diff options
| -rw-r--r-- | exercises/18_iterators/iterators1.rs | 21 | ||||
| -rw-r--r-- | rustlings-macros/info.toml | 15 | ||||
| -rw-r--r-- | solutions/18_iterators/iterators1.rs | 27 |
3 files changed, 36 insertions, 27 deletions
diff --git a/exercises/18_iterators/iterators1.rs b/exercises/18_iterators/iterators1.rs index 52b704d..86278a4 100644 --- a/exercises/18_iterators/iterators1.rs +++ b/exercises/18_iterators/iterators1.rs @@ -1,8 +1,6 @@ // When performing operations on elements within a collection, iterators are // essential. This module helps you get familiar with the structure of using an // iterator and how to go through elements within an iterable collection. -// -// Make me compile by filling in the `???`s fn main() { // You can optionally experiment here. @@ -10,19 +8,18 @@ fn main() { #[cfg(test)] mod tests { - use super::*; - #[test] fn iterators() { - let my_fav_fruits = vec!["banana", "custard apple", "avocado", "peach", "raspberry"]; + let my_fav_fruits = ["banana", "custard apple", "avocado", "peach", "raspberry"]; - let mut my_iterable_fav_fruits = ???; // TODO: Step 1 + // TODO: Create an iterator over the array. + let mut fav_fruits_iterator = ???; - assert_eq!(my_iterable_fav_fruits.next(), Some(&"banana")); - assert_eq!(my_iterable_fav_fruits.next(), ???); // TODO: Step 2 - assert_eq!(my_iterable_fav_fruits.next(), Some(&"avocado")); - assert_eq!(my_iterable_fav_fruits.next(), ???); // TODO: Step 3 - assert_eq!(my_iterable_fav_fruits.next(), Some(&"raspberry")); - assert_eq!(my_iterable_fav_fruits.next(), ???); // TODO: Step 4 + assert_eq!(fav_fruits_iterator.next(), Some(&"banana")); + assert_eq!(fav_fruits_iterator.next(), ???); // TODO: Replace `???` + assert_eq!(fav_fruits_iterator.next(), Some(&"avocado")); + assert_eq!(fav_fruits_iterator.next(), ???); // TODO: Replace `???` + assert_eq!(fav_fruits_iterator.next(), Some(&"raspberry")); + assert_eq!(fav_fruits_iterator.next(), ???); // TODO: Replace `???` } } diff --git a/rustlings-macros/info.toml b/rustlings-macros/info.toml index 5c24cd3..5e93986 100644 --- a/rustlings-macros/info.toml +++ b/rustlings-macros/info.toml @@ -886,22 +886,9 @@ https://doc.rust-lang.org/stable/book/ch11-01-writing-tests.html#checking-for-pa name = "iterators1" dir = "18_iterators" hint = """ -Step 1: - -We need to apply something to the collection `my_fav_fruits` before we start to -go through it. What could that be? Take a look at the struct definition for a -vector for inspiration: -https://doc.rust-lang.org/std/vec/struct.Vec.html - -Step 2 & step 3: - -Very similar to the lines above and below. You've got this! - -Step 4: - An iterator goes through all elements in a collection, but what if we've run out of elements? What should we expect here? If you're stuck, take a look at -https://doc.rust-lang.org/std/iter/trait.Iterator.html for some ideas.""" +https://doc.rust-lang.org/std/iter/trait.Iterator.html""" [[exercises]] name = "iterators2" diff --git a/solutions/18_iterators/iterators1.rs b/solutions/18_iterators/iterators1.rs index 4e18198..93a6008 100644 --- a/solutions/18_iterators/iterators1.rs +++ b/solutions/18_iterators/iterators1.rs @@ -1 +1,26 @@ -// Solutions will be available before the stable release. Thank you for testing the beta version 🥰 +// When performing operations on elements within a collection, iterators are +// essential. This module helps you get familiar with the structure of using an +// iterator and how to go through elements within an iterable collection. + +fn main() { + // You can optionally experiment here. +} + +#[cfg(test)] +mod tests { + #[test] + fn iterators() { + let my_fav_fruits = ["banana", "custard apple", "avocado", "peach", "raspberry"]; + + // Create an iterator over the array. + let mut fav_fruits_iterator = my_fav_fruits.iter(); + + assert_eq!(fav_fruits_iterator.next(), Some(&"banana")); + assert_eq!(fav_fruits_iterator.next(), Some(&"custard apple")); + assert_eq!(fav_fruits_iterator.next(), Some(&"avocado")); + assert_eq!(fav_fruits_iterator.next(), Some(&"peach")); + assert_eq!(fav_fruits_iterator.next(), Some(&"raspberry")); + assert_eq!(fav_fruits_iterator.next(), None); + // ^^^^ reached the end + } +} |