Extending the Substack Pattern

Consider a common module.exports pattern below:

module.exports = function (message) {
  console.log('info: ' + message);
};

A possible extension of this pattern is using the exported function as namespace for other public APIs. This is a very powerful combination, because it still gives the module the clarity of a single entry point (the main exported function), but it also allows us to expose other functionalities that have secondary or more advanced use cases.

Extending the Substack Pattern:

module.exports.verbose = function (message) {
  console.log('verbose: ' + message);
};

Usage example:

var logger = require('./logger');
logger('This is an informational message');
logger.verbose('This is a verbose message');

This pattern is great to give emphasis on a single functionality whilst still providing secondary features that are less visible.