How to list all methods of Array in Ruby programmatically?

Question

I want to list all methods of Array in Ruby. How do I approach that?

Answer 1

Class methods like Array.try_convert can be listed via Objects#methods

Array.methods
#=> [:try_convert, :[], :allocate, :superclass, :new, :<=>, :<=, :>=, :==, ...]

It returns many additional methods because ( Array being in instance of Class ) it also includes the instance methods from Class . To get only the Array specific class methods, we can pass false :

Array.methods(false)
#=> [:try_convert, :[]]

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Instance methods like Array#at can be listed via Module#instance_methods :

Array.instance_methods
#=> [:to_h, :include?, :at, :fetch, :last, ..., :instance_eval, :__id__, :__send__]

Again, we can pass false to exclude the inherited methods:

Array.instance_methods(false)
#=> [:to_h, :include?, :at, :fetch, :last, ..., :slice, :slice!, :dig, :hash]

Answer 2

 p Array.instance_methods(false)

这将列出数组的所有实例方法。