Enumerable methods, duck typing, method_missing, define_method, open classes, gems and bundler.
35 cards · basic cards · AI-written, checked twice. Edit anything.
- What is Enumerable in Ruby?
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A mixin module that provides iteration methods for collections, including map, select, reduce, and many others.- What does the map method do?
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Iterates over each element and returns a new array with the results of the block applied to each element.- What does the select method do?
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Iterates over elements and returns a new array containing only elements for which the block returns true.- What does the reject method do?
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Returns a new array with elements for which the block returns false, opposite of select.- What does reduce (or inject) do?
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Combines elements of an enumerable into a single value by repeatedly applying a block.- What does the each method do?
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Iterates over each element, executing the block for each element, and returns the original collection.- What does find (or detect) return?
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The first element for which the block returns true, or nil if no match is found.- What does any? do?
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Returns true if at least one element matches the block condition, false otherwise.- What does all? do?
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Returns true if all elements match the block condition, false if any does not match.- What does include? check?
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Returns true if the enumerable contains the specified value, false otherwise.- What is duck typing?
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A programming style where an object is suitable for a task if it has the right methods, regardless of type or inheritance chain.- What does respond_to? check?
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Whether an object responds to a specified method name, returning true or false.- How does duck typing differ from static type checking?
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Duck typing checks behavior at runtime; static typing checks class membership at compile time.- What is a benefit of duck typing?
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Code works with any object that implements required methods, increasing reuse and flexibility.- What is method_missing?
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A private method called when an object receives a message for a method that does not exist.
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