Proc.new

Proc.new

A Proc wraps a block of code as a reusable, storable object that can be assigned to a variable and called later with .call. Proc.new { ... } (or the shorthand proc { ... }) creates one explicitly, unlike a plain block which only exists inline at a single call site. Procs are lenient about argument count -- passing too many or too few doesn't raise an error.

Note: A Proc silently ignores extra arguments and fills missing ones with nil, unlike a Lambda which enforces arity strictly.

Example: Proc.new

square = Proc.new { |x| x * x }

puts square.call(5)
puts square.(6)
puts square[7]