Sort-by-String-Length.js

/*
Create a function that returns an array of strings sorted by length in ascending order. Strings should have unique lengths (don't worry about comparing two strings with identical length).
Return an empty array if the input array is empty. 

sortByLength(["a", "ccc", "dddd", "bb"]) ➞ ["a", "bb", "ccc", "dddd"]
sortByLength(["apple", "pie", "shortcake"]) ➞ ["pie", "apple", "shortcake"]
sortByLength(["may", "april", "september", "august"]) ➞ ["may", "april", "august", "september"]
sortByLength([]) ➞ []

*/