Genlinux

How to prepare for technical questions

noreply@blogger.com (Unknown) — Sun, 8 Feb 2015 20:42:00 -0800

Try to take more challenge questions and definitely you deserves that and for preparation try one of among the below ones

HackerEarth - http://www.hackerearth.com/challenges/
CodeSchool - http://discuss.codeschool.io/
InterviewCake - https://www.interviewcake.com/
HackerRank - https://www.hackerrank.com/
Codeeval - https://www.codeeval.com/
Leetcode - http://leetcode.com/
Geeksforgeek - http://www.geeksforgeeks.org/
CareerCup - http://www.careercup.com/

Javascript : You might also like - I

noreply@blogger.com (Unknown) — Sun, 2 Nov 2014 17:58:00 -0800

Javascript hoisting

What's the difference b/w the two declaration methods below ?

var functionOne = function() {
/* some code */
}
function functionTwo() {
/* some code */
}

functionOne is defined in-place(until that line, functionOne is undefined),
whereas functionTwo is hoisted to the top of the scope and is available
as function throughtout the scope.

Logical Q's

true + true returns 2
Math.min() < Math.max(); will return false

Things you may not know about Javascript

noreply@blogger.com (Unknown) — Fri, 31 Oct 2014 22:04:00 -0700

Object Literal provide a very convenient notation for creating new object values. An object literal is a pair of curly braces surrounding zero or more name/value pairs.

var empty_obj={};
var stooage={"firstname":"Gen","lastname":"Linux"}

Objects can nest.

var flight={
air:"BA",number:"335",departure:{Gate:"45"}
}

Undefined value is produced if an attempt is made to retrieve a non-existent member.

stooage.status // undefined
flight["area] // undefined

Attempting to retrieve values from undefined will throw a TypeError exception.

flight.equipment // undefined
flight.equipment.model // throw "TypeError"

This can be guarded against with the && operator:

flight.equipment && flight.equipment.model // undefined

Reference

Objects are passed around by reference. They are never copied:

var x=stooge;
x.nickname = 'Curly';
var nick = stooge.nickname;
// nick is 'Curly' because x and stooge

// are references to the same object

Function Literal

Function objects are created with function literals:

// Create a variable called add and store a function
var add = function (a, b) {
return a + b;

};

Javascript Interview Questions you might expect

noreply@blogger.com (Unknown) — Tue, 28 Oct 2014 21:58:00 -0700

If you want to through the interview for a Front-end or UI developer then you should know the below questions.

Tell about yourself.
Projects you have worked
How to debug javascript code.
Chrome Developer tools.
What is Closures ?
Strategies in Javascript ?
Difference b/w Object oriented Programming vs Prototype based Programming?
What's the usage of closures ?
What is closures ?
What is event bubbling ?
What is JavaScript Hoisting
Jquery transverse parent() vs parents vs parentuntil ?
In Json what’s the difference b/w dot notation and bracket notation
CSS sprites
Type of data that you're expecting back from the server for Ajax calls.
Which one is faster ID or Class.
Position relative vs Position absolute.
Difference b/w == and ===
Difference between null and undefined
Difference between Display: none and Visibility: hidden ?
Angular - How to pass values from one directive to other ?
Promises in angular ?
Bower search ?
Grunt server ?
How to create objects in javascripts ?
Jquery remove ?
How to select nth li ?
javascript code debug a function { abc} problem
Position : fixed vs static vs absolute
CSS3 colors configuration
Diff b/w bind and on
What is event bubbling and event propagation
What is object chaining ?
What is the scope of this ?
What is jsonp ?
Quirks mode and standard mode ?
How to invoke javascript methods ?
What is this ?
How do u use ajax ?
What is closure ?
Difference b/w scopes vs rule scopes ?
CSS3 transitions
Background - gradient
Javascript inheritance ?
Closures in javascripts ?
Javascript hoisting ?
Promises in Javascript ?
Memory leaks in Javascript ?
How to create objects in javascripts ?
Angular directives ?

warning: Insecure world writable dir /usr/bin in PATH, mode 040777

noreply@blogger.com (Unknown) — Sun, 27 Jul 2014 08:24:00 -0700

If you find this error on your Linux or Ubuntu machines, then you will need to have root access to do this. If you aren't already the administrative user, login as the administrator. Then use 'sudo' to change the permissions:

sudo chmod go-w /usr/local/bin

CSS pointer-events

noreply@blogger.com (Unknown) — Sat, 5 Apr 2014 21:40:00 -0700

CSS property pointer-events allows authors to control under what circumstances (if any) a particular graphic element can become the target of mouse events including CSS hover/active states, click/tap events in JavaScript.

