class RuboCop::Cop::Performance::ChainArrayAllocation

array
array.map! { |x| x.downcase }
array.flatten!
array.compact!
array = [“a”, “b”, “c”]
# good.
@example
faster to mutate when we know it’s safe.
new intermediate array that is promptly thrown away. Instead it is
Each of these methods (‘compact`, `flatten`, `map`) will generate a
array.compact.flatten.map { |x| x.downcase }
array = [“a”, “b”, “c”]
# bad
@example
This cop is used to identify usages of

def on_send(node) 

def on_send(node)
  flat_map_candidate?(node) do |fm, sm, _|
    range = range_between(
      node.loc.dot.begin_pos,
      node.source_range.end_pos
    )
    add_offense(
      node,
      location: range,
      message: format(MSG, method: fm, second_method: sm)
    )
  end
end