cmkoller/workout_analyzer_clinic

Livecode clinic demonstrating Ruby classes

Learning Goals

• Get more practice building Ruby classes.

Instructions

Because you are a huge nerd and you like working out (let's pretend), you've decided to track all your workouts in the workouts.csv file. Now you want to write an object-oriented program that will run some analytics on your data.

Specifically, you want a program that when run will output the following summary given the data in the CSV:

ID | DATE       | TYPE     | DURATION | CALORIES_BURNED
---|------------|----------|----------|----------------
1  | 2014-08-15 | strength | 17.5     | 120.5
2  | 2014-08-16 | cardio   | 40.0     | 320.0
3  | 2014-08-17 | cardio   | 43.0     | 344.0
4  | 2014-08-20 | cardio   | 35.0     | 280.0
5  | 2014-08-22 | strength | 34.5     | 246.0
6  | 2014-08-23 | other    | 90.0     | 450.0

Define a Workout class that encapsulates the necessary data and the methods that calculate this information.

Some hints:

• A workout should be categorized as a "cardio" workout if at least 50% of the exercises were cardio exercises. It is a "strength" workout if at least 50% of the exercises were strength exercises. Otherwise, it should be categorized as "other".
• "Duration" should add up the duration of all of the exercises in a given workout.
• For calories burned, assume the following:
  • cardio exercises burn 8 calories/min
  • all other exercises burn 5 calories/min
• You can use the table_print gem to print out tables in your console.

Setup

You'll want two files in your app: a file that defines the Workout class, called workout.rb, and a file that will load in the workout data from the CSV and output the workout summary when run in the terminal, called workout_summary.rb. Save the following code in the workout_summary.rb file:

require_relative 'workout'
require 'csv'

# create an array of Workout objects
def load_workout_data(filename)
  workouts = []

  CSV.foreach(filename, headers: true, header_converters: :symbol, converters: :numeric) do |row|
    workout = workouts.find { |wo| wo.id == row[:workout_id] }

    if workout.nil?
      workout = Workout.new(row[:workout_id], row[:date])
      workouts << workout
    end

    exercise = {
      name: row[:exercise],
      category: row[:category],
      duration_in_min: row[:duration_in_min]
    }

    workout.exercises << exercise
  end

  workouts
end

# YOUR CODE HERE

In the workout.rb file, add the following code:

class Workout
  # YOUR CODE HERE
end

Extra Challenge

Create an Exercise class. An exercise object should have the following attributes:

• workout_id
• name
• category
• duration_in_min

A Workout object should have an @exercises instance variable that is an array of Exercise objects.