01-tOSU-pinkie-promise-snippet1.js

//Sourced from https://github.com/TheOpenSourceU/pinkie/blob/tOSU/article/index.js#L170
function Promise(resolver) {
  if (typeof resolver !== 'function') {
    throw new TypeError('Promise resolver ' + resolver + ' is not a function');
  }

  if (this instanceof Promise === false) {
    throw new TypeError('Failed to construct \'Promise\': Please use the \'new\' operator, this object constructor cannot be called as a function.');
  }

  this._then = [];

  invokeResolver(resolver, this);
}

02-tOSU-pinkie-invokeResolver-snippet1.js

// Sourced from https://github.com/TheOpenSourceU/pinkie/blob/tOSU/article/index.js#L34
function invokeResolver(resolver, promise) {
  function resolvePromise(value) {
    resolve(promise, value);
  }

  function rejectPromise(reason) {
    reject(promise, reason);
  }

  try {
    resolver(resolvePromise, rejectPromise);
  } catch (e) {
    rejectPromise(e);
  }
}