Kitu na Kosa la Ahadi katika JavaScript
Inakubalika zaika kwenye funkta reject kupitisha
si mkondo wenye kosa, bali kitu chenye kosa:
let promise = new Promise(function(resolve, reject) {
setTimeout(function() {
reject(new Error('kosa katika ahadi')); // kitu chenye kosa
}, 3000);
});
Pia unaweza kutupa vitu vilivyo na makosa
kwa kutumia throw - hii itakuwa sawa na
kupitisha kwenye reject:
let promise = new Promise(function(resolve, reject) {
setTimeout(function() {
throw new Error('kosa katika ahadi'); // sawa na reject
}, 3000);
});
Badilisha mfumo ufuatao kulingana na yale yaliyojifunzwa:
let promise = new Promise(function(resolve, reject) {
setTimeout(function() {
let isError = false;
if (!isError) {
resolve('mafanikio');
} else {
reject('kosa');
}
}, 3000);
});
