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Course 2000032
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What happens if you call "yield" in a method but no block was given?
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Can a method yield multiple values to a block, like yield(a, b)?
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Which values are falsy in Ruby?
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Is an empty array [] truthy or falsy?
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What is the key difference between .map and .each?
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What does .reduce({}) { |acc, (k, v)| acc[k] = v * 2; acc } do when applied to a hash?
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Which is generally more memory-efficient for repeated use as hash keys: Symbol or String?
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Why are symbols often preferred over strings for hash keys in performance-sensitive code?
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What does "extend" do when used with a module?
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What keyword defines a module in Ruby?
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