rb/proc

blocks and lambda expressions

(proc)

Matching:

1. brace blocks, e.g. { |x| x }
2. do/end blocks, e.g. do |x| x end
3. lambda expressions, e.g. ->(x) { x }

Behavior

• Matches blocks and lambdas; does not match Proc.new calls.

Examples

Audit all blocks and lambdas before refactoring iteration patterns.

(proc)

Selects in lines { 1, 0, 5 } but not in { }:

items.each { |x| x + 1 }
items.map do |x|
  x * 2
end
transform = ->(x) { x + 1 }

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Find lambdas used as callbacks.

(:and (proc) (:text /->/))

Selects in lines { 1 } but not in { 2 }:

handler = ->(x) { x + 1 }
items.each { |x| x + 1 }

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