how to add commas to a number in swift?

Question

How would I add commas to a number that I'm retrieving from a JSON in swift.

Example 31908551587 to 31,908,551,587 

I'm so confused and I have no idea what to do.

Answer 1

You can do it with NSNumberFormatter

Swift 4

let largeNumber = 31908551587 let numberFormatter = NumberFormatter() numberFormatter.numberStyle = .decimal let formattedNumber = numberFormatter.string(from: NSNumber(value:largeNumber)) 

Swift 3

 let largeNumber = 31908551587  let numberFormatter = NumberFormatter()  numberFormatter.numberStyle = NumberFormatter.Style.decimal  let formattedNumber = numberFormatter.string(from: NSNumber(value:largeNumber)) 

Swift 2

 let largeNumber = 31908551587  let numberFormatter = NSNumberFormatter()  numberFormatter.numberStyle = NSNumberFormatterStyle.DecimalStyle  let formattedNumber = numberFormatter.stringFromNumber(largeNumber) 

Answer 2

Expanding on Özgür Ersil's answer, you can isolate the functionality with an extesion to Int:

extension Int {     func withCommas() -> String {         let numberFormatter = NumberFormatter()         numberFormatter.numberStyle = .decimal         return numberFormatter.string(from: NSNumber(value:self))!     } } 

To then use on your code as:

largeNumber.withCommas()