function differentSymbolsNaive(str) {
    //  write code here.
    let chars = [];
    for(let i = 0; i < str.length; i++) {
        if(chars.indexOf(str[i]) === -1) {
            chars.push(str[i]);
        }
    }
    return chars.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);
    });
});