Ruby Guides 
Ruby Guides
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What is the ‘ARGV’ array in Ruby?
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How to access command-line arguments in Ruby?
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How to create and use a custom exception in Ruby?
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What is the ‘require’ keyword in Ruby?
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How to use the ‘unless’ statement in Ruby?
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How to define a constant in Ruby?
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What is the ‘do…end’ block in Ruby?
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How to use ‘yield’ in Ruby?
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