How do I properly format a phone number?

I have a phone number that looks like this:

(def phone_number "1112224444")

When I try this:

(string/format (string/slice phone_number 0 3)
               (string/slice phone_number 3 6) 
               (string/slice phone_number 6 10))

I only get 111

I want to get 111-222-4444

>Solution :

You need to use string/format with %s:

(string/format "%s-%s-%s" (string/slice phone_number 0 3) 
                          (string/slice phone_number 3 6)
                          # You can also use 6 -1 (this works no matter the length 
                          # of the string).
                          (string/slice phone_number 6 10)) 

# Output: 111-222-4444