Concatenate First and Last Name into One String

Given two strings, firstName and lastName, return a single string in the format "last, first".

Examples

concatName("First", "Last") ➞ "Last, First"

concatName("John", "Doe") ➞ "Doe, John"

concatName("Mary", "Jane") ➞ "Jane, Mary"

Notes

• Don't forget to return the result.
• If you get stuck on a challenge, find help in the Resources tab.
• If you're really stuck, unlock solutions in the Solutions tab.