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feat: complete iterators 1 & 2

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This commit is contained in:
Yedidya Rashi 2023-04-10 12:54:02 +03:00
parent 8bed288e05
commit 04f8d9dd13
2 changed files with 10 additions and 9 deletions
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10
exercises/iterators/iterators1.rs
View File

@ -8,17 +8,15 @@
// //
// Execute `rustlings hint iterators1` or use the `hint` watch subcommand for a hint. // Execute `rustlings hint iterators1` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn main() { fn main() {
let my_fav_fruits = vec!["banana", "custard apple", "avocado", "peach", "raspberry"]; let my_fav_fruits = vec!["banana", "custard apple", "avocado", "peach", "raspberry"];
let mut my_iterable_fav_fruits = ???; // TODO: Step 1 let mut my_iterable_fav_fruits = my_fav_fruits.iter(); // TODO: Step 1
assert_eq!(my_iterable_fav_fruits.next(), Some(&"banana")); 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(&"custard apple")); // TODO: Step 2
assert_eq!(my_iterable_fav_fruits.next(), Some(&"avocado")); 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(&"peach")); // TODO: Step 3
assert_eq!(my_iterable_fav_fruits.next(), Some(&"raspberry")); assert_eq!(my_iterable_fav_fruits.next(), Some(&"raspberry"));
assert_eq!(my_iterable_fav_fruits.next(), ???); // TODO: Step 4 assert_eq!(my_iterable_fav_fruits.next(), None); // TODO: Step 4
} }

9
exercises/iterators/iterators2.rs
View File

@ -12,7 +12,7 @@ pub fn capitalize_first(input: &str) -> String {
let mut c = input.chars(); let mut c = input.chars();
match c.next() { match c.next() {
None => String::new(), None => String::new(),
Some(first) => ???, Some(first) => first.to_uppercase().collect::<String>() + c.as_str(),
} }
} }
@ -21,7 +21,7 @@ pub fn capitalize_first(input: &str) -> String {
// Return a vector of strings. // Return a vector of strings.
// ["hello", "world"] -> ["Hello", "World"] // ["hello", "world"] -> ["Hello", "World"]
pub fn capitalize_words_vector(words: &[&str]) -> Vec<String> { pub fn capitalize_words_vector(words: &[&str]) -> Vec<String> {
vec![] words.iter().map(|s| capitalize_first(s)).collect()
} }
// Step 3. // Step 3.
@ -29,7 +29,10 @@ pub fn capitalize_words_vector(words: &[&str]) -> Vec<String> {
// Return a single string. // Return a single string.
// ["hello", " ", "world"] -> "Hello World" // ["hello", " ", "world"] -> "Hello World"
pub fn capitalize_words_string(words: &[&str]) -> String { pub fn capitalize_words_string(words: &[&str]) -> String {
String::new() words
.iter()
.map(|s| capitalize_first(s))
.collect()
} }
#[cfg(test)] #[cfg(test)]