athap

# This gist demonstrates - How to download data from database in excel or xls format in Ruby on Rails
# Tested with - Ruby 1.9.3, rails 3.2.1, db - postgres

class DownloadsController < ApplicationController
  before_filter :define_header, :except => :index

  def index
    ...
  end

athap

         /*
	 *  | 1  1 |n   |Fn+1  Fn   | 
	 *  | 1  0 |  = |Fn    Fn-1 |
	 * 
         *  Figure 1
	 */
	public int FibonacciLogN(int n)
	{
		if(n <= 0)
			return 0;

athap

# This gist shows how to display Rails like flash messages while handling AJAX or JS requests
# Note - This might not be the best way to do this but it works for me

Step 1. Create a partial which will contain the message to be displayed
        Example - _success.html.erb
        <div id="flash_message">
          <p>Success</p>
        </div>

Step 2. In the Controller, add code to call this partial on a JS request

athap

-----------------------------------------------
application.js
-----------------------------------------------

require [
  'backbone', 
  'path/to/router/with/index/handler'],
   (Backbone, IndexRouter) ->
     $ ->
       Main = new IndexRouter()

athap

class Test
  
  waitForTwoCalls: () ->
    $.when(@firstCall(), @secondCall()).then () =>
      doSomeThing()
  
  firstCall: () ->
    token = $.Deferred
    $.ajax({
      url: foo/bar,

athap

# Makes ajax req to fetch data
class Model
  initialize(id)
    @id = id
  
  load: (token) ->
    $.ajax({
      url: "foo/bar/#{@id}",
      ....
      success: (response) =>

athap

MaxLength = N
valid_string  = some_long_text[0,N] if some_long_text.length > N

athap

var fs = require('fs');
var spawnProcess = require('child_process').spawn;
var filename = 'some/file'

fs.watch(filename, function() {
  var list = spawnProcess('ls', ['-lh', filename]);
  var info = '';
  
  // listener get invoked every time a chunk of data is available. Data is read in chunks
  list.stdout.on('data', function(chunk) {

athap

var MongoClient = require('mongodb').MongoClient;
var connectionString = 'mongodb://localhost:27017/test';
// connect to test db
MongoClient.connect(connectionString, function(err, db) {
  if(err) throw err;
  console.log("CONNECTED");
  
  var q = {name: 'Super Man'};
  
  // query superheroes collection and display result

athap

// Represents the node in the tree. Will be displayed as a small circle in the browser.
// x, y --> x, y co-ordinates of the center of circle
// r    --> radius of the circle
// ctx  --> context of the canvas
// data --> data to be displayed (Only number)

var Node = function(x,y,r, ctx, data) {
  // left child of a node
  this.leftNode = null; 
  // right child of a node