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A minimalist string algorithm developer challenge: write a function in any language that returns the first non-repeating character in a string, or null if every character repeats. Our example Python version solves it in 87 characters. Your turn: Can you make it shorter? Which language gives you the cleanest frequency counting? Can you make it O(n)? Share your solution in the comments!
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Speaker: Christine Rafla
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2026/03/16
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