mut_ref

Dragon-taro · Aug 22, 2019 · 8e355a7 · 8e355a7
1 parent 6840a2a
commit 8e355a7
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Showing 2 changed files with 6 additions and 6 deletions.
diff --git a/exercises/mutable_reference/Cargo.lock b/exercises/mutable_reference/Cargo.lock
diff --git a/exercises/mutable_reference/src/main.rs b/exercises/mutable_reference/src/main.rs
@@ -7,21 +7,21 @@
 */
 
 fn main() {
-    let (word_a, word_b) = words();
+    let (mut word_a, word_b) = words();
     println!("単語1：{:?}\n単語2：{:?}", word_a, word_b);
-    let text = concat(word_a, word_b);
+    let text = concat(&mut word_a, &word_b);
     println!("結合された結果：{:?}", text);
 }
 
 fn words() -> (String, String) {
     (format!("こんにちは"), format!("世界"))
 }
 
-fn concat(mut prefix: String, postfix: String) -> String {
+fn concat(prefix: &mut String, postfix: &String) -> String {
     prefix.push(' ');
     for c in postfix.chars() {
         prefix.push(c);
-    }
-    prefix
+}
+    prefix.to_string()
 }