Alternate Promise Syntax

index.js

// Set up a promise
const promise = new Promise((resolve, reject) => {
  const number = Math.floor(Math.random() * 2);
  setTimeout(() => {
    if (number > 0) {
      resolve('Success!');
    } else {
      reject('Failure!!!');
    }
  }, 2000);
});

const succeed = (data) => console.log(data);
const fail = (err) => console.error(err);

// Normal then/catch
promise
  .then(succeed)
  .catch(fail);

// ...but you can also do this:
promise.then(succeed, fail);

// The first way makes more sense semantically - you call the promise *then* do something, and you
// *catch* errors if they occur

// The second way shortens the final handling of the promise at the expense of immediate clarity.