arrow fn

src/07-funktionsprogrammierung/arrow.ts

@@ -0,0 +1,77 @@
+const add = (a: number, b: number) => {
+  return a + b;
+};
+
+console.log(add(2, 3));
+
+const multiply = (a: number, b: number): number => a * b;
+console.log(multiply(3, 4));
+
+class Counter {
+  count = 0;
+
+  // increment() {
+  //   setTimeout(function () {
+  //     console.log(this.count);
+  //   }, 1000)
+  // }
+  increment() {
+    setTimeout(() => {
+      console.log(this.count);
+    }, 200);
+  }
+}
+
+const counter = new Counter();
+counter.increment();
+
+function normalFunction() {
+  console.log(arguments);
+}
+
+normalFunction('a', 1, 3);
+
+const arrowFunction = (...args: any[]) => {
+  console.log(args);
+};
+
+arrowFunction('a', 33, true);
+
+class Person {
+  name = 'Alice';
+
+  sayHello = () => {
+    console.log(`Hallo, mein Name ist ${this.name}`);
+  };
+}
+
+const person = new Person();
+const greet = person.sayHello;
+greet();
+
+class Utils {
+  static normalFunction(value: string) {
+    return value.toUpperCase();
+  }
+
+  static arrowFunction = (value: string) => value.toLocaleLowerCase();
+}
+
+console.log(Utils.normalFunction('Hallo'));
+console.log(Utils.arrowFunction('Hallo'));
+
+class NormalMethodExample {
+  method() {
+    return 'Ich bin eine normale Methode.';
+  }
+}
+
+class ArrowFunctionExample {
+  method = () => 'Ich bin eine Arrow Function';
+}
+
+const obj1 = new NormalMethodExample();
+const obj2 = new ArrowFunctionExample();
+
+console.log(obj1.method === new NormalMethodExample().method);
+console.log(obj2.method === new ArrowFunctionExample().method);