function differentSymbolsNaive(str) {
    let splitStr = str.split("")
    let unique = splitStr.length //5

    for(i=0; i < splitStr.length; i++) {
        console.log("unique:" + " " + unique)
        console.log(splitStr[i])
        console.log("slice:" + " " + splitStr.slice(i+1))
        
        if (splitStr.slice(i+1).includes(splitStr[i])) {
            console.log(splitStr.slice(i+1) + " includes " + splitStr[i])
            unique = unique - 1
        }
    }
    return unique
}

/* or: 

function differentSymbolsNaive(str) {
    let splitStr = str.split("")
    let diffChar = {} 

    for(i=0; i < splitStr.length; i++) {
        if (diffChar[splitStr[i]] === undefined) {
            diffChar[splitStr[i]] = 0
        }
        diffChar[splitStr[i]]++
    }
    console.log(diffChar)
    return Object.keys(diffChar).length
    */


       
/**
* Test Suite 
*/
describe('differentSymbolsNaive()', () => {
    it('returns count of unique characters', () => {
        // arrange
        const str = 'cabca';
        
        // act
        const result = differentSymbolsNaive(str);

        // log
        console.log("result: ", result);
        
        // assert
        expect(result).toBe(3);
    });
});