Why am I getting this error when the arguments for the function are the same as what's being passed?
class ViewController: NSViewController { func foo(path: String, arguments: [String], showOutput: Bool) -> Void { } @IBAction func a1(_ sender: NSButton) { let path = "/sbin/ping" let arguments = ["-c", "5", "google.com"] self.foo(path, arguments, true){ // I'm getting extra argument in call for true } } 
func foo(_ path: String,_ arguments: [String],_ showOutput: Bool) -> Void { /// Prerform task here whic you want to perform while calling this /// function or task with those Paramaters } @IBAction func a1(_ sender: NSButton) { let path = "/sbin/ping" let arguments = ["-c", "5", "google.com"] /// It is just a normal Function that accepts parameteres and /// Preform requred Task self.foo(path, arguments, true) } 
_'s
_ are not actually needed. They are optional.The line (with the mysterious extra { at the end):
self.foo(path, arguments, true){ needs to be:
self.foo(path: path, arguments: arguments, showOutput: true) The use of self. is optional.