“Obietnica” Kod odpowiedzi

Obietnica powrotu JavaScript

function doSomething() {
  return new Promise((resolve, reject) => {
    console.log("It is done.");
    // Succeed half of the time.
    if (Math.random() > .5) {
      resolve("SUCCESS")
    } else {
      reject("FAILURE")
    }
  })
}

const promise = doSomething(); 
promise.then(successCallback, failureCallback);
Elyesc4

Obiecaj Catch

//create a Promise
var p1 = new Promise(function(resolve, reject) {
  resolve("Success");
});

//Execute the body of the promise which call resolve
//So it execute then, inside then there's a throw
//that get capture by catch
p1.then(function(value) {
  console.log(value); // "Success!"
  throw "oh, no!";
}).catch(function(e) {
  console.log(e); // "oh, no!"
});
POG

Obietnice JavaScript

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 */ }
);
Grepper

Obiecuje ex.

console.log('some piece of code');
examplePromise.then(function(result){
  console.log(result);
}).catch(function (error) {
  console.error(error);
});
console.log('another piece of code');
Blue Beetle

obietnica

conts trypromises= new Promise((resolve,reject)=>{
	reject()	
  resolve()
});

trypromises.then((data)=>{
	console.log(data)
}).then()

----------------------------------
const proses=(aa)=>{
	return new Promise((resolve,reject)=>{
      	reject()
    	resolve()
    })
};
Bored Bird

Obietnica

let doSecond = () => {
  console.log('Do second.')
}

let doFirst = new Promise((resolve, reject) => {
  setTimeout(() => {
    console.log('Do first.')

    resolve()
  }, 500)
})

doFirst.then(doSecond)
Mystic Dev

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