Promise Race Example 3

promiseRace3

Promise.seriousRace = function(promises) {
  let indexPromises = promises.map((p, index) => p.catch(() => {throw index}))
  return Promise.race(indexPromises).catch(index => {
    let p = promises.splice(index, 1)[0]
    p.catch(e => console.log( e +  ' terjatuh,ahh sudahlah lanjutkan saja'))
    return Promise.seriousRace(promises)
  })
}

let peserta1 = new Promise(resolve => setTimeout(resolve, 30, 'Peserta 1'))
let peserta2 = new Promise((resolve,reject) => setTimeout(reject, 20, 'Peserta 2'))
let peserta3 = new Promise(resolve => setTimeout(resolve, 50, 'Peserta 3'))
let peserta4 = new Promise(resolve => setTimeout(resolve, 100, 'Peserta 4'))
let peserta5 = new Promise(resolve => setTimeout(resolve, 90, 'Peserta 5'))
 
Promise.seriousRace([peserta1, peserta2, peserta3, peserta4, peserta5])
  .then(val => console.log('Balapan selesai,Pemenangnya adalah:', val))
  .catch(err => console.log('Balapan dihentikan karena : ', err))