CodeSign - Different Symbols Naive

differentSymbolsNaive.js

/*
Given a string, find the number of different characters in it.

Example

For s = "cabca", the output should be
differentSymbolsNaive(s) = 3.

There are 3 different characters a, b and c.
*/

function differentSymbolsNaive(s) {
    // Turn string into array of strings
    let arr = s.split('');

    // Get unique letters by turning the array into a set
    let uniqueLetters = new Set(arr);

    // Turn the set with unique letters back into an array so we can access the .length attribute of the array
    let uniqueLettersArr = [...uniqueLetters];
   
    // Return the length
    return uniqueLettersArr.length;
}