function differentSymbolsNaive(str) {
    let string = str
    if (typeof str === 'number') string = str.toString()
    const unique = new Set([...string]);
    return unique.size
}



/**
* 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 unique numbers', () => {
        // arrange
        const str = 1233;
        
        // act
        const result = differentSymbolsNaive(str);

        // log
        console.log("result: ", result);
        
        // assert
        expect(result).toBe(3);
    });
});