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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/functions/functions5.rs
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@ -1,5 +1,5 @@
// functions5.rs
// Make me compile! Scroll down for hints :)
// Make me compile! Execute `rustlings hint functions5` for hints :)
fn main() {
let answer = square(3);
@ -9,39 +9,3 @@ fn main() {
fn square(num: i32) -> i32 {
num * num;
}
// This is a really common error that can be fixed by removing one character.
// It happens because Rust distinguishes between expressions and statements: expressions return
// a value based on its operand, and statements simply return a () type which behaves just like `void` in C/C++ language.
// We want to return a value of `i32` type from the `square` function, but it is returning a `()` type...
// They are not the same. There are two solutions:
// 1. Add a `return` ahead of `num * num;`
// 2. remove `;`, make it to be `num * num`