A function operation expression is a special syntax for an invocation expression in which the first argument is given before the arrow (->) symbol, which is followed by the name of the function to be invoked and an argument list for any remaining arg...s

A function operation expression is a special syntax for an invocation expression in which the first argument is given before the arrow (->) symbol, which is followed by the name of the function to be invoked and an argument list for any remaining arguments ... This is useful for chaining invocations in an effective data flow.