def add(a, b) {
  println "Added!"
  return a + b
}

def sum = { a, b ->
  println "summed"
  return a * b
}

def runAFunction(inputA, functionToRun) {
  println "inside run a function"
  return inputA + functionToRun
}

​runAFunction(1, sum(2,3)​)​