new Promise(function(resolve, reject) {});

pending: initial state, neither fulfilled nor rejected.
fulfilled: meaning that the operation completed successfully.
rejected: meaning that the operation failed.

const myFirstPromise = new Promise((resolve, reject) => {
  // do something asynchronous which eventually calls either:
  //
  //   resolve(someValue); // fulfilled
  // or
  //   reject("failure reason"); // rejected
});

let myFirstPromise = new Promise((resolve, reject) => {
  setTimeout(function(){
    resolve("Success!");
  }, 250);
});

myFirstPromise.then((successMessage) => {
  console.log("Yay! " + successMessage);
});

// var b = true;
var b = false;

var p1 = new Promise(function (resolve, reject) {
  if (b) {
    resolve('Success!');
  } else {
    reject(Error('oh, no!'));
  }
});

var myFunc = function() {
  p1.then(function(value){
    console.log(value);
  })
  .catch(function(e) {
    console.log(e);
  })
};

myFunc();

var doSomething = function(value) {
  return new Promise(function (resolve, reject) {
    resolve('Success!');
  });
};

var doSomething = function(value) {
  return Promise.resolve('Success!');
};

Promise

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