pointer-events property takes eleven possible values.

pointer-events:  auto | none | visiblePainted | visibleFill | visibleStroke | visible | painted | fill | stroke | all | inherit

EX :

.className{

pointer-events: none;

}

View Demo

Someday, I want to learn

noreply@blogger.com (Unknown) — Sat, 29 Mar 2014 19:34:00 -0700

Its been long and ever since, i logged an entry @genlinux. All these days i was looking mostly on MVC client frameworks, ideas behind, developers from all over the world via twitter, sass and assessment puzzles.

Found of lot of young shots doing great on web around 20 and below 24.Myself doesn't be like that.

Also surfed lot of things and come up with some aspirations.

For my web skills

Learn from http://eloquentjavascript.net/contents.html
Fork dailyjs.com
For algorithms - http://cleveralgorithms.com/nature-inspired/index.html

Web development Integrations and Technologies

noreply@blogger.com (Unknown) — Sat, 26 Oct 2013 05:29:00 -0700

INTEGRATIONS

Source Code

Github - Powerful collaboration, code review, and code management for open source and private projects.
Bitbucket - Free source code hosting for Git and Mercurial by Bitbucket.

Hosting Providers

Heroku - Cloud Application Platform.
Engine Yard - Cloud platform for Ruby on Rails and PHP.
Nodejitsu - Simplest, most reliable and intelligent Node.js hosting platform.
dotCloud - Deploy, manage and scale any web app.
Google App Engine - Run your Apps, Host your Sites, Store your Data.
AppFog - Simple PaaS for Java, Node, .Net, Ruby, PHP, MySQL, Mongo, PostgreSQL, and more.

Cloud Providers

Amazon Web Services - Manage, deploy to and restart your AWS servers on a successful build.
Digital Ocean - Simple Cloud Hosting, Built for developers. Deploy an SSD cloud server in 55 seconds!
Rackspace
Google Compute
Joyent
Softlayer

Deployment Tools

Capistrano
Fabric
Chef
Puppet
Ansible
Your Scripts - Install your own tools and run your own scripts and commands to deploy and manage your infrastructure.

Notifications

HipChat
Campfire
Flowdock
Grove.io
Github Status API

TECHNOLOGIES

Languages

Ruby
NodeJS
Python
Dart
PHP
Java
Scala
Groovy
Clojure
Go

Databases

PostgreSql
MySQL
MongoDB
Redis
Memcached
ElasticSearch
SQLite

Browsers

Firefox
Chrome

Test frameworks

Phantomjs
Capybara
CasperJS
Selenium

How to enable JSONP support in a Rails app

noreply@blogger.com (Unknown) — Wed, 23 Oct 2013 17:36:00 -0700

I have known about JSONP format's and the ways to display the data's via jQuery or Angularjs.
I was working on my real-time project tweeplus with rails as Backend and Angularjs as MVC client framework.

When i tried to fetch the json api and render it on my views, i was unable to render it. Rather the json file gets loaded on the page and on chrome console it was showing the Content-Type as application/json .

Later on, i realized as per the jsonp angular docs, we must append JSON_CALLBACK to the URL.

So, How to enable JSONP support in a Rails app?

In a Rails controller where you want to return JSON to a callback function specified in an AJAX request or Angularjs js, simple add a callback key and value (via param[:callback]) to the call to render json:

render :json => your_data_hash, :callback => params[:callback]

When the JSONP AJAX request or Angularjs $http.jsonp request is made and a callback is specified (via the ?callback= param OR the jsonpCallback option in jQuery’s $.ajax() function), Rails will now send back that JSON to the specified callback function in the DOM.

Good learn from my real-time project

Installing maven 3.1.0 on Ubuntu 12.10

noreply@blogger.com (Unknown) — Fri, 27 Sep 2013 22:37:00 -0700

To install Apache Maven 3.1.0 on Ubuntu 12.10, take the following steps

Get the latest maven distribution from http://maven.apache.org/download.cgi

Open the terminal

wget http://www.carfab.com/apachesoftware/maven/maven-3/3.1.0/binaries/apache-maven-3.1.0-bin.tar.gz

