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"));
  }
 })();