Question about Scope in Javascript

module1.js

var module2 = require('./module2');

// will return the same exact output from console.log as inside the module
module2.function1(); 
module2.function2();

// If you want to get around this, you will want to pass the variables, or set them inside the proper scope

var module3 = require('./module3');

// We can pass publicVariable into module3 if we need to.
module3(module2.publicVariable);

module2.js

var insideScopeModule2 = true;
var PublicVariableWeGiveAccessToThroughExports = true;

var function1 = function(input1) {
  var variableInsideFunction1 = true;
  console.log(insideScopeModule2); // will return true always because of the scope it is executing in.
};

var function2 = function(input2) {
  console.log(variableInsideFunction1); // will always return undefined unless we somehow pass it to this function
};

exports.function1 = function1;
exports.function2 = function2;
exports.publicVariable = PublicVariableWeGiveAccessToThroughExports;

// exports is equivalent to 
// module.exports = { function1: function1, function2: function2 };
// http://stackoverflow.com/questions/7137397/module-exports-vs-exports-in-node-js

module3.js

var privateVariableToModule3 = true;


var privateFunction = function() {
  // This function is never exported, therefore will never be able to be accessed outside of this module.
  // It does have access to everything inside of here, though.
  
  var onlyInsideofPrivateFunction = true;
};

var publicFunction = function(input) {
  // has access to both the private and public inside of here
  
  // We can access the input variable though, and use anything passed into the function:
  var publicVariableFromModule2 = input.publicVariable;
  
  // we can use that input however we want.
};

module.exports = publicFunction;