This document discusses fetching stock statistics from Yahoo Finance and saving them to a Google Sheet using Node.js. It provides an overview of Node.js, describes the packages and code needed to make requests to Yahoo Finance and parse the response, and shows how to upload the data to a Google Sheet spreadsheet. Key steps include using the Request and Cheerio packages to fetch and parse the Yahoo Finance data, storing it in arrays, and then using the Edit Google Spreadsheet package to upload it to a specified Google Sheet worksheet.

1. Fetch Statistics from the
Yahoo Finance and save it
into a Google Sheet
document

2. About me
• An Engineering Student at the International Institute of
Technology
• Article Writer at CodeProject.com

3. What is Node.js?
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A powerful platform to let you run JS on the server side
How? Uses Google’s V8 Engine
V8 is built in C
V8 is the fatest JS Engine on the planet
Great way to build modern web apps on both Client and
Server side!

4. Timeline
July 2011
Nov 2010
Cloud9IDE
launches
Jan 2009
Created Ryan Dahl
2009
April 2010
Heroku launches
node support
2010
July 2010
Yammer adopts
node.js
Nov 2011
Windows Azure
support
LinkedIn adopts
node for mobile
platform
port to Windows
EBay releases API
built on node
Cloud9IDE azure
support
IISNode
2011
Oct 2011 node.js
overtakes Ruby as
most popular
repo on gitHub
Walmart
Launch mobile
site on node.js
Feb 2012
App Harbour
support
2012

5. Companies support Node.js
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Yahoo!
Microsoft
LinkedIn
Ebay
Fidelizoo
Paypal
CHESS
…

6. What Can I Do in Node?
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Anything you want!
Chat servers, Analytics & Crazy fast backends
Socket.io library is a wicked way to build real time apps
Build a social Network! LinkedIn, Dropbox all using Node.js

7. What Can’t I Do in Node?
• Contradicts previous slide but
 Node.js is not a web framework i.e Sinatra
 Modules for node.js make it into web framework i.e Express
 Node.js is not Multi-threaded
 A single thread to rule them all

8. Non-Blocking? Blocking? I’m so confused
• By introducing callbacks. Node can move on to
other requests and whenever the callback is
called, node will process is.
• You should read non-blocking code as « put
function and params in queue and fire
callback when you reach the end of the
queue »
• Blocking= return Non-Blocking= no return.
Only callbacks

9. Fetch Statistics from the Yahoo Finance
• We have to fetch data from the link shown
below:

http://finance.yahoo.com/q/ks?s=LVS
The Company in our example is LVS.

10. Fetch Statistics from the Yahoo Finance
• You need to install Node.js Of course and it 3 packages:
 npm install request – So we could work with URLs in an easy
way.
 npm install cheerio – jQuery for the server side. This will make
the code 10x shorter.
 npm install edit-google-spreadsheet – to integrate with
Google docs/sheets with 2-3 lines of code.

11. Fetch Statistics from the Yahoo Finance
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// Some parameters
var ticker = "LVS";
var yUrl = "http://finance.yahoo.com/q/ks?s=" + ticker;
var financeDetails = new Array();
var keyStr = new Array();

12. Fetch Statistics from the Yahoo Finance
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// The main call to fetch the data, parse it and work on
it.
request(yUrl, function (error, response, body) {
if (!error && response.statusCode == 200) {
var $ = cheerio.load(body);
// the keys - We get them from a certain class attribute
var td = $('.yfnc_tablehead1');
$(td).each(function(j, val) {
keyStr[j] = $(val).text();
});

13. Working with Google Sheet Document
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// upload our data to Google sheet
Spreadsheet.create({
debug: true,
username: 'TODO-fill',
password: 'TODO-fill',
debug: true,
spreadsheetName: 'TODO-yourSheetName',
worksheetName: 'TODO-Sheet1orAbetterName',
callback: sheetReady
});

14. Demo

15. Thank you
hadrichmed@gmail.com