const allLongestStrings = array =>
    array.filter((v, i, a) =>
        v.length === a.map(w => w.length).reduce((acc, cur) => cur > acc ? cur : acc, -1)
    );

/**
* Test Suite 
*/
describe('allLongestStrings()', () => {
    it('returns all longest strings', () => {
        // arrange
        const strings = ["aba", "aa", "ad", "vcd", "aba", "a"];
        
        // act
        const result = allLongestStrings(strings);

        // log
        console.log("result: ", result);
        
        // assert
        expect(result).toEqual(["aba", "vcd", "aba"]);
    });
});