JSFoo 2014

JavaScript as the centerpiece of a complex web stack

In 2011, Node.js put JavaScript firmly in the backend, making JavaScript developers productive at both ends of the stack, and making it possible for business logic to finally be moved into JavaScript.

In 2012, AngularJS made us think about moving business logic completely into the client-side as an actually sensible idea. Meteor give that idea two thumbs up.

In 2013, we went wild thinking of all the possibilities. JavaScript phones! Robots!

In 2014, it’s time for some sobering up. The backends we built over a decade in Ruby and Python aren’t going away. New languages like Go and Hack are tantalising us with new possibilities. Our applications are increasingly distributed, often involving third party APIs. In such a scenario, where does your business logic reside?

In 2014, JavaScript is no longer a toothless child or a rebellious teenager that wants to do everything itself. JSFoo 2014 is about working with JavaScript as the centerpiece of a complex web stack.


This year’s edition spans four days, with two days of workshops and two days of conference. All days feature a single track. We invite proposals for:

  • Full-length 40 minute talks
  • A crisp 15-minute presentation
  • Sponsored sessions, 40 minute duration
  • Flash talks of 5 minutes duration. Submissions for flash talks will be accepted during the event
  • Three hour workshops where everybody gets their laptop out and follows along

Criteria to submit

You must be a practising web developer or designer, and must be able to show how your own work has advanced the state of the web in the past year. You are expected to present original work that your peers — this event’s audience — recognise as being notable enough to deserve a stage.

If you are excited about someone’s work and believe it deserves wider recognition, we recommend you contact them and ask them to submit a proposal.

Selection Process

Voting is open to attendees who have purchased event tickets. If there is a proposal you find notable, please vote for it and leave a comment to initiate discussions. Your vote will be reflected immediately, but will be counted towards selections only if you purchase a ticket.

Proposers must submit presentation drafts as part of the selection process to ensure that the talk is in line with the original proposal, and to help the editorial panel build a strong line-up for the event.

There is only one speaker per session. Entry is free for selected speakers. HasGeek will cover your travel to and accommodation in Bangalore from anywhere in the world for speakers delivering full sessions (30 minutes or longer). As our budget is limited, we will prefer speakers from locations closer home, but will do our best to cover for anyone exceptional. If you are able to raise support for your trip, we will count that as speaker travel sponsorship.

If your proposal is not accepted, you can buy a ticket at the same rate as was available on the day you proposed. We’ll send you a code.

Commitment to Open Source

HasGeek believes in open source as the binding force of our community. If you are describing a codebase for developers to work with, we’d like it to be available under a permissive open source license. If your software is commercially licensed or available under a combination of commercial and restrictive open source licenses (such as the various forms of the GPL), please consider picking up a sponsorship. We recognize that there are valid reasons for commercial licensing, but ask that you support us in return for giving you an audience. Your session will be marked on the schedule as a sponsored session.

Hosted by

JSFoo is a forum for discussing UI engineering; fullstack development; web applications engineering, performance, security and design; accessibility; and latest developments in #JavaScript. Follow JSFoo on Twitter more

Harsh Kothari


Advanced jQuery Performance Tuning Tips and Tactics

Submitted Jul 14, 2014

jQuery is right now used in every web based application. But everyone has performance issue with jQuery. jQuery makes it quite easy for you to write some pretty inefficient code, so we’ll discuss how to develop in a terse style but with the best possible performance. In this talk I will demonstrate advance jQuery performance tips and tactics so that front end designing and jQuery randering become smooth and optimized and they can get better performance.


People’s understanding on jQuery performance is mostly simplistic. They do not pay attention in small thing of optimization.

  • Optimize selectors to descend from an id if possible.
  • Use tag names when selecting classes and don’t use an excessive number of selectors.
  • Define variables instead of selecting the same object repeatedly.
  • Optimize your code replacing repetition with object oriented functions.

These are common optimization / performance knowledge people have. I will demonstrate advance performance tuning tips in this talk. This will provide idea to people how they can increase the performance of their jQuery code base and optimized performance of their front end or plugins or any other jQuery code.

I will cover:

  • Why everything you’ve learned about the context argument is wrong.
  • Optimal code architecture approaches, e.g. Module Pattern, Constructors, Object Literal
  • Where Sizzle doesn’t optimize where you’d think it would
  • How to write jQuery plugins that are blazingly fast

Speaker bio

This is Harsh Kothari. I am Co-Founder of SeriesQuotes and PyGuj - Python User Group Gujarat. I am working with Wikimedia Foundation for two and half year as a volunteer. I am right now working on Project named : ActivityMonitor. I was google summer of code intern for Wikimedia Foundation in 2013 and also a Google Code In mentor for them as well.

Past Speaking Experience

  • OSCON, USA, 2014
  • PyCon SG, 2014
  • PyGuj - Kick Start event, Ahmedabad, India 2014
  • FOSSASIA, Cambodia, 2014
  • Gnunify, Pune, India 2014
  • FOSDEM, Brussels, Belgium, 2014
  • Open Source Bridge, USA, 2013


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Hosted by

JSFoo is a forum for discussing UI engineering; fullstack development; web applications engineering, performance, security and design; accessibility; and latest developments in #JavaScript. Follow JSFoo on Twitter more