By default parameters in swift operate are fixed. It means you can’t change parameters values from inside the operate in swift. Typically we have to get parameters worth to be modified from contained in the operate. So right here, inout parameters involves rescue as inout parameter in swift act like a reference kind. Take a look at beneath code block
func swapTwoNumbers(_ numA:Int, _ numbB:Int) {
let temporaryValue = numA
numA = numbB
numbB = temporaryValue
}
In above operate named swapTwoNumbers, we’re swapping the numbers handed as a parameters to the operate. In the event you run the above code, compiler will throw an error “Cannont assign to worth: ‘numA’ is a ‘let’fixed”. As a result of parameters handed in a swift operate are fixed by default.
Utilizing inout parameter
So right here, to take away the above error we will use inout key phrase and make these parameters as inout parameter in swift. Allow us to see how we will do it
func swapTowNumbers(_ numA: inout Int, _ numbB:inout Int) {
let temporaryValue = numA
numA = numbB
numbB = temporaryValue
}
Name a operate utilizing inout parameters
Perform utilizing inout parameters are referred to as like some other regular operate name. The one distinction is, we have to add ‘&’ earlier than the inout parameter title or worth. ‘&’ signifies that we this parameter is an inout parameter. Secondly, the values we’ll go as parameter must be a ‘Var’ i.e. variable worth not a ‘let’ i.e. a continuing worth.
var firstNumber = 10
var secondNumber = 30
swapTowNumbers(&firstNumber, &secondNumber)
print("Firstnumber == (firstNumber), and secondnumber == (secondNumber)")
In the event you run above code you possibly can see, that each the numbers, firstNumber and secondNumbers are swapped and result’s printed on xcode console.
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