class RuboCop::Cop::Performance::Size
This cop is used to identify usages of `count` on an `Array` and `Hash` and change them to `size`.
@example
# bad [1, 2, 3].count # bad {a: 1, b: 2, c: 3}.count # good [1, 2, 3].size # good {a: 1, b: 2, c: 3}.size # good [1, 2, 3].count { |e| e > 2 }
TODO: Add advanced detection of variables that could have been assigned to an array or a hash.
Constants
- MSG
Public Instance Methods
autocorrect(node)
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# File lib/rubocop/cop/performance/size.rb, line 41 def autocorrect(node) ->(corrector) { corrector.replace(node.loc.selector, 'size') } end
on_send(node)
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# File lib/rubocop/cop/performance/size.rb, line 29 def on_send(node) receiver, method, args = *node return if receiver.nil? return unless method == :count return unless array?(receiver) || hash?(receiver) return if node.parent && node.parent.block_type? return if args add_offense(node, node.loc.selector) end
Private Instance Methods
array?(node)
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# File lib/rubocop/cop/performance/size.rb, line 47 def array?(node) receiver, method = *node _, constant = *receiver node.array_type? || constant == :Array || method == :to_a end
hash?(node)
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# File lib/rubocop/cop/performance/size.rb, line 54 def hash?(node) receiver, method = *node _, constant = *receiver node.hash_type? || constant == :Hash || method == :to_h end