Ruby Guides 
Ruby Guides
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How do I use ‘case’ statements in Ruby?
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What is the ‘elsif’ statement in Ruby?
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How to use the ‘if’ statement in Ruby?
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What is a block in Ruby?
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How to define a method in Ruby?
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How to iterate through an array in Ruby?
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How to add elements to an array in Ruby?
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What is the difference between an array and a hash in Ruby?
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