The Joe Codes Blog - Promises --> Creating a new promise

creating-promise.js

// "Producing code"... may be an asynchronous task that takes some length of time
const someValidator = (value) => {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      if (typeof value !== 'string') {
        reject('Error: Value is not a string!');
      } else {
        resolve('Success: Value was a string', value);
      }
    }, 1000);
  });
};

// "Consuming Code"... that must wait for a fulfilled Promise
someValidator('some string')
  .then((value) => console.log(value)) /* code if successful */
  .catch((value) => console.error(value)); /* code if some error */