finish chapter 8

1 files changed, 30 insertions, 0 deletions

diff --git a/rust/theBook/chapter-8-common-collections/hash/src/main.rs b/rust/theBook/chapter-8-common-collections/hash/src/main.rs
new file mode 100644
index 0000000..d1e9a4c
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/hash/src/main.rs
@@ -0,0 +1,30 @@
+use std::collections::HashMap as hm;
+
+fn main() {
+    let mut scores = hm::new();
+
+    scores.insert(String::from("yellow"),10);
+    scores.insert(String::from("blue"),50);
+
+    let tm = String::from("blue");
+
+    let score = scores.get(&tm).copied().unwrap_or(0);
+
+    println!("{score}");
+
+    count_word();
+}
+
+
+fn count_word() {
+    let text = "hello world wonderful world";
+
+    let mut hp = hm::new();
+
+    for word in text.split_whitespace() {
+        let count = hp.entry(word).or_insert(0);  // or_insert return reference
+        *count += 1;
+    }
+
+    println!("{:#?}", hp);
+}