Assignment: Using Function()

Your user has entered a new business rule on how to calculate this year's bonuses. He entered a formula through a web form and it is available through the string variable bonusFormula. The formula refers to the employee as employee like in employee.revenue * 0.2 (note that this only calculates but does not set the bonus)

Provide a function (or lambda expression) named bonusCalculation that calculates an employee's bonus by using the user-provided bonusFormula.

Since we will give bonuses to many employees, do NOT use the eval function and do NOT use side effects like setting surrounding variables.

const bonusCalculation = employee => {
    const calc = new Function('employee', `return ${bonusFormula}`);
    employee.bonus = calc(employee);
};

Your solution will be tested against:

const e = {revenue: 10000, bonus: null};
bonusCalculation(e);
e.bonus === e.revenue * factor_;