arithmeticFunction.js

// Given two numbers and an arithmetic operator (the name of it, as a string), return the result of the two numbers having that operator used on them.

// a and b will both be positive integers, and a will always be the first number in the operation, and b always the second.

// The four operators are "add", "subtract", "divide", "multiply".

// A few examples:(Input1, Input2, Input3 --> Output)

// 5, 2, "add"      --> 7
// 5, 2, "subtract" --> 3
// 5, 2, "multiply" --> 10
// 5, 2, "divide"   --> 2.5
// Try to do it without using if statements!

// my original solution

function arithmetic(a, b, operator) {
  switch (operator) {
    case 'add':
      return a + b;
    case 'subtract':
      return a - b;
    case 'multiply':
      return a * b;
    case 'divide':
      return a / b;
  }
}

// what I learned from others' solutions

const arithmetic = (a, b, operator) =>
  ({
    add: a + b,
    subtract: a - b,
    multiply: a * b,
    divide: a / b,
  }[operator]); // creating an object with each option and passing the operator to that object to return the correct arithmetic