nodejs promise then code example

Example 1: promise 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!"
});

Example 2: nodejs promise then example

p.then(onFulfilled, onRejected);

p.then(function(value) {
   //  run
  }, function(reason) {
  // fail
});

Example 3: .then javascript

const promise2 = doSomething().then(successCallback, failureCallback);