How to do it...

1. Open your command-line application and navigate to your workspace.
2.  Create a new folder named 3-02-resolving-promise-results.
3. Copy or create an index.html that loads and runs a main function from main.js.

4. Create a main.js file that creates a promise and logs messages before and after the promise is created:

// main.js 
export function main () { 
 
  console.log('Before promise created'); 
 
  new Promise(function (resolve) { 
  }); 
 
  console.log('After promise created'); 
} 

5. Within the promise, resolve a random number after a 5-second timeout:

    new Promise(function (resolve) { 
      setTimeout(function () {
        resolve(Math.random());
      }, 5000); 
    }) 

6. Chain a then call off the promise. Pass a function that logs out the value of its only argument:

   new Promise(function (resolve) { 
      setTimeout(function () { 
        resolve(Math.random()); 
      }, 5000); 
    }).then(function (result) {
      console.log('Long running job returned: %s', result);
    });

7. Start your Python web server and open the following link in your browser: 
   http://localhost:8000/.

8. You should see the following output: