New JS Decorators

decorators.js

function log(originalMethod: any, _context: any) {
  function replacementMethod(this: any, ...args: any[]) {
    // const startTime = performance.now();
    console.log(`${originalMethod.name} START`);
    const result = originalMethod.call(this, ...args);
    console.log(`${originalMethod.name} END`);
    // const endTime = performance.now();
    // console.log(`Method ${originalMethod.name} took ${endTime - startTime} milliseconds`);
    return "result: " + result;
  }

  return replacementMethod;
}

class Animal {
  #name: string;

  constructor(name: string) {
    this.#name = name;
  }

  get name() {
    return this.#name;
  }

  @log
  makeSound(): string {
    // let sound = "Sound";
    console.log("running makeSound");
    // if (this.#name === "Dog") sound = "Bark";
    // return sound;
    return "Sound";
  }
}

const animal = new Animal("Dog");
const sound = animal.makeSound();

console.log(sound);