My Ruby Litmus Test.rb

Ruby Basic

# Integer vs Float div by zero gotchas
#
#
1 / 0 = [answer]
1.0 / 0 = [answer]
1 / 0.0 = [answer]
0 / 0.0 = [answer]

# String concatenation vs interpolation
x = 5
"Num = #{x}"  # Whats the output and why?
"Num = " + x  # whats the output and why?

# Arrays
[1,2,3,4 ... 1,000] # return all the evens

# Modules vs Classes: Questions
#
# What are some differences between a module and a class?

# What are the two canonical uses for modules?

# What are your 2 favorite methods in Enumerable?

# Whats the difference between extend and include?
# Bonus: What is the name of the include hook method?

# What are the differences between a string and a symbol?
# Bonus: Why might a symbol be used as a hash key?
# Bonus * 2: How long does a symbol stay in memory?

# Use the following code ./person.rb
class Person
  def salutation
    "Hello"
  end
end

# Write an initializer to satisfy these tests
Person.new.salutation == "Hello"
Person.new("Bonjour").salutation == "Bonjour"
Person.new("Hola").salutation == "Hola"
 
# Make this test pass
Person.new.salutation == "Gutan Tag"

# Without opening the class make this test pass
Person.new.good_bye == "Laters!"

# Bonus Questions which stopped being asked
# Given: [1,2,3].inject(:+) == 6, how does this work?