SimpleCalculator

simpleCalculator = (num1, num2, operator) => {
    let MyMath = {
        multiply: (n1, n2) => n1 * n2,
        divide: (n1, n2) => n1 / n2,
        add: (n1, n2) => n1 + n2,
        subtract: (n1, n2) => n1 - n2
    };
    console.log(MyMath[operator](num1, num2));
};