make-a-function-that-does-arithmetic.md

Make a function that does arithmetic! ^{7 Kyu}

^{LINK TO THE KATA - FUNDAMENTALS}

Description

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!

Solutions

const arithmetic = (a, b, operator) => {
  const operations = {
    add: a + b,
    subtract: a - b,
    multiply: a * b,
    divide: a / b,
  }

  return operations[operator]
}

---

const arithmetic = (a, b, operator) => {
  return operator === 'add'
    ? a + b
    : operator === 'subtract'
    ? a - b
    : operator === 'multiply'
    ? a * b
    : a / b
}