class RuboCop::Cop::Naming::MethodName

def fooBar; end
# good
def foo_bar; end
# bad
@example EnforcedStyle: camelCase
def foo_bar; end
# good
def fooBar; end
# bad
@example EnforcedStyle: snake_case (default)
Method names matching patterns are always allowed.
- ‘As*onSelectionCleareds*’
- ‘As*onSelectionBulkChanges*’
IgnoredPatterns:
Naming/MethodName:
This cop has ‘IgnoredPatterns` configuration option.
snake_case or camelCase, for their names.
This cop makes sure that all methods use the configured style,

def attr_name(name_item) 

def attr_name(name_item)
  sym_name(name_item) || str_name(name_item)
end

def message(style) 

def message(style)
  format(MSG, style: style)
end

def on_def(node) 

def on_def(node)
  return if node.operator_method? ||
            matches_ignored_pattern?(node.method_name)
  check_name(node, node.method_name, node.loc.name)
end

def on_send(node) 

def on_send(node)
  return unless (attrs = node.attribute_accessor?)
  attrs.last.each do |name_item|
    name = attr_name(name_item)
    next if !name || matches_ignored_pattern?(name)
    check_name(node, name, range_position(node))
  end
end

def range_position(node) 

def range_position(node)
  selector_end_pos = node.loc.selector.end_pos + 1
  expr_end_pos = node.loc.expression.end_pos
  range_between(selector_end_pos, expr_end_pos)
end