function differentSymbolsNaive(str) {
    //  write code here.
    const elementsArray = str.split("")
    const result = []
    
    for( el of elementsArray ){
        result.includes(el)
        ? null
        : result.push(el)
    }
    
    return (result.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);
    });
});