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8 commits

Author SHA1 Message Date
Kacper Poneta d91f14dc0e
Merge 59e8f70e55 into 26cf4989a2 2024-12-14 08:15:40 +09:00
Mo 26cf4989a2
Merge pull request #2173 from JoelMarcey/if2-comment-fix
Fix argument comment in test of if2.rs
2024-12-13 19:48:16 +01:00
Joel Marcey 6e60f441e9
Fix argument comment in test of if2.rs 2024-12-13 10:44:21 -08:00
mo8it 59e8f70e55 Format code 2024-07-12 18:31:23 +02:00
mo8it 4c8365fe88 Update dev/Cargo.toml 2024-07-12 18:25:01 +02:00
Kacper Poneta 52af0674c1 changed the task to make it more appropriate 2024-07-12 18:14:40 +02:00
Kacper Poneta 938b90e5f2 very small solution update 2024-07-11 22:55:48 +02:00
Kacper Poneta 55cc8584bd added exercise 2024-07-11 22:53:38 +02:00
5 changed files with 121 additions and 1 deletions

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@ -116,6 +116,8 @@ bin = [
{ name = "generics1_sol", path = "../solutions/14_generics/generics1.rs" },
{ name = "generics2", path = "../exercises/14_generics/generics2.rs" },
{ name = "generics2_sol", path = "../solutions/14_generics/generics2.rs" },
{ name = "generics3", path = "../exercises/14_generics/generics3.rs" },
{ name = "generics3_sol", path = "../solutions/14_generics/generics3.rs" },
{ name = "traits1", path = "../exercises/15_traits/traits1.rs" },
{ name = "traits1_sol", path = "../solutions/15_traits/traits1.rs" },
{ name = "traits2", path = "../exercises/15_traits/traits2.rs" },

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@ -19,7 +19,7 @@ mod tests {
#[test]
fn yummy_food() {
// This means that calling `picky_eater` with the argument "food" should return "Yummy!".
// This means that calling `picky_eater` with the argument "strawberry" should return "Yummy!".
assert_eq!(picky_eater("strawberry"), "Yummy!");
}

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@ -0,0 +1,54 @@
// generics3.rs
// Execute `rustlings hint generics3` or use the `hint` watch subcommand for a hint.
// This function should take an array of `Option` elements and returns array of not None elements
// TODO fix this function signature
fn into_dispose_nulls(list: Vec<Option<&str>>) -> Vec<&str> {
list.into_iter().flatten().collect()
}
fn main() {
// You can optionally experiment here.
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn store_str_on_list() {
let names_list = vec![Some("maria"), Some("jacob"), None, Some("kacper"), None];
let only_values = into_dispose_nulls(names_list);
assert_eq!(only_values.len(), 3);
}
#[test]
fn store_numbers_on_list() {
let numbers_list = vec![Some(1), Some(2), None, Some(3)];
let only_values = into_dispose_nulls(numbers_list);
assert_eq!(only_values.len(), 3);
}
#[test]
fn store_custom_type_on_list() {
#[allow(dead_code)]
struct Rectangle {
width: i32,
height: i32,
}
impl Rectangle {
fn new(width: i32, height: i32) -> Self {
Self { width, height }
}
}
let custom_list = vec![
Some(Rectangle::new(1, 2)),
None,
None,
Some(Rectangle::new(3, 4)),
];
let only_values = into_dispose_nulls(custom_list);
assert_eq!(only_values.len(), 2);
}
}

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@ -745,6 +745,17 @@ hint = """
Related section in The Book:
https://doc.rust-lang.org/book/ch10-01-syntax.html#in-method-definitions"""
[[exercises]]
name = "generics3"
dir = "14_generics"
hint = """
Vectors in Rust use generics to create dynamically-sized arrays of any type.
The `into_dispose_nulls` function takes a vector as an argument, but only accepts vectors that store the &str type.
To allow the function to accept vectors that store any type, you can leverage your knowledge about generics.
If you're unsure how to proceed, please refer to the Rust Book at:
https://doc.rust-lang.org/book/ch10-01-syntax.html#in-function-definitions.
"""
# TRAITS
[[exercises]]

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@ -0,0 +1,53 @@
// generics3.rs
// Execute `rustlings hint generics3` or use the `hint` watch subcommand for a hint.
// Here we added generic type `T` to function signature
// Now this function can be used with vector of any
fn into_dispose_nulls<T>(list: Vec<Option<T>>) -> Vec<T> {
list.into_iter().flatten().collect()
}
fn main() {
// You can optionally experiment here.
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn store_str_on_list() {
let names_list = vec![Some("maria"), Some("jacob"), None, Some("kacper"), None];
let only_values = into_dispose_nulls(names_list);
assert_eq!(only_values.len(), 3);
}
#[test]
fn store_numbers_on_list() {
let numbers_list = vec![Some(1), Some(2), None, Some(3)];
let only_values = into_dispose_nulls(numbers_list);
assert_eq!(only_values.len(), 3);
}
#[test]
fn store_custom_type_on_list() {
struct Rectangle {
width: i32,
height: i32,
}
impl Rectangle {
fn new(width: i32, height: i32) -> Self {
Self { width, height }
}
}
let custom_list = vec![
Some(Rectangle::new(1, 2)),
None,
None,
Some(Rectangle::new(3, 4)),
];
let only_values = into_dispose_nulls(custom_list);
assert_eq!(only_values.len(), 2);
}
}