @@ | ||
| // Make me compile without changing the function signature! Scroll down for hints :) | ||
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| fn main() { | ||
| let guess1 = "blue".to_string(); // Try not changing this line :) | ||
| let correct = guess_favorite_color(guess1); | ||
| if correct { | ||
| println!("You guessed correctly!"); | ||
| } else { | ||
| println!("Nope, that's not it."); | ||
| } | ||
| } | ||
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| fn guess_favorite_color(attempt: &str) -> bool { | ||
| attempt == "green" | ||
| } | ||
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| // Yes, it would be really easy to fix this by just changing the value bound to `guess1` to be a | ||
| // string slice instead of a `String`, wouldn't it?? There is a way to add one character to line | ||
| // 5, though, that will coerce the `String` into a string slice. |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| // Ok, here are a bunch of values-- some are `Strings`, some are `&strs`. Your | ||
| // task is to call one of these two functions on each value depending on what | ||
| // you think each value is. That is, add either `string_slice` or `string` | ||
| // before the parentheses on each line. If you're right, it will compile! | ||
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| fn string_slice(arg: &str) { println!("{}", arg); } | ||
| fn string(arg: String) { println!("{}", arg); } | ||
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| fn main() { | ||
| ("blue"); | ||
| ("red".to_string()); | ||
| (String::from("hi")); | ||
| (format!("Interpolation {}", "Station")); | ||
| (&String::from("abc")[0..1]); | ||
| (" hello there ".trim()); | ||
| ("Happy Monday!".to_string().replace("Mon", "Tues")); | ||
| ("mY sHiFt KeY iS sTiCkY".to_lowercase()); | ||
| } |