ASYNC JS: ES6 Promise.all method - unexpected output dilemma.

My question is about why there are two expected outputs from sololearn challenges in this chunk of ajax code but when I test in the debugger this gives me only [foo, car] as output? const a = new Promise((res, rej) => { //n1     setTimeout(() => res('foo'), 300); }); const b = new Promise((res, rej) =>  {     setInterval(() => rej('bar'), 100);     res('car'); }); Promise.all([a, b]).then((race) => {     console.log(race); }).catch((crash) => {     console.log(crash); }); Right answers: [foo, car] ['bar', 'car'] - why this?