Javascript – Module, Module.Exports & related Best Practices

var drawTraingle = function() {
 console.log("Traingle drawn");
}

var drawCircle = function() {
 console.log("Circle drawn");
}

Above code could be saved as draw.js. The file draw.js could be used to represent a module representing functions to draw different shapes. As per this page, module.exports is the object that’s actually returned as the result of a require call.

module.exports = {
    drawTraingle: function() {
        console.log("Traingle drawn");
    },

    drawCircle: function() {
        console.log("Circle drawn");
    }
};

The above code could also be written as following:

var drawTraingle = function() {
    console.log("Traingle drawn");
};

var drawCircle = function() {
    console.log("Circle drawn");
};

exports.drawTraingle = drawTraingle;
exports.drawCircle = drawCircle;

Following code represents how the above function can be used in other file, say, main.js

var d = require("./draw.js");

d.drawTraingle();
d.drawCircle();

Pay attention to usage of “require” function.

node main.js

It would print following:

Traingle drawn
Circle drawn