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Q. How do you define a lambda in Ruby?
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Q. What is the purpose of the be_a matcher in RSpec?
Q. Which method is used to check if a block has been passed to a Ruby method?
Q. Which operator is used for exponentiation in Ruby?
Q. What does the arity method return for a proc or lambda in Ruby?
Q. How do you find the number of seconds between two Time objects in Ruby?
Q. Which Ruby module is commonly used for memoization?
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