mutating-function

This question already has an answer here: Is Swift Pass By Value or Pass By Reference 8 answers I am not able to modify my model class variable even using mutating func keyword in a method? So basically I have wrapped my problem in a very easy way I have a class Car that has 3 variable id , start , and modelNo After that initialize an empty Car model array and then I want to show 10 cars, creating a range for loop which iterates 1...10 , initializing the Car model class and appending it to original cars array. There is a check for first 5 cars id will be 0 and last 5 cars id will be 1 I want a

I am trying to see if I can use structs for my model and was trying this. When I call vm.testClosure() , it does not change the value of x and I am not sure why. struct Model { var x = 10.0 } var m = Model() class ViewModel { let testClosure:() -> () init(inout model: Model) { testClosure = { () -> () in model.x = 30.5 } } } var vm = ViewModel(model:&m) m.x vm.testClosure() m.x An inout argument isn't a reference to a value type – it's simply a shadow copy of that value type, that is written back to the caller's value when the function returns. What's happening in your code is that your inout