2. Unpack the binary distribution

tar zxf apache-maven-3.1.0-bin.tar.gz

3. Move the apache maven directory to /usr/local

sudo cp -R apache-maven-3.1.0 /usr/local/

4. Create a soft link or symbolic link for maven

sudo ln -s /usr/local/apache-maven-3.1.0/bin/mvn /usr/bin/mvn

5. Now mvn -version will print in the terminal as
Apache Maven 3.1.0 (893ca28a1da9d5f51ac03827af98bb730128f9f2; 2013-06-28 07:45:32+0530)
Maven home: /usr/local/apache-maven-3.1.0
Java version: 1.7.0_21, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-7-openjdk-amd64/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.5.0-17-generic", arch: "amd64", family: "unix"

Displaying json array data with Angular JS and ng-grid

noreply@blogger.com (Unknown) — Wed, 14 Aug 2013 21:43:00 -0700

In many projects there comes a time when you’ll need to list some data. It may be a requirement or just an improvement for your users to show the list of products, but you have to decide which of the available options you will use in your application. This article will help you choose the best one, for your app.

In past, i’ve used tables or unordered list a lot bit in the past. So manipulating the data can be tough.
Thankfully there are some libraries available and that have built in functionality for sorting, searching, grouping data, etc.

I have tried with Ng-grid which is basically a Angular Data Grid written in AngularJS and jQuery by the AngularUI Team

AngularJS is a client-side JavaScript framework by Google that makes writing sophisticated, interactive Web apps super easy. AngularJS is a toolset for building the framework most suited to your application development. It is fully extensible and works well with other libraries. Every feature can be modified or replaced to suit your unique development workflow and feature needs.

AngularUI - The companion suites to the AngularJs framework

Getting Started

The first step is to create a blank HTML file and fill it with the following:

<html class="no-js">
<head>
 <meta charset="utf-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
 <meta name="description" content="">
 <meta name="viewport" content="width=device-width">
 <title>Display data with angular-ui ng-grid</title>
 <script src="lib/jquery.min.js"></script>
 <script src="lib/angular.min.js"></script>
<!--[if lt IE 9]> HTML5Shiv
<script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
</head>
<body>

</body>
</html>

Now add references to ngGrid's javascript and css files.In your html file within the controller where you plan to use ng-grid, add:


<div class="gridStyle" ng-grid="gridOptions"></div>

gridOptions is the variable we are going to bind to where we will initialize our grid options, now your html file looks like this:

<html class="no-js" ng-app="myApp">
<head>
 <meta charset="utf-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
 <meta name="description" content="">
 <meta name="viewport" content="width=device-width">
 <title>Display data with angular-ui ng-grid</title>
 <link rel="stylesheet" type="text/css" href="styles/ng-grid.css" />
 <link rel="stylesheet" type="text/css" href="styles/app.css" />
 <script src="lib/jquery.min.js"></script>
 <script src="lib/angular.min.js"></script>
 <script type="text/javascript" src="lib/ng-grid.debug.js"></script>
 <script type="text/javascript" src="js/main.js"></script>
<!--[if lt IE 9]> HTML5Shiv
<script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
</head>
<body ng-controller="MyCtrl">
 <div class="gridStyle" ng-grid="gridOptions"></div>

</body>
</html>

Now apply the basic styles to your grid

.gridStyle {
    border: 1px solid rgb(212,212,212);
    width: 400px; 
    height: 300px
}

In your js file within the controller where you plan to use
ng-grid, lets fetch the json that our grid will use:

var app = angular.module('myApp', ['ngGrid']);
app.controller('MyCtrl', function($scope,$http) {
 $http.get('data/app.json').success(function (data) {
  $scope.myData = data;
 });
 $scope.gridOptions = { data: 'myData' };
});

$http service is a core Angular service that facilitates communication with the remote HTTP servers via the browser's XMLHttpRequest object or via JSONP.

Basic Json schema looks like this


[{"color": "red","value": "#f00"},{"color": "green","value": "#0f0"}]

Note: Here i tried with simple json format and not with the nested json formats

Finally the data list looks like

This is a basic example, checkout ng-grid for more...

Source for ng-grid example ng-grid

Web apps Best Practices: I’ve Been Doing

noreply@blogger.com (Unknown) — Sun, 11 Aug 2013 01:30:00 -0700

I’ve been working on a webapp that uses Jquery, AngularJS for a few months now. As many developers who pick up new things such as Yeoman, Bower.

