find_unique_characters_in_a_string.md

Find Unique Characters in a String

Find Unique Characters in a String

To find unique characters in a string, you can use a set to keep track of characters you've seen.

Algorithm:

1. Initialize an empty set.
2. Iterate through the string and add each character to the set.
3. Return the characters in the set as a string.

Example:

function findUniqueChars(str) {
    const uniqueChars = new Set(str);
    return [...uniqueChars].join('');
}

// Example usage
console.log(findUniqueChars('aabbcc')); // Output: 'abc'
console.log(findUniqueChars('hello')); // Output: 'helo'

This method has a time complexity of O(n), where n is the length of the string.

Tags: basic, JavaScript, Strings, Algorithm