Ankur Bansal krazylearner

Yes, it is a bad practise. A constructor should return an instance of its class, nothing else. It would mess up the new operator and inheritance otherwise.

Moreover, a constructor should only create and initialize a new instance. It should set up data structures and all instance-specific properties, but not execute any tasks. It should be a pure function without side effects if possible, with all the benefits that has.

What if I want to execute things from my constructor? That should go in a method of your class. You want to mutate global state? Then call that procedure explicitly, not as a side effect of generating an object. This call can go right after the instantiation:

var engine = new Engine()
engine.displayPosts();

Frontend Development

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Show User

Returns json data about a single user.

URL

/users/:id
Method:

	<IfModule mod_rewrite.c>
	RewriteEngine On
	RewriteBase /
	Redirect 410 /
	</IfModule>

	What I do on my cloud instances is I redirect port 80 to port 3000 with this command:

	sudo iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3000
	Then I launch my Node.js on port 3000. Requests to port 80 will get mapped to port 3000.

	You should also edit your /etc/rc.local file and add that line minus the sudo. That will add the redirect when the machine boots up. You don't need sudo in /etc/rc.local because the commands there are run as root when the system boots.

	Logs
	Use the forever module to launch your Node.js with. It will make sure that it restarts if it ever crashes and it will redirect console logs to a file.

	//1
	///////////Antipattern///////////
	function Apple (type) {
	this.type = type;
	this.color = "red";
	// anti-pattern!
	this.getInfo = getAppleInfo;
	}

	// anti-pattern!

	/////////////antipattern///////////
	function Apple (type) {
	this.type = type;
	this.color = "red";
	this.getInfo = function() {
	return this.color + ' ' + this.type + ' apple';
	};
	}

	///////////CORRECT///////////

	/**
	* Get a random floating point number between `min` and `max`.
	*
	* @param {number} min - min number
	* @param {number} max - max number
	* @return {float} a random floating point number
	*/
	function getRandom(min, max) {
	return Math.random() * (max - min) + min;
	}

	// generates 4 bytes token
	var outname = require('crypto').randomBytes(4).toString('hex');

	var mongoose = require('mongoose');

	mongoose.connect('mongodb://localhost:27017/my_databasetest');

	var Schema = mongoose.Schema;
	var ObjectId = Schema.Types.ObjectId;

	var UserSchema = new Schema({
	name: String,
	friends: [{type: ObjectId}]