Proc Lambda

Proc and lambda objects store callable behavior in variables.

proc_lambda.rb

base = 

doubler = Proc.new do |value|
  value * 2
end

labeler = lambda do |value|
  "value=#{value}"
end

result = doubler.call(base)
label = labeler.call(result)

puts "base=#{base}"
puts label

base = 

doubler = Proc.new do |value|
  value * 2
end

labeler = lambda do |value|
  "value=#{value}"
end

result = doubler.call(base)
label = labeler.call(result)

puts "base=#{base}"
puts label

base = 

doubler = Proc.new do |value|
  value * 2
end

labeler = lambda do |value|
  "value=#{value}"
end

result = doubler.call(base)
label = labeler.call(result)

puts "base=#{base}"
puts label

callable object A callable object can be assigned to a variable and later invoked with `call`.