FAQ: Control Flow in Ruby - Unless

This community-built FAQ covers the “Unless” exercise from the lesson “Control Flow in Ruby”.

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This exercise can be found in the following Codecademy content:

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FAQs on the exercise Unless

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sometimes i use the print function with parenthesis.
how to combine parenthesis with the use of “unless”? i always get an error

Can you help me understand why I am not being able to print ‘Houston we have a problem’ even though I type in false when I am prompt?

print "True or False? "
problem = gets.chomp

unless problem
print “Houston we have a problem”
print “Not a problem!”

You are trying to compare a string input (“true”) to a boolean (true)
to make this work, turn the input into lowercase and compare it to the string “true” or “false” instead.

print "True or False? "
problem = gets.chomp

unless problem == "true"
print “Houston we have a problem”
print “Not a problem!”