function differentSymbolsNaive(str) {
    //  write code here.
    const letters = str.split("")
    const n = letters.length
    let array = []
    
     for(let i=0; i < n; i++) {
        if(array.includes(letters[i]) === false) array.push(letters[i])  
    }
    return array.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);
    });
});