How to compare two strings ignoring case in Swift language?

Question

How can we compare two strings in swift ignoring case ? for eg :

var a = \"Cash\"
var b = \"cash\"

Is there any method that will return tru

Answer 1

extension String
{
    func equalIgnoreCase(_ compare:String) -> Bool
    {
        return self.uppercased() == compare.uppercased()
    }
}

sample of use

print("lala".equalIgnoreCase("LALA"))
print("l4la".equalIgnoreCase("LALA"))
print("laLa".equalIgnoreCase("LALA"))
print("LALa".equalIgnoreCase("LALA"))

Answer 2

Phone numbers comparison example; using swift 4.2

var selectPhone = [String]()

if selectPhone.index(where: {$0.caseInsensitiveCompare(contactsList[indexPath.row].phone!) == .orderedSame}) != nil {
    print("Same value")
} else {
    print("Not the same")
}

Answer 3

CORRECT WAY:

let a: String = "Cash"
let b: String = "cash"

if a.caseInsensitiveCompare(b) == .orderedSame {
    //Strings match 
}

Please note: ComparisonResult.orderedSame can also be written as .orderedSame in shorthand.

OTHER WAYS:

a.

if a.lowercased() == b.lowercased() {
    //Strings match 
}

b.

if a.uppercased() == b.uppercased() {
    //Strings match 
}

c.

if a.capitalized() == b.capitalized() {
    //Strings match 
}

Answer 4

You could also make all the letters uppercase (or lowercase) and see if they are the same.

var a = “Cash”
var b = “CASh”

if a.uppercaseString == b.uppercaseString{
  //DO SOMETHING
}

This will make both variables as ”CASH” and thus they are equal.

You could also make a String extension

extension String{
  func equalsIgnoreCase(string:String) -> Bool{
    return self.uppercaseString == string.uppercaseString
  }
}

if "Something ELSE".equalsIgnoreCase("something Else"){
  print("TRUE")
}

Answer 5

Try this :

For older swift:

var a : String = "Cash"
var b : String = "cash"

if(a.caseInsensitiveCompare(b) == NSComparisonResult.OrderedSame){
    println("voila")
}

---

Swift 3+

var a : String = "Cash"
var b : String = "cash"

if(a.caseInsensitiveCompare(b) == .orderedSame){
    print("voila")
}

Answer 6

Swift 3:

You can also use the localized case insensitive comparison between two strings function and it returns Bool

var a = "cash"
var b = "Cash"

if a.localizedCaseInsensitiveContains(b) {
    print("Identical")           
} else {
    print("Non Identical")
}