CoffeeScript in Action

Appendix B. Answers to exercises

About the exercises

These exercises are provided for you to practice using CoffeeScript and also to spend some time reflecting on CoffeeScript. These two activities are an essential component of learning a new programming language. Attempting the exercises is more important than looking at the solutions.

Exercise 2.3.3

torch = price: 21
umbrella = {}
combinedCost = (torch.price || 0) + (umbrella.price || 0)
# 21

Exercise 2.4.4

animal = "crocodile"
collective = switch animal
  when "antelope" then "herd"
  when "baboon" then "rumpus"
  when "badger" then "cete"
  when "cobra" then "quiver"
  when "crocodile" then "bask"
# bask

Exercise 2.5.3

animal = "cobra" collective = switch animal when "antelope" then "herd" when ...