+++ /dev/null
-mod word_utils;
-
-use std::collections::HashMap;
-
-use word_utils::{first_word, second_word};
-
-fn test_strings() {
- let s = String::from("Hello world");
- println!("first word: '{}'", first_word(&s));
- println!("second word: '{}'", second_word(&s).unwrap());
-
- let s2 = "hello dude blah";
- println!("second word of single: '{}'", second_word(s2).unwrap_or("(none)"));
-
- match second_word(s2) {
- Some(w) => println!("match: second word of '{}' exists: {}", s2, w),
- None => println!("match: second word of '{}' does not exist", s2),
- }
-}
-
-fn test_vectors() {
- let v1 = vec![1, 2, 3];
- println!("statically initialized vector: {:?}", v1);
-
- let mut v2: Vec<String> = Vec::new();
- v2.push("Hello".to_string());
- v2.push(String::from("world"));
- println!("dynamically built vector: {:?}", v2);
- println!("first element: {}", v2[0]);
- for el in &mut v2 {
- *el += "xx";
- }
- for el in &v2 {
- println!("{}", el);
- }
-}
-
-fn test_hashmaps() {
- let mut scores = HashMap::new();
- scores.insert("john", 10);
- scores.insert("mary", 20);
-
- println!("scores: {:?}", scores);
-
- // hash map with .collect()
- let persons = vec![("homer", 42), ("marge", 30)];
- let collect_scores: HashMap<_, _> = persons.into_iter().collect();
- println!("collect_scores: {:?}", collect_scores);
-
- for (p, s) in &collect_scores {
- println!("person {}: score {}", p, s);
- }
-
- println!("john's score: {}", scores.get("john").unwrap());
- println!("jake's score: {}", scores.get("jake").unwrap_or(&-1));
-
- // double scores
- for (_, v) in scores.iter_mut() {
- *v *= 2;
- }
- println!("scores after doubling: {:?}", scores);
-
- // double scores of immutable hashmap (rebuild it)
- let collect_scores: HashMap<_, _> = collect_scores.iter()
- .map(|(k, v)| (k, 2 * v))
- .collect();
- println!("collect_scores after rebuilding with doubling: {:?}", collect_scores);
-}
-
-fn main() {
- test_strings();
- test_vectors();
- test_hashmaps();
-}