2726-calculator-with-method-chaining.js

/**
 * 2726. Calculator with Method Chaining
 * https://leetcode.com/problems/calculator-with-method-chaining/
 * Difficulty: Easy
 *
 * Design a Calculator class. The class should provide the mathematical operations of addition,
 * subtraction, multiplication, division, and exponentiation. It should also allow consecutive
 * operations to be performed using method chaining. The Calculator class constructor should
 * accept a number which serves as the initial value of result.
 *
 * Your Calculator class should have the following methods:
 * - add - This method adds the given number value to the result and returns the updated Calculator.
 * - subtract - This method subtracts the given number value from the result and returns the
 *   updated Calculator.
 * - multiply - This method multiplies the result  by the given number value and returns the
 *   updated Calculator.
 * - divide - This method divides the result by the given number value and returns the updated
 *   Calculator. If the passed value is 0, an error "Division by zero is not allowed" should
 *   be thrown.
 * - power - This method raises the result to the power of the given number value and returns
 *   the updated Calculator.
 * - getResult - This method returns the result.
 *
 * Solutions within 10-5 of the actual result are considered correct.
 */

class Calculator {
  /**
   * @param {number} value
   */
  constructor(value) {
    this.value = value;
  }

  /**
   * @param {number} value
   * @return {Calculator}
   */
  add(value) {
    this.value += value;
    return this;
  }

  /**
   * @param {number} value
   * @return {Calculator}
   */
  subtract(value) {
    this.value -= value;
    return this;
  }

  /**
   * @param {number} value
   * @return {Calculator}
   */
  multiply(value) {
    this.value *= value;
    return this;
  }

  /**
   * @param {number} value
   * @return {Calculator}
   */
  divide(value) {
    if (value === 0) {
      throw new Error('Division by zero is not allowed');
    }
    this.value /= value;
    return this;
  }

  /**
   * @param {number} value
   * @return {Calculator}
   */
  power(value) {
    this.value **= value;
    return this;
  }

  /**
   * @return {number}
   */
  getResult() {
    return this.value;
  }
}