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@ -116,6 +116,8 @@ bin = [
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{ name = "generics1_sol", path = "../solutions/14_generics/generics1.rs" },
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{ name = "generics2", path = "../exercises/14_generics/generics2.rs" },
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{ name = "generics2_sol", path = "../solutions/14_generics/generics2.rs" },
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{ name = "generics3", path = "../exercises/14_generics/generics3.rs" },
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{ name = "generics3_sol", path = "../solutions/14_generics/generics3.rs" },
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{ name = "traits1", path = "../exercises/15_traits/traits1.rs" },
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{ name = "traits1_sol", path = "../solutions/15_traits/traits1.rs" },
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{ name = "traits2", path = "../exercises/15_traits/traits2.rs" },
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@ -6,7 +6,7 @@
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// must add fruit to the basket so that there is at least one of each kind and
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// more than 11 in total - we have a lot of mouths to feed. You are not allowed
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// to insert any more of the fruits that are already in the basket (Apple,
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// Mango, and Lyche).
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// Mango, and Lychee).
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use std::collections::HashMap;
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54
exercises/14_generics/generics3.rs
Normal file
54
exercises/14_generics/generics3.rs
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@ -0,0 +1,54 @@
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// generics3.rs
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// Execute `rustlings hint generics3` or use the `hint` watch subcommand for a hint.
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// This function should take an array of `Option` elements and returns array of not None elements
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// TODO fix this function signature
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fn into_dispose_nulls(list: Vec<Option<&str>>) -> Vec<&str> {
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list.into_iter().flatten().collect()
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}
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fn main() {
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// You can optionally experiment here.
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn store_str_on_list() {
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let names_list = vec![Some("maria"), Some("jacob"), None, Some("kacper"), None];
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let only_values = into_dispose_nulls(names_list);
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assert_eq!(only_values.len(), 3);
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}
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#[test]
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fn store_numbers_on_list() {
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let numbers_list = vec![Some(1), Some(2), None, Some(3)];
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let only_values = into_dispose_nulls(numbers_list);
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assert_eq!(only_values.len(), 3);
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}
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#[test]
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fn store_custom_type_on_list() {
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#[allow(dead_code)]
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struct Rectangle {
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width: i32,
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height: i32,
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}
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impl Rectangle {
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fn new(width: i32, height: i32) -> Self {
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Self { width, height }
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}
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}
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let custom_list = vec![
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Some(Rectangle::new(1, 2)),
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None,
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None,
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Some(Rectangle::new(3, 4)),
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];
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let only_values = into_dispose_nulls(custom_list);
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assert_eq!(only_values.len(), 2);
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}
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}
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@ -741,6 +741,17 @@ hint = """
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Related section in The Book:
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https://doc.rust-lang.org/book/ch10-01-syntax.html#in-method-definitions"""
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[[exercises]]
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name = "generics3"
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dir = "14_generics"
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hint = """
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Vectors in Rust use generics to create dynamically-sized arrays of any type.
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The `into_dispose_nulls` function takes a vector as an argument, but only accepts vectors that store the &str type.
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To allow the function to accept vectors that store any type, you can leverage your knowledge about generics.
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If you're unsure how to proceed, please refer to the Rust Book at:
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https://doc.rust-lang.org/book/ch10-01-syntax.html#in-function-definitions.
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"""
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# TRAITS
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[[exercises]]
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@ -5,7 +5,8 @@
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// Apple (4), Mango (2) and Lychee (5) are already in the basket hash map. You
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// must add fruit to the basket so that there is at least one of each kind and
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// more than 11 in total - we have a lot of mouths to feed. You are not allowed
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// to insert any more of these fruits!
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// to insert any more of the fruits that are already in the basket (Apple,
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// Mango, and Lychee).
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use std::collections::HashMap;
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53
solutions/14_generics/generics3.rs
Normal file
53
solutions/14_generics/generics3.rs
Normal file
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@ -0,0 +1,53 @@
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// generics3.rs
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// Execute `rustlings hint generics3` or use the `hint` watch subcommand for a hint.
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// Here we added generic type `T` to function signature
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// Now this function can be used with vector of any
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fn into_dispose_nulls<T>(list: Vec<Option<T>>) -> Vec<T> {
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list.into_iter().flatten().collect()
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}
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fn main() {
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// You can optionally experiment here.
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn store_str_on_list() {
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let names_list = vec![Some("maria"), Some("jacob"), None, Some("kacper"), None];
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let only_values = into_dispose_nulls(names_list);
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assert_eq!(only_values.len(), 3);
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}
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#[test]
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fn store_numbers_on_list() {
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let numbers_list = vec![Some(1), Some(2), None, Some(3)];
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let only_values = into_dispose_nulls(numbers_list);
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assert_eq!(only_values.len(), 3);
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}
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#[test]
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fn store_custom_type_on_list() {
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struct Rectangle {
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width: i32,
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height: i32,
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}
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impl Rectangle {
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fn new(width: i32, height: i32) -> Self {
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Self { width, height }
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}
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}
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let custom_list = vec![
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Some(Rectangle::new(1, 2)),
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None,
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None,
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Some(Rectangle::new(3, 4)),
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];
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let only_values = into_dispose_nulls(custom_list);
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assert_eq!(only_values.len(), 2);
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}
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}
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