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 */ }
);const anotherPromise = new Promise((resolve, reject) => {
setTimeout(() => {
resolve('this is the eventual value the promise will return');
}, 300);
});
// CONTINUATION
anotherPromise
.then(value => { console.log(value) })let promise = new Promise((resolve,reject)=>{
try {
resolve("some data");
} catch (error) {
reject(error);
}
})
promise.then(function (data) {
console.log(data);
},function (error) {
console.error(error);
})
// make new promise ... so this object will promise us that it will hold an Asynchronous action
// some times promise resolve and some times promise get rejected
const A = new Promise((resolve, reject) => {
setTimeout(() => {
// here we pass argument if promise get resolved
resolve('Done');
// here we pass argument if promise get rejected
reject('Didn"t');
}, 3000);
});
// design handling callback function for resolve
let handleResolvedA = (massage)=>{console.log(massage)}
// design handling callback function for reject
let handleRejectedA = (massage)=>{console.log(massage)}
// do handling for both
A.then(handleResolvedA, handleRejectedA)var posts = [
{name:"Mark42",message:"Nice to meet you"},
{name:"Veronica",message:"I'm everywhere"}
];
function Create_Post(){
setTimeout(() => {
posts.forEach((item) => {
console.log(`${item.name} --- ${item.message}`);
});
},1000);
}
function New_Post(add_new_data){
return new Promise((resolve, reject) => {
setTimeout(() => {
posts.push(add_new_data);
var error = false;
if(error){
reject("Something wrong in </>, Try setting me TRUE and check in console");
}
else{
resolve();
}
},2000);
})
}
New_Post({name:"War Machine",message:"I'm here to protect"})
.then(Create_Post)
.catch(err => console.log(err));function examplePromise(){
let promiseToReturn = new Promise(function (resolve, reject) {
let sum;
setTimeout(function(){
sum = 5 + 6;
if(sum > 10) {
resolve(sum);
}else{
reject('The promise has been rejected');
}
}, 2000);
});
return promiseToReturn;
}
console.log('some piece of code');
examplePromise().then(function(result){
console.log(result);
}).catch(function(error){
console.log(error);
});
console.log('another piece of code');