Chaining Multiple Promises - 03

Chaining multiple promises:

We can work with multiple promises. We can do this by using the .then() function.

var firstMethod = function () {
      var promise = new Promise(function (resolve, reject) {
        setTimeout(function () {
          console.log("first method completed");
          resolve({ data: "123" });
        }, 2000);
      });
      return promise;
    };

    var secondMethod = function (someStuff) {
      var promise = new Promise(function (resolve, reject) {
        setTimeout(function () {
          console.log("second method completed");
          resolve({ newData: someStuff.data + " some more data" });
        }, 2000);
      });
      return promise;
    };

    var thirdMethod = function (someStuff) {
      var promise = new Promise(function (resolve, reject) {
        setTimeout(function () {
          console.log("third method completed");
          resolve({ result: someStuff.newData });
        }, 3000);
      });
      return promise;
    };

    firstMethod().then(secondMethod).then(thirdMethod);