promise all in promise all
var arr = [
{subarr: [1,2,3]},
{subarr: [4,5,6]},
{subarr: [7,8,9]}
];
function processAsync(n) {
return new Promise(function(resolve) {
setTimeout(
function() { resolve(n * n); },
Math.random() * 1e3
);
});
}
Promise.all(arr.map(function(entity){
return Promise.all(entity.subarr.map(function(item){
return processAsync(item);
}));
})).then(function(data) {
console.log(data);
});promise.all
// A simple promise that resolves after a given time
const timeOut = (t) => {
return new Promise((resolve, reject) => {
setTimeout(() => {
if (t === 2000) {
reject(`Rejected in ${t}`)
} else {
resolve(`Completed in ${t}`)
}
}, t)
})
}
const durations = [1000, 2000, 3000]
const promises = []
durations.map((duration) => {
promises.push(timeOut(duration))
})
// We are passing an array of pending promises to Promise.all
Promise.all(promises)
.then(response => console.log(response)) // Promise.all cannot be resolved, as one of the promises passed got rejected.
.catch(error => console.log(`Error in executing ${error}`)) // Promise.all throws an error.Copyright © 2021 Codeinu
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