Simple node require example

main.js

/* jshint node:true, es3:false */

// we need some complex maths functions :)
var maths = require('./maths');

console.log(maths.XplusY(2, 4));
console.log(maths.XtimesY(2, 4));

maths.js

/* jshint node:true, es3:false */

// the maths module handles all your complex calulations

exports.XplusY = function(x, y){
    return x + y;
};

exports.XtimesY = function(x, y){
    return x * y;
};