week_3.markdown

Module 1 Week 3 Diagnostic.

• What do we mean when we talk about a variable's "scope"?
• Given the following code, what does the program output?

		def combine_variables(x)
		  puts "inner x is: #{x}"
		  puts "and outer b is: #{b}"
		end
		
		def b
		  12
		end
		
		a = 4
		combine_variables(a)

• What is the value of hero after this code has executed?

		new_creatures = ["IntrepidDecomposedCyclist", "Dragon"]
		villain = "AssistantViceTentacleAndOmbudsman"
		hero = "who knows"
		
		new_creatures.each do |villain|
		  hero = "Dwemthy"
		  puts "this time the villain is #{villain} and the hero is #{hero}"
		end

• What is a "handle" in terms of File I/O?

• What is the difference between "w", "r", and "a" modes in File I/O?

• Imagine we're writing software to model a Corgi dog. You don't need to write the implementation, but write a test for each of the following features:

• A Corgi has a name.

• A Corgi has an age.

• A Corgi can lie down.

• A Corgi can stand up.

• A Corgi cannot lie down when already lying down.

• A Corgi cannot stand when it is already standing.

• A Corgi starts hungry.

• A Corgi can eat, but only when it is hungry.

• A Corgi is no longer hungry when it has eaten three times.