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Freelancer Rates

Welcome to Freelancer Rates on Exercism's JavaScript Track. If you need help running the tests or submitting your code, check out HELP.md. If you get stuck on the exercise, check out HINTS.md, but try and solve it without using those first :)

Introduction

Many programming languages have specific numeric types to represent different types of numbers, but JavaScript only has two:

  • number: a numeric data type in the double-precision 64-bit floating point format (IEEE 754). Examples are -6, -2.4, 0, 0.1, 1, 3.14, 16.984025, 25, 976, 1024.0 and 500000.
  • bigint: a numeric data type that can represent integers in the arbitrary precision format. Examples are -12n, 0n, 4n, and 9007199254740991n.

If you require arbitrary precision or work with extremely large numbers, use the bigint type. Otherwise, the number type is likely the better option.

Instructions

In this exercise you will be writing code to help a freelancer communicate with a project manager by providing a few utility functions to quickly calculate day- and month rates, optionally with a given discount.

We first establish a few rules between the freelancer and the project manager:

  • The daily rate is 8 times the hourly rate;
  • A month has 22 billable days.

If the freelancer bills the project manager per month, there is a discount applied. This can be handy if the project manager has a fixed budget.

Discounts are modeled as fractional numbers (percentage) between 0.0 (0%, no discount) and 0.90 (90%, maximum discount).

1. Calculate the day rate given an hourly rate

Implement a function to calculate the day rate given an hourly rate:

dayRate(89);
// => 712

The day rate does not need to be rounded or changed to a "fixed" precision.

2. Calculate the month rate, given an hourly rate and a discount

Implement a function to calculate the month rate, and apply a discount:

monthRate(89, 0.42);
// => 9086

The discount is always passed as a number, where 42% becomes 0.42. The result must be rounded up to the nearest whole number.

3. Calculate the number of workdays given a budget, rate and discount

Implement a function that takes a budget, a rate per hour and a discount, and calculates how many full days of work that covers.

daysInBudget(20000, 89, 0.2002);
// => 35

The discount is always passed as a number. 20.02% is passed as 0.2002. The result is the number of days should be rounded down to full days of work.

Source

Created by

  • @SleeplessByte