Question

I have an R code which looks like:

func1 = function(a) {

  func2 = function(a) {
    return(a+2)
  }

  func3 = function(a) {
    return(a+3)
  }
  return(a+func2(a))
}

Is it possible that I be able to call func2 or func3 from outside func1?
eg. How do I run:

x <- func2(10) #from the console?

Answer 1

You could create a function closure:

##I've removed the brackets and return to shorten the function
func1 = function(a) {
  func2 = function(a) a+2
  func3 = function(a) a+3
  return(list(func2=func2, func3=func3))
}

You can use the closure to share variables:

func1 = function(a) {
    a = a
    func2 = function() a + 2
    func3 = function() a + 3 
    return(list(func2=func2, func3=func3))
}

f = func1(50)
f$func2()
f$func3()