javascript promises
var promise = new Promise(function(resolve, reject) {
// do some long running async thing…
if (/* everything turned out fine */) {
resolve("Stuff worked!");
}
else {
reject(Error("It broke"));
}
});
//usage
promise.then(
function(result) { /* handle a successful result */ },
function(error) { /* handle an error */ }
);new promise function
const myPromise = new Promise((resolve, reject) => {
setTimeout(() => {
resolve('foo');
}, 300);
});
myPromise
.then(handleResolvedA, handleRejectedA)
.then(handleResolvedB, handleRejectedB)
.then(handleResolvedC, handleRejectedC);promise syntax for javascript
let myPromise = new Promise(function(myResolve, myReject) {
// "Producing Code" (May take some time)
myResolve(); // when successful
myReject(); // when error
});
// "Consuming Code" (Must wait for a fulfilled Promise)
myPromise.then(
function(value) { /* code if successful */ },
function(error) { /* code if some error */ }
);promise javascript
let promise = new Promise(function(resolve, reject){
try{
resolve("works"); //if works
} catch(err){
reject(err); //doesn't work
}
}).then(alert, console.log); // if doesn't work, then console.log it, if it does, then alert "works"js promise
const executorFunction = (resolve, reject) => {
if (someCondition) {
resolve('I resolved!');
} else {
reject('I rejected!');
}
}
const myFirstPromise = new Promise(executorFunction);promise js
A Promise is in one of these states:
pending: initial state, neither fulfilled nor rejected.
fulfilled: meaning that the operation was completed successfully.
rejected: meaning that the operation failed.Copyright © 2021 Codeinu
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