closureArray.swift

let plus: (Int, Int) -> Int = {
  return $0 + $1
}

let minus: (Int, Int) -> Int = {
  return $0 - $1
}

let add: (Int, Int) -> Int = {
  return $0 + $1
}

let subtract: (Int, Int) -> Int = {
  return $0 - $1
}

let closureFunctions = [ plus, minus ]

let plusSign = closureFunctions[0]
print(plusSign(1, 5))
//result is:
//6

//The append method
closureFunctions.append(add)
closureFunctions.append(subtract)

print(closureFunctions.count)
//result is:
//4

for closure in closureFunctions {
   print(closure(6,5))
}
//result is:
//11
//1
//11
//1

let addition: (Int, Int) -> Int = {
  return $0 + $1
}

let subtraction: (Int, Int) -> Int = {
  return $0 - $1
}

let closureFunctions2= [ addition, subtraction ]

let newClosureFunction = closureFunctions + closureFunctions2
print(newClosureFunction.count)
//result is:
//6