Cookie の利用セクションを更新

Author: chelproc

docs/4-advanced/01-cookie/_samples/cookie-counter/.gitignore

@@ -0,0 +1 @@
+/node_modules

docs/4-advanced/01-cookie/_samples/cookie-counter/main.mjs

@@ -0,0 +1,16 @@
+import express from "express";
+import cookieParser from "cookie-parser";
+
+const app = express();
+app.use(cookieParser());
+
+app.get("/", (request, response) => {
+  // Cookieの値は文字列なので数値に変換が必要
+  const count = Number.parseInt(request.cookies.count) || 0;
+  const newCount = count + 1;
+  // 変更後の値をレスポンスヘッダに乗せる
+  response.cookie("count", newCount.toString());
+  response.send(`${newCount}回目のアクセスですね。`);
+});
+
+app.listen(3000);