[leetcode][JS] 2726. Calculator with Method Chaining

문제

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.

• 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.

• Your Calculator class should have the following methods:

https://leetcode.com/problems/calculator-with-method-chaining/

 

예시

 

코드

const DIVISION_ZERO_ERROR = "Division by zero is not allowed";

class Calculator {
    
    /** 
     * @param {number} value
     */
    constructor(value) {
        this.value = value;
    }
    
    /** 
     * @param {number} value
     * @return {Calculator}
     */
    add(value){
        this.value += value;
        console.log(this);
        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_ZERO_ERROR);
        this.value /= value;
        return this;
    }
    
    /** 
     * @param {number} value
     * @return {Calculator}
     */
    power(value) {
        this.value = this.value ** value;
        return this;
    }
    
    /** 
     * @return {number}
     */
    getResult() {
        return this.value;
    
    }
}

 

메소드 체이닝을 위해서는 각 메소드에서 this를 반환하여 Calculator 클래스 자체를 반환해주어야 한다. 따라서 생성자 함수인 constructor()와 연산 결과를 리턴할 getResult() 메소드를 제외한 나머지 메소드에서 this를 리턴해주었다.