function differentSymbolsNaive(str) {
    //  write code here.
    let countedCharacters = [];
    const characters = str.split("");
    characters.map((character) => {
        countedCharacters.includes(character)? false: countedCharacters.push(character);
    });
    return countedCharacters.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);
    });
    it('returns count of empty string', () => {
        // arrange
        const str = '';
        
        // act
        const result = differentSymbolsNaive(str);

        // log
        console.log("result: ", result);
        
        // assert
        expect(result).toBe(0);
    });
    it('returns count of non standard characters mixed with numbers', () => {
        // arrange
        const str = '"4£$"2<';
        
        // act
        const result = differentSymbolsNaive(str);

        // log
        console.log("result: ", result);
        
        // assert
        expect(result).toBe(6);
    });
});