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 */ }
);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 operationspromise javascript
let num = 10;
//call back function
const promis = new Promise(function (resolve, reject) {
if (num > 5) {
//this resolve method will send data to resoleveData variable
resolve(" Problem resolved successfully")
}
else {
//this reject method will send data to rejectData variable
reject("sorry problem couldn't solve")
}
})
//resoleveData variable
promis.then(function (resolveData) {
console.log(resolveData)
//rejectData variable
}).catch(function (rejectData) {
console.log(rejectData)
})Copyright © 2021 Codeinu
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