# Swift 3 Challenge 4: Being Cool

Today’s code challenge is about being cool.

Problem Description:

A number is cool if it’s a multiple of 11 or if it is one more than a multiple of 11.
Return true if the given non-negative number is cool.

Test Cases:

Try this before you look at my solution.

Seriously – try it yourself.

Last chance.

Okay – here is my solution.

Here is the Ternary Operator again with a modulus operator used twice making it another one-liner.

Either condition would make the number a multiple of 11 or one more than a multiple of 11.

You can view my solution at the IBM Swift Sandbox.

## 2 thoughts on “Swift 3 Challenge 4: Being Cool”

1. bennokress says:

Why do you use the ternary operator here? Everything before the question mark is already giving you the Bool you need 😉

By the way, if you would hypothetically need this often in your App, I’d even suggest the following which is more readable in the end:

extension Int {
var isCool: Bool {
return (self % 11 == 0) || (self % 11 == 1)
}
}

Usage:
22.isCool // true
23.isCool // true
24.isCool // true