function differentSymbolsNaive(str) {
    var count = 0;
    var arr = str.split('');
    var symbols = [];
    for (var i = 0; i < arr.length; i++) {
        if(!symbols.includes(arr[i])) {
            symbols.push(arr[i]);
            count++;
        }
    }
    return count;
}



/**
* 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);
    });
});