swift - passing integer Argument in a function -

func getdriverfromid(var id : int?) -> string {      if id == nil {         return "no driver assigned"     }     else {         loaddriversrest()     }      return "test"  }  getdriverfromid(nil) 

i getting error "getdriverfromid argument list of type (nil)"

your code correct , works fine. said have couple of suggestions , have included (working) playground you.

given code first checks whether id nil, don't need else flow stop (or return) anyway - makes little more pleasing eye...

with in mind, function this:

func getdriverfromid(var id : int?) -> string {      if id == nil {         return "no driver assigned"     }      loaddriversrest()      return "test"  } 

also, unless plan on changing "id" within code of function, don't need var before it. basically, function arguments non-mutable default can't change them, adding var enables change value of argument within code.

with of in mind, here playground showing working. hope helped...

import uikit  func loaddriversrest() {     // doesn't     return }  func getdriverfromid(id : int?) -> string {      if id == nil {         return "no driver assigned"     }       loaddriversrest()      return "test"  }  println(getdriverfromid(nil))   // works println(getdriverfromid(15))    // works