Add exercise of multiply

chvmvd · chvmvd · commit c9c66027063e · 2023-10-19T09:07:35.000+09:00
diff --git a/docs/1-trial-session/09-functions/_samples/multiply/index.html b/docs/1-trial-session/09-functions/_samples/multiply/index.html
@@ -0,0 +1,10 @@
+<!doctype html>
+<html lang="ja">
+  <head>
+    <meta charset="utf-8" />
+    <title>2つの積 解答例</title>
+  </head>
+  <body>
+    <script src="./script.js"></script>
+  </body>
+</html>
diff --git a/docs/1-trial-session/09-functions/_samples/multiply/script.js b/docs/1-trial-session/09-functions/_samples/multiply/script.js
@@ -0,0 +1,6 @@
+function multiply(a, b) {
+  const result = a * b;
+  return result;
+}
+
+document.write(multiply(3, 4));
diff --git a/docs/1-trial-session/09-functions/index.md b/docs/1-trial-session/09-functions/index.md
@@ -83,6 +83,25 @@ function tryToDrive() {
 
 :::
 
+### 確認課題
+
+引数を 2 つとり、その積を<Term type="javascriptReturnValue">戻り値</Term>として<Term type="javascriptReturn">返す</Term><Term type="javascriptFunction">関数</Term> `multiply` を定義してください。
+
+<Answer type="2つの積">
+
+```javascript
+function multiply(a, b) {
+  const result = a * b;
+  return result;
+}
+
+document.write(multiply(3, 4));
+```
+
+<ViewSource url={import.meta.url} path="_samples/multiply" />
+
+</Answer>
+
 ## <Term type="javascriptVariable">変数</Term>の<Term type="javascriptScope">スコープ</Term>
 
 <p><Term type="javascriptFunction">関数</Term>内で<Term type="javascriptDeclaration">宣言</Term>された<Term type="javascriptVariable">変数</Term>は、<Term type="javascriptFunction">関数</Term>内でのみ有効です。<Term type="javascriptVariable">変数</Term>が有効な範囲のことを、その<Term type="javascriptVariable">変数</Term>の<Term type="javascriptScope" strong>スコープ</Term>と呼んでいます。</p>
