/*
Node wraps every .js file in a module function, which creates file-level scope. In contrast, all files are part of global scope (window object) for js in browser. To use functions from one module in another, it is necessary to export/import.

A property of the wrapper function is module.exports. It exists as an empty object if no exports have been defined. Exporting is is as simple as adding functions/vars to the module.exports object with module.exports = function or var. To import, use the requires(<path to export module>) method.

In the code below, function doesSomething is exported from file1.js and imported in file2.js
*/

// EXPORT
// file1.js
function doesSomething() {
  // block of code
  return something;
}

// style 1
module.exports.doesSomething = doesSomething; // exports entire module.exports object

// style 2
module.exports = doesSomething; // exports only the function

// IMPORT
// file2.js
const importedFunc = require('relative-path-to-module'); // if in same dir, (./module). Note file extension absent.