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Ruby::Prism::Node#type
# File tmp/rubies/ruby-4.1.0-preview1/lib/ruby/prism/node.rb, line 423
def type
raise NoMethodError, "undefined method `type' for #{inspect}"
end
Sometimes you want to check an instance of a node against a list of classes to see what kind of behavior to perform. Usually this is done by calling [cls1, cls2].include?(node.class) or putting the node into a case statement and doing case node; when cls1; when cls2; end. Both of these approaches are relatively slow because of the constant lookups, method calls, and/or array allocations.
Instead, you can call type, which will return to you a symbol that you can use for comparison. This is faster than the other approaches because it uses a single integer comparison, but also because if you’re on CRuby you can take advantage of the fact that case statements with all symbol keys will use a jump table.
: () -> Symbol