dineshsprabu

import scrapy

from tutorial.items import DmozItem

class DmozSpider(scrapy.Spider):
    name = "dmoz"
    allowed_domains = ["dmoz.org"]
    start_urls = [
        "http://www.dmoz.org/Computers/Programming/Languages/Python/",
    ]

dineshsprabu

/* protos.js*/

var hey = function(){
}

hey.prototype.sayHey = function(){
	console.log('Hey');
}

dineshsprabu

/* The unwanted complication on monk ('_id' as HEX 12-24 bytes) can be handled by using native mongo driver */

var MongoClient = require('mongodb').MongoClient;

/* values to be changed as per need */
var input = {'_id':'string_value'};
var collection_name = 'collection_name';
var db_name = 'db_name';

MongoClient.connect("mongodb://localhost:27017/"+db_name, function(err, db) {

dineshsprabu

String.prototype.replaceAll = function(replace_string,replace_with){
	return this.split(replace_string).join(replace_with);
}

dineshsprabu

var async = require("async");

//series calls the final callback function on every successful execution of the function in the list.

async.series([
  function(callback) {
    setTimeout(function() {
      console.log("Task 1");
      callback(null, 1);
    }, 300);

dineshsprabu

var async = require('async');

async.waterfall(
    [
        function(callback) {
            callback(null, 'Yes', 'it');
        },
        function(arg1, arg2, callback) {
            var caption = arg1 +' and '+ arg2;
            callback(null, caption);

dineshsprabu

/* 
If your package.json file contains "start": "node ./bin/www"
Use the following command to bring up your app with forever
*/

forever start --minUptime 1000 --spinSleepTime 1000 ./bin/www

/* Check list of forever process using the command */

forever list

dineshsprabu

/* The following command will make a fork form the main process
It will log console data to the log file mentioned */

mongod --dbpath='./data' --fork --logpath ./mongod.log

dineshsprabu

/* npm install dns */
var dns = require('dns');

/* domain name to lookup */
domain_name = 'example.com';


dns.lookup(domain_name, function(err, addresses, family){
  /* handle if look up fails inside if condition */
	if(err){return console.log(err.stack);}

dineshsprabu

/* npm install validator */
var validator = require('validator');

/* email id to check */
var email_id = 'email@domain.com' 

/* validator.isEmail can do the job for us */
if (validator.isEmail(email_id)){
	console.log(' valid email ');
}