HackerEarth.com

www.hackerearth.com/problems
For practicing programming

Ruby: Metaprogramming related

http://rubylearning.com/blog/2010/11/23/dont-know-metaprogramming-in-ruby/

Rails: Deface related

http://deface.heroku.com/

'React' as an alternative to Angular, Knockout etc

http://blog.dantup.com/2014/08/you-have-ruined-html/

http://facebook.github.io/react/

Hash Collisions

http://preshing.com/20110504/hash-collision-probabilities/

Bootstrap tutorial

http://www.tutorialspoint.com/bootstrap/bootstrap_input_groups.htm

Ruby, Rails related

RubySteps – a daily coding practice

http://patmaddox.com/rubysteps/

UI related: Bootstrap Snippets

Bootstrap Snippets like Login Form, Sign-in Form, User Profile etc
http://snipplicious.com/

Prezi.com - tool to create presentations

Website to create Presentations: https://prezi.com
Free option - presentations that we create will be public

Tool to use when accessing Exchange email using a web-browser (Using Javascript Code in Bookmarks - Part II)

I created a small tool to use when accessing my company's Exchange email using a web-browser 

STEP 0:
Drag the below link to your Bookmarks bar

Email Tool

STEP 1-3:
See below pic

Javascript related

http://casual-effects.blogspot.ca/2014/01/an-introduction-to-javascript-for.html

Module

There are several ways of using functions to group state and implement module-like functionality. The simplest is to have modules be objects that contain functions (and constants, and variables...). 

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use strict;   var module = (function() {   // This cannot be seen outside of the module, so it will not create namespace   function aPrivateFunction(z) { return Math.sqrt(z); }     // Freezing and sealing are two ways to prevent accidental mutation of the   // module after creation.   return Object.freeze({      // These are accessible as module.anExportedFunction after the definition      anExportedFunction: function(x, y) { return x + aPrivateFunction(y); },      anotherExportedFunction: function(x) { return 2 * x; }   }); })();

Another variation mutates the global namespace object: 

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use strict;   // Use function to create a local scope and persistent environment (function() {   function aPrivateFunction(z) { return Math.sqrt(z); }     // Mutate the global environment   this.anExportedFunction = function(x, y) { return x + aPrivateFunction(y); };   this.anotherExportedFunction = function(x) { return 2 * x; }; })();