def method name(argument)
  #formula
end

def method name(argument) = #formula

Receiver.Method name(argument)

Proc.new{|argument|formula}
proc{|argument|formula}
Object of Symbol or Hash or Method class.to_proc[argument]

lambda{|argument|formula}
-> (argument){formula}

Receiver[argument]
Receiver.(argument)
Receiver.call(argument)
Receiver.yield(argument)
Receiver=== #argument

Receiver.method(Method name Symbol or String)

Receiver[variable]
Receiver.(variable){formula}
Receiver.call(variable){formula}
Receiver===variable

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