I learned about Yeoman, Bower & Dev work flow from these video tutorials

Automating Your Front-End Workflow With Yeoman 1.0 - https://www.youtube.com/watch?v=iUQ1fvdO9GY
Paul Irish on Web Application Development Workflow - https://www.youtube.com/watch?v=vDbbz-BdyYc

and adapted these into my web apps projects.Here are the areas where I’m improving my web development, with the aid of the latest and greatest tools:

Your Shell, sexy - Make your shell sexy and understandable, you can try one of these
https://github.com/gf3/dotfiles/blob/master/.bash_prompt
https://github.com/paulirish/dotfiles/blob/master/.bash_prompt

Project layout - It’s important how you structure your directories. You are adding a new feature, and you immediately know where its directives, controllers, and models go. You need to fix a bug in a feature you have not touched in a year, and you know exactly where to look Here’s one example of a proposed structure, it includes lots of good things like tests and places for all the essential parts:

app/ – all of the files to be used in production
- css/ – css files
- img/ – image files
- index.html – app layout file (the main html template file of the app)
- js/ – javascript files
  - app.js – application
  - controllers.js – application controllers
- lib/ – angular and 3rd party javascript libraries
- partials/ – view partials (partial html templates)
config/ – config files for running unit tests with Testacular/Karma
scripts/ – handy shell/js/ruby scripts (run unit tests and dev server)
test/ – test source files and libraries

My web app structure : https://github.com/judearasu/geek If you prefer to start the app with a static web server, then you try https://github.com/gruntjs/grunt-contrib-connect. This plugin requires Grunt ~0.4.0

For creating the web apps in robust, then you can use Yeoman - Modern work flows for web apps which comes with Yo, Grunt & Bower.

Switching the ruby version with rbenv

noreply@blogger.com (Unknown) — Sun, 7 Jul 2013 10:56:00 -0700

Steps to switch the ruby version

$ rbenv versions

List all ruby versions known to rbenv, asterick represents the current version

1.9.3-p0

1.9.3-p385

* 2.0.0-rc2 (set by /home/jude/.ruby-version)

ruby-1.9.3-p385

2. $ rbenv local 1.9.3-p385

Sets the specified ruby version locally

3. $ rbenv global 1.9.3-p385

Sets the specified ruby version globally

Also check that you have the following in your ~/.bash_profile or ~/.bashrc if using bash

export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"

NOTE: Make sure it's the last setting in your ~/.bash_profile . I ran into an issue where I installed a program that updated my .bash_profile and reset PATH.

Undefined local variable or method `current_user' - Devise

noreply@blogger.com (Unknown) — Wed, 20 Mar 2013 09:08:00 -0700

I was working with devise for one my project.Previously i used to create the model as User by default, thereby i didn't found any errors during signing.

But when i had my model as connectz_user i was getting the error "undefined local variable or method `current_user'"
Later, i checked with the devise mail listing group and they informed me to go with current_connectz_user.After implementing the later change on my views, i am not finding the error on my app

Jquery submission of values on keypress

noreply@blogger.com (Unknown) — Sat, 26 Jan 2013 23:14:00 -0800

This was a interview question, where i was asked to create a todo application with any JavaScript framework.

Requirement was to add the daily task and the code shouldn't have any form and submit button.Also the task to be added with the enter key press.

On searching found couple of articles one about the prevention of form on enter key press and other from stackoverflow submitting a form on 'Enter' with jQuery?

Then i come up with my code.

JS Code



$('input').bind("keypress",function (e) {

if (e.which == 13) {

/**Append Logic **/

e.preventDefault();

}

});

JSFiddle

http://jsfiddle.net/judearasu/LTUYw/

Write javascript for loop in ruby

noreply@blogger.com (Unknown) — Sun, 13 Jan 2013 07:46:00 -0800

The JavaScript For Loop resembles the for loop you may have seen in many other programming languages. It is used when you need to do a set of operations many times, with an increment of some kind after each run through the block of code.

for(i=0;i<=10;i++)
{
alert("Counter i = " + i);
}

For loop in ruby

for i in 0..10
   puts "counter i is #{i}"
end

Now i had a javascript for loop with variable incremented to 2

for ( var i = 0; i <=10; i += 2 )
{
alert("Counter i = " + i);
}

Now in ruby i can go with step instead of default for

0.step(10,2) { |i| puts i }

Whats new in rails 3.2.8

noreply@blogger.com (Unknown) — Wed, 10 Oct 2012 07:57:00 -0700

Official link announcing the release of rails 3.2.8

Changes:

