non-repeating-chars.md

Non-repeating character in a string

Write a function that takes a string and returns the first character in it that does not repeat two or more times.

Example:

nonRepeating("abcba") // should return "c"
nonRepeating("ddgTwWgpp") // should return "w"

Problem Set

"abcab" // should return "c"
"abab" // should return ""
"aabbbc" // should return "c"
"aabbdbc" // should return "d"