closureDict.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": plus, "minus" : minus ]

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


//Add a new value to the dictionary
closureFunctions["add"] = add
closureFunctions["subtract"] = subtract

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


for (key, value) in closureFunctions {
  print("(\(key),\(value(5, 6)))")
}
//result is:
//(plus, 11)
//(minus, 1)
//(add, 11)
//(subtract, 1)