Daily JavaScript Challenge #JS-133: Count Unique Characters in a String

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Daily JavaScript Challenge: Count Unique Characters in a String

Hey fellow developers! 👋 Welcome to today's JavaScript coding challenge. Let's keep those programming skills sharp!

The Challenge

Difficulty: Easy

Topic: Strings

Description

Create a function that counts the number of unique characters in a given string. The function should be case-sensitive, meaning that 'a' and 'A' are considered different characters.

Ready to Begin?

https://www.dpcdev.com/

Fork this challenge
Write your solution
Test it against the provided test cases
Share your approach in the comments below!

Want to Learn More?

Check out the documentation about this topic here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set

Join the Discussion!

How did you approach this problem?
Did you find any interesting edge cases?
What was your biggest learning from this challenge?

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This is part of our Daily JavaScript Challenge series. Follow me for daily programming challenges and let's grow together! 🚀

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Top comments (1)

James Curran • Mar 25

In C#: (Since C# lets you treat a string like an array of characters, this becomes trivial)

    void Main()
    {
        string text = "the quick brown fox jumps over the lazy dog";

        CountCharacters(text).Dump();
    }

    int CountCharacters(string text) 
                              => text.Distinct().Count();