calculator

class Calculator {
  constructor() {
    this.result = 0;
  }

  add(num) {
    this.result += num;
    return this;
  }

  subtract(num) {
    this.result -= num;
    return this;
  }

  multiply(num) {
    this.result *= num;
    return this;
  }

  divide(num) {
    if (num === 0) {
      throw new Error("Cannot divide by zero");
    }
    this.result /= num;
    return this;
  }

  getResult() {
    return this.result;
  }
}

// Test method chaining
const calc = new Calculator();
const result = calc.add(5).multiply(2).subtract(3).divide(2).getResult();
console.log(result); // Output: 4