2726-calculator-with-method-chaining

2726. Calculator with Method Chaining (Easy) (https://leetcode.com/problems/calculator-with-method-chaining/)

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: adds the given number value to the result and returns the updated Calculator.

• subtract: subtracts the given number value from the result and returns the updated Calculator.
• multiply: multiplies the result by the given number value and returns the updated Calculator.
• divide: 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: raises the result to the power of the given number value and returns the updated Calculator.
• getResult: returns the result. Solutions within 10^-5 of the actual result are considered correct. Constraints: - actions is a valid JSON array of strings - values is a valid JSON array of numbers - 2 <= actions.length <= 2 * 10^4 - 1 <= values.length <= 2 * 10^4 - 1 - actions[i] is one of “Calculator”, “add”, “subtract”, “multiply”, “divide”, “power”, and “getResult” - First action is always “Calculator” - Last action is always “getResult”

class Calculator {
  value: number
 
  constructor(value: number) {
    this.value = value
  }
 
  add(value: number): Calculator {
    this.value += value
    return this
  }
 
  subtract(value: number): Calculator {
    this.value -= value
    return this
  }
 
  multiply(value: number): Calculator {
    this.value *= value
    return this
  }
 
  divide(value: number): Calculator {
    if (value === 0)
      throw new Error('Division by zero is not allowed')
    this.value /= value
    return this
  }
 
  power(value: number): Calculator {
    this.value **= value
    return this
  }
 
  getResult(): number {
    return this.value
  }
}
 
//  Local check:
 
console.log(new Calculator(10).add(5).subtract(7).getResult()) // 8
console.log(new Calculator(2).multiply(5).power(2).getResult()) // 100

Example 1:
 
    Input:
    actions = ["Calculator", "add", "subtract", "getResult"],
    values = [10, 5, 7]
 
<!-- [[leetcode/untagged]] [[leetcode/untagged/2725-interval-cancellation]] -->
    Output: 8
    Explanation:
    new Calculator(10).add(5).subtract(7).getResult() // 10 + 5 - 7 = 8
 
  Example 2:
 
    Input:
    actions = ["Calculator", "multiply", "power", "getResult"],
    values = [2, 5, 2]
    Output: 100
    Explanation:
    new Calculator(2).multiply(5).power(2).getResult() // (2 * 5) ^ 2 = 100
 
  Example 3:
 
    Input:
    actions = ["Calculator", "divide", "getResult"],
    values = [20, 0]
    Output: "Division by zero is not allowed"
    Explanation:
    new Calculator(20).divide(0).getResult() // 20 / 0
 
    The error should be thrown because we cannot divide by zero.