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 */ }
);Creating a promise
JS
copy
let done = true
const isItDoneYet = new Promise((resolve, reject) => {
if (done) {
const workDone = 'Here is the thing I built'
resolve(workDone)
} else {
const why = 'Still working on something else'
reject(why)
}
})what is promise in javascript
Promises make async javascript easier as they are easy to use and write than callbacks. Basically , promise is just an object , that gives us either success of async opertion or failue of async operationspromises in javascript
myPromise.then(
function(value) { /* code if successful */ },
function(error) { /* code if some error */ }
);Copyright © 2021 Codeinu
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