responds_to? determines whether a type has a method with the given name. For example:
a = 1 a.responds_to?(:abs) # => true a.responds_to?(:size) # => false
It is a pseudo-method because it only accepts a symbol literal as its argument, and is also treated specially by the compiler, as explained in if var.responds_to?(...).
To the extent possible under law, the persons who contributed to this workhave waived
all copyright and related or neighboring rights to this workby associating CC0 with it.