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feat: Refactor hint system

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Hints are now accessible using the CLI subcommand `rustlings hint
<exercise name`.

BREAKING CHANGE: This fundamentally changes the way people interact with exercises.
This commit is contained in:
marisa
2019-11-11 16:51:38 +01:00
parent 627cdc07d0
commit 9bdb0a12e4
47 changed files with 400 additions and 1681 deletions
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38
exercises/strings/strings1.rs
View File

@@ -1,5 +1,6 @@
// strings1.rs
// Make me compile without changing the function signature! Scroll down for hints :)
// Make me compile without changing the function signature!
// Execute `rustlings hint strings1` for hints ;)
fn main() {
let answer = current_favorite_color();
@@ -9,38 +10,3 @@ fn main() {
fn current_favorite_color() -> String {
"blue"
}
// 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.

32
exercises/strings/strings2.rs
View File

@@ -1,5 +1,6 @@
// strings2.rs
// Make me compile without changing the function signature! Scroll down for hints :)
// Make me compile without changing the function signature!
// Execute `rustlings hint strings2` for hints :)
fn main() {
let word = String::from("green"); // Try not changing this line :)
@@ -13,32 +14,3 @@ fn main() {
fn is_a_color_word(attempt: &str) -> bool {
attempt == "green" || attempt == "blue" || attempt == "red"
}
// Yes, it would be really easy to fix this by just changing the value bound to `word` to be a
// string slice instead of a `String`, wouldn't it?? There is a way to add one character to line
// 6, though, that will coerce the `String` into a string slice.