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Thursday Code Puzzler: Find the First Character That Appears Once

Thursday is code puzzler day here at DZone. The idea is simple: solve the coding problem as efficiently as you can, in any language or framework that you find suitable.

Note: Even though there really is nothing stopping you from finding a solution to this on the internet, try to keep honest, and come up with your own answer.  It's all about the participation!

Do you have code puzzlers that you'd like to share with the DZone community?  If so, please submit here. 

Find the First Character That Appears Once

Write a  method that takes a string, and returns the first character with only one occurrence in the string. For example, if the input was "this is DZone's Thursday Code Puzzler" it would return n. Have fun, and keep it efficient!

Catch up on all our previous puzzlers here.


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{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ }}
{{ parent.authors[0].realName ||}}

{{ parent.authors[0].tagline || parent.tagline }}

{{ parent.views }} ViewsClicks