Activemodel

Passing of validation helpers changed

Earlier versions

validates :terms, :acceptance => true
validates :password, :confirmation => true
validates :username, :exclusion => { :in => %w(admin superuser) }
validates :email, :format => { :with => %r\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/, :on => :create }
validates :age, :inclusion => { :in => 0..9 }
validates :first_name, :length => { :maximum => 30 }
validates :age, :numericality => true
validates :username, :presence => true
validates :username, :uniqueness => true

Now in rails 3.2.8

validates :terms, acceptance: true
validates :password, confirmation: true
validates :username, exclusion: { in: %w(admin superuser) }
validates :email, format: { with: /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i, on: :create }
validates :age, inclusion: { in: 0..9 }
validates :first_name, length: { maximum: 30 }
validates :age, numericality: true
validates :username, presence: true
validates :username, uniqueness: true

Getting started with Unicorn with rails

noreply@blogger.com (Unknown) — Mon, 1 Oct 2012 23:38:00 -0700

I have doing deploys with mongrel cluster, phusion passenger and ngnix for over two years now.Later on used to work with thin server for development env.

Now rails 3.2 higher version, by default suggest unicorn as the app server.Also github has moved to unicorn.so decided to go with unicorn.

Getting started

Install the gem unicorn

It’s simple to run Unicorn with a bunch of workers and send it commands just like you would in production.

First, create a basic config/unicorn.rb.

#Unicorn minimal configuration 
worker_processes 2
preload_app true
timeout 30
listen 2007

pid "tmp/pids/unicorn.pid"
stderr_path "log/unicorn.stderr.log"
stdout_path "log/unicorn.stdout.log"

after_fork do |server, worker|
  ActiveRecord::Base.establish_connection
end

Here i go with my minimal configuration as my app was in development mode.
Check the docs, or the official example, or the Github sample.

Now start your Unicorn server with config file as

unicorn_rails -c config/unicorn.rb -D.

Finally our app runs with unicorn server at port 2007

My first gem omniauth-miso

noreply@blogger.com (Unknown) — Sun, 8 Jul 2012 10:28:00 -0700

After 3 yrs of my ruby works, today i come with my gem omniauth-miso strategy which currently support with oauth1.0a.I have been contributing on rails documentation, then bored of with the job.Later on decided to go with core.As i spend most of my time management works, i can't able to any ruby contribution.

Later on i had an opportunity to work with a mobile app, using omniauth.I am very much impressed with the omniauth strategy.I don't know the concepts in ruby, but i had the capability to understand, how to use.I used Facebook, twitter & linked in, then i thought of creating my own strategy.So first i tried with mixi (Japanese Social Networking Site), as i can't understand the language, i skipped.Then with bitly which supports Oauth 2.0, but that too was not successful.
Finally tried with miso, the api of miso support Oauth 1.0a.Everything goes fine and i tested on my local app.Am happy to publish my gem on rubygems.org.

Looking forward more on ruby and webdevelopment

Gem : Omniauth-miso version : 0.0.2

Interviewing ruby on rails developers

noreply@blogger.com (Unknown) — Mon, 14 May 2012 09:35:00 -0700

I was with ruby on rails web development for past 4 yrs.In this 4 yrs i have attended several ruby on rails interviews.Out of 25, i can say just 5 of them have asked a better one.Till now most of companies have asked the question which was taken from the Google, some of the questions are

Whats the difference between dynamic scaffolding & Static scaffolding ?

Whats the difference between Symbol & String?

Whats the use of flash and session?

How we can access multiple database.?

How we can access ajax calls on controller?

Some times, if a interviewer is on diff tech background then he will ask the above questions definitely added he will be asking the questions from his own stream (Ex : JavaScript, Sql or any scenario questions). Once i attended a top mnc company, they just asked did you know how to work on rspec, internalization and whats the team size of your current project.The worse thing of another interview was, the interviewer prepared a set of questions on paper and he just asked one by one.

What is class, Object, Superclass?

Whats is the use of attr_accessible?

Whats the difference between has_many :through and HABTM

If our interviewer is a database developer, then the questions will be on database. And there seems to be no questions on Rails.Some times if the interviewer is having less yrs of exp than the candidate. Then he will fire out the questions as if he seems to be master behind the rails framework. Not but not least, one of my friend has taken an interview with a product based company,as the interviewer is from Java he has asked the questions, which seems to be like this

What do you mean by private variable

What is static methods

How many levels of inheritance is there on ruby

When Dave Thomas Meta programming screen casts becomes popular, all of a sudden asking on Meta programming. Among these interviews, some interviewers from MCCAFEE & AT&T will ask only about the project and the technologies we are using on it.
Finally, very small amount of companies are asking genuine questions to the candidate.Sending a scenario and asking then to do with design patterns.Also they won't worry about rails, they just go with ruby and test cases.

