TypeScript promise

promiseDemo.ts

// A long running thing
doTheThing(a: number, b: number): Promise<boolean> {
  return new Promise<boolean>((resolve, reject) => {
    // Long running call (just pretend, ok?)
    const c = a + b;
    if (c > 0) { 
      resolve(true);  
    }
    else {
      resolve(false);
    }
  });
}
 
// Calling the long running thing
doSomethingWithTheThing() {
  this.doTheThing(1, 1).then((result) => {
    if (result) {
      alert('The thing worked!');
    } else {
      alert('The thing did not worked :(');
    }
  });
}