2026-10-20 10:40:15 +02:00
parent 8e7c8112a3
commit 490de9179b
1 changed files with 73 additions and 0 deletions
@@ -1,2 +1,75 @@
 (() => {
+  // src/04_never-void-unknown.ts
+  {
+    let infiniteLoop = function() {
+      while (true) {
+        console.log("This loop will never end");
+      }
+    };
+    const logMessage = (message) => {
+      console.log(message);
+    };
+    const logMessage2 = (message) => {
+      console.log(message);
+    };
+    logMessage("Hello, TypeScript!");
+    console.log(logMessage2("Hello, TypeScript!"));
+    const clearScreen = () => {
+    };
+    clearScreen();
+    const processInput = (input) => {
+      if (typeof input === "string") {
+        console.log(`The input is a string: ${input.toUpperCase()}`);
+      } else if (typeof input === "number") {
+        console.log(`The input is a number: ${input + 10}`);
+      } else {
+        console.log("Unknown type of input");
+      }
+    };
+    processInput("Hello");
+    processInput(42);
+    processInput(true);
+    const getPersonAsync = async () => {
+      try {
+        const res = await fetch("https://dummyjson.com/users/1?select=firstName,lastName,age");
+        if (!res.ok) {
+          throw Error(`HTTP-Request went wrong: ${res.status}`);
+        }
+        const data = await res.json();
+        return data;
+      } catch (err) {
+        if (err instanceof Error) {
+          console.log(err.message);
+          console.error(err);
+          throw err;
+        }
+        throw new Error("An unknown error occurred.");
+      }
+    };
+    getPersonAsync().then((data) => console.log(data));
+    const safeParse = (s) => {
+      return JSON.parse(s);
+    };
+    const result = safeParse('{"name": "Alice"}');
+    if (typeof result === "object" && result !== null && "name" in result) {
+      console.log(result.name);
+    }
+    const throwError = (message) => {
+      throw new Error(message);
+    };
+    throwError("Something went wrong!");
+    const handleShape = (shape) => {
+      switch (shape) {
+        case "circle":
+          return "Handling a circle";
+        case "square":
+          return "Handling a square";
+        default:
+          const _exhaustiveCheck = shape;
+          return _exhaustiveCheck;
+      }
+    };
+    console.log(handleShape("circle"));
+    console.log(handleShape("square"));
+  }
 })();