*Note

These are all my personal thoughts, if any of the context harms any one.We apologize for this.

Capitalizing the words within a string

noreply@blogger.com (Unknown) — Sat, 5 May 2012 23:31:00 -0700

Code to capitalize the words within a string

string.split.map(&:capitalize).join ' '

Migrating Git repository from Beanstalk to Github

noreply@blogger.com (Unknown) — Tue, 1 May 2012 10:37:00 -0700

For some reasons we were about to move our private repository from Beanstalk to Github.At first i cloned the private repo to my system

$ git clone git@ovcom.beanstalkapp.com:/mongo_git.git

Meanwhile i created a new repo named ui_mongo on Github.Also i renamed the mongo_git to ui_mongo on my local system

$ mv mongo_git ui_mongo

Then i changed the git configuration file which contains the url mapped with beanstalk repo to github repo

$ vim ~/Workz/ui_mongo/.git/config

[remote "origin"]
        fetch = +refs/heads/*:refs/remotes/origin/*
        #url = git@ovcom.beanstalkapp.com:/mongo_git.git
        url = git@github.com:ov/ui_mongo.git

Now i used when with a normal git push commands to push the files to master.

$ cd ~/workz/ui_mongo
$ git add remote origin git@github.com:ov/ui_mongo.git
$ git commit -m 'code migrated from bean to github'
$ git push master

Now i am able to find users commits with beanstalk repository on Github.Thus i have safely migrated my code from beanstalk to Github

Create new user in Ubuntu Linux from terminal

noreply@blogger.com (Unknown) — Wed, 14 Mar 2012 10:59:00 -0700

Use useradd command create a new user

useradd <username>

For setting up a password

passwd <username>
Enter a new unix password:
Repeat the new password:

To create a directory while adding a user account.Use -m switch to create home directory for new user.

useradd -m -s /bin/bash <username>
passwd <username>

eventmachine - failed to build the gem

noreply@blogger.com (Unknown) — Sat, 18 Feb 2012 20:12:00 -0800

While i was trying to install rails 4.0.0 beta.I got stuck up with eventmachine gem failing all the way.

/home/jude/.rbenv/versions/1.9.3-p0/bin/ruby /home/nthillaiarasu/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/eventmachine-0.12.10/ext/extconf.rb
checking for rb_trap_immediate in ruby.h,rubysig.h... no
checking for rb_thread_blocking_region()... yes
checking for inotify_init() in sys/inotify.h... yes
checking for writev() in sys/uio.h... yes
checking for rb_thread_check_ints()... yes
checking for rb_time_new()... yes
checking for sys/event.h... no
checking for epoll_create() in sys/epoll.h... yes
creating Makefile
---> ext/fastfilereader
/home/jude/.rbenv/versions/1.9.3-p0/bin/ruby /home/jude/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/eventmachine-0.12.10/ext/fastfilereader/extconf.rb
creating Makefile
<--- ext/fastfilereader
<--- ext
---> lib
---> lib/evma
<--- lib/evma
---> lib/em
---> lib/em/protocols
<--- lib/em/protocols
<--- lib/em
<--- lib
---> ext
make
compiling ed.cpp
make: g++: Command not found

Later i looked on the site http://isitruby19.com/eventmachine, there bunch of people had the same problem.Then from the error logs, it seems g++ is needed.Then i installed g++ in my ubuntu 11.10.

Now eventmachine got installed successfully.

nth-child selector for IE 7 browsers

noreply@blogger.com (Unknown) — Sun, 12 Feb 2012 08:39:00 -0800

I have been developing a static template for T.Works and need to validate for IE7 & firefox browsers.As per the requirement, i have been implementing the navigation via image sprite.

For the navigation, i need to fix the width of the third li to be 150px, which will be greater than other li.In the CSS, i have used the nth-child() pseudo selector.It works fine for firefox browsers, but the pseudo element selector was not supported by IE 7 browsers.Then i tried with appending the nth li with other li and it works fine for IE7 browsers.

/* standard nth */
 ul#nav li:nth-child(3) {
 width: 151px !important;
}

Works in Firefox not in IE 7.

/* IE nth */
ul#nav >li + li + li
{
    width: 151px !important;
}

Works in Firefox & IE 7.

Note:This fix has been tested and implemented in IE 7 browsers.