Asynchronous Promise-based exec demo

exec.ts

import {Promise as Promise} from 'es6-promise';

module exec {

  function doExec(shouldSucceed: boolean) : Promise<number> {
    return new Promise((resolve, reject) => {
      doSubExec(shouldSucceed)
      .then((result) => {
        resolve(result);
      },(error) => {
        reject(error);
      });
    });
  }

  function doSubExec(shouldItSucceed: boolean) : Promise<number> {
    return new Promise((resolve, reject) => {
      if (shouldItSucceed) {
        resolve(42);
      } else {
        reject(-1);
      }
    });
  }

  function printNumericResult(theNumber: number) {
    console.log("Result was " + theNumber);
  }

  function printNumericErrorResult(theNumber: number) {
    console.log("Error was " + theNumber);
  }

  function doItAsync(shouldSucceed: boolean) {
    doExec(shouldSucceed).then((result) => {
      printNumericResult(result);
    }).catch((error) => {
      printNumericErrorResult(error);
    });
  }

  doItAsync(true);
  doItAsync(false);

  console.log("If this shows first, the doItAsync calls are off in asynchronous Promise land!");

  // usual output, but the output order is not guaranteed:
  // If this shows first, the doItAsync calls are off in asynchronous Promise land!
  // Result was 42
  // Error was -1

}