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Roland O'Donnell
Roland O'Donnell
5,667 Points

changing func input parameters to a var? I get a warning saying var parameters are deprecated & will b removed in swift3


func countDownAndup(var a: Int) {
    var b = a

    while b >= 0 {
        b -= 1
        a += 1
        print ("a: \(a)")
        print ("b: \(b)")

1 Answer

Cindy Lea
Cindy Lea
Courses Plus Student 6,497 Points

Yes, they are talking about this online & advise using shadowing. According to stackoverflow.com : http://stackoverflow.com/questions/36414183/swift-3-var-deprecated-error/36414199

In swift 3.0 variable parameters to functions will be removed. This is due to the designers of the language believe it can be ambiguous with inout variables. You can use shadowing to easily fix this like so:

func filterContentForSearchText(searchText: String, scope: NSInteger) {
    var searchText = searchText       
    searchText = searchText.lowercaseString;

Here we assign a local variable searchText to be the value of the constant searchText parameter. Due to shadowing the local variable is what is referenced when searchText is used.