Javascript/4_chainCalculator.js at master · shreyaseebais/Javascript · GitHub

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/////////// Chain Calculator ///////////////

class ChainCalculator {
    constructor(value = 0) {
      this.value = value;
    }

    add(num) {
      this.value += num;
      return this; // Enable chaining
    }

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

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

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

    reset() {
      this.value = 0;
      return this;
    }

    getResult() {
      return this.value;
    }
  }


  const calculator = new ChainCalculator();
  const result = calculator
    .add(20)
    .subtract(5)
    .multiply(10)
    .divide(4)
    .getResult();

  console.log("Result :  ",  result);