• Snapshot Testing

    Snapshot Testing is a recent technique in unit testing and automated testing in general that's been gaining some traction, thanks to a new excellent test runner called Jest. Gleb Bahmutov from Cypress.io will explain to us what snapshot testing is, and how to use his family of NPM modules snap-shot-* to go beyond static data. Presented at Atlanta JS Meetup

    Created Sep 17th, 2017 124 0

  • Effect E2E Testing with Cypress

    The testing pyramid is a bad bad practice; it puts focus on unit tests, while your users really care about an end to end quality. For web developers, we are open sourcing a very powerful E2E tool called Cypress that is capable of giving your confidence that the app is going to work. Presented at AngularDevSummit 2017

    Created Sep 10th, 2017 346 0

  • Hello HTTP!

    Let's walk through the history of HTTP, its original design goals and how they shape the modern Internet. We will look at the current standard, and what is coming tomorrow. We will also learn and refresh a whole bunch of acronyms: TCP, HTTP, RFC, IETF, UPD, QUIC. Every developer working or even using WWW will benefit from this presentation.

    Created Sep 4th, 2017 174 1

  • Shapes of Development

    A geometric shape is simple to remember and visualize concept, familiar to any child. In software development we have a few concepts with associated shapes: agile is shown as a spiral curve, waterfall as, well, a waterfall, etc. In this presentation I will show the shapes that describe other modern development approaches and architectural styles.

    Created Jul 24th, 2017 267 0

  • Shhh, don't tell anyone but you are using HTTP/2!

    I will walk through the history of HTTP, its original design goals and how they shape the modern Internet. We will look at at the current standard, and what is coming tomorrow. Through the presentation I will point at some security issues already found with HTTP/2 and its implementation.

    Created Jul 8th, 2017 243 0

  • It's not your parents' HTTP

    The Internet of simple textual requests and responses is done. Finished. Obsolete. The modern web is a web of binary, persistent connections like WebSockets, WebRTC and HTTP/2. Presented at NDC Oslo 2017

    Created May 23rd, 2017 395 1

  • Pure Magic: Functional Reactive Web Applications in 2017 and Beyond

    There are a few web frameworks that are all the rage right now: React, VueJs, but which frameworks are functional AND reactive? Dr. Gleb Bahmutov will talk about functional reactive web applications you can write today, and why they are going to rock tomorrow. Presented at Maine.JS meetup in May of 2017

    Created May 6th, 2017 1,169 5

  • Web app quality beyond testing - CycleConf 2017

    What makes a framework great? How do you have others give it a try? How do you make sure the web application runs correctly? What is a brass ball valve? Video at https://vimeo.com/album/4578937/video/216829554

    Created Apr 2nd, 2017 1,248 0

  • Self-improving software - NodeWeek

    Every JavaScript project requires 3rd party modules. As soon as you depend on specific versions, your module falls behind. I will show how to keep your software up to date without any effort (as long as there are some tests). Everything will be automated and reliable; it is like bringing an army of robots to help you.

    Created Mar 13th, 2017 676 1

  • Self-improving software - ConFoo CA 2017

    Every JavaScript project requires 3rd party modules. As soon as you depend on specific versions, your module falls behind. I will show how to keep your software up to date without any effort (as long as there are some tests). Everything will be automated and reliable; it is like bringing an army of robots to help you.

    Created Mar 4th, 2017 641 2

  • Remove the boilerplate - ConFoo CA 2017

    In this talk I will show how to remove lots and lots of unnecessary code from your application. Counter variables, wrapper functions, callbacks - they can all be removed using utility libraries or even built-in JavaScript ES5 language features. In each instance there will be a lot less code, but it will be more robust, manageable and simpler to reason about and test. Presented at ConFoo.CA in March 2017

    Created Mar 4th, 2017 794 1

  • Snapshot Testing the Hard Way

    Testing is hard and does not pay. Snapshot testing is a way to increase the efficiency of your unit tests while removing a lot of boilerplate code. Recently Jest and Ava testing framework added this feature. I have written a framework-agnostic snapshot testing library and would like to share techniques and design decisions that went into this library.

    Created Feb 22nd, 2017 885 1

  • Writing Software That Works

    How to write software that works now and will keep working in the future. Plus career advice! Presented as a guest lecture at MIT 6.148 class, January 20th 2017. Developer value, JavaScript modules, semver, linting, unit testing, e2e testing.

    Created Jan 17th, 2017 5,744 34

  • Browser is the new server - NodeFest Tokyo

    The line between the server and the modern browser is blurry. Transpiling code, rendering static markup, smart caching were traditionally done on the server. These features made the jump to the browser by using ServiceWorkers.

    Created Nov 13th, 2016 4,671 3

  • Browser is the new server - NodeConf EU

    The line between the server and the modern browser is blurry. Transpiling code, rendering static markup, smart caching were traditionally done on the server. These features made the jump to the browser by using ServiceWorkers. Video at https://www.youtube.com/watch?v=5zOaN_FYXwk

    Created Oct 1st, 2016 994 0

  • Secure your Angular Applications

    What do Chrome extensions written in Angular and secure websites have in common? They take Content Security Policy seriously! In this presentation I will show how to secure your web application against cross-site scripting attacks and insecure 3rd party code.

    Created Sep 5th, 2016 1,892 1

  • Fun* JavaScript Workshop

    The principles and basics of functional programming in JavaScript using small coding problems. Pure functions, partial application, composition, iteration, lexical scope, Ramda library.

    Created Jul 31st, 2016 2,713 0

  • Cycle.js: Get in the Loop

    Cycle.js - functional reactive framework for pure web apps. Presented at FrontEndCamp at United Nations NYC July 2016. Links and additional resources at https://glebbahmutov.com/blog/cyclejs-frontendcamp/

    Created Jul 10th, 2016 3,071 1

  • Which JavaScript framework should I use next? - BuzzJS NYC 2016

    Should I learn and use Angular 1, React, Angular 2, Ember or something else? What are the common features they all share? How are they different? Are there "better" frameworks that will be popular next year? I will show a couple of new approaches that should be part of any future-proof framework: reactive streams for managing the data flow, virtual DOM abstractions for speed, testability and performance tools built right into the framework. The presentation might be controversial, but the struggle to pick "the next best thing" is very real. Video at https://www.youtube.com/watch?v=ji8hqDi2BnA

    Created May 27th, 2016 4,118 3

  • From procedural to reactive JavaScript with stops - O'Reilly OSCON

    How do we convince / train developers used to imperative programming style to switch to functional or even reactive programming? I show the same example implemented in multiple styles to highlight the advantages one would get by going from imperative to object-oriented, functional, lazy evaluation, promise-based, event emitters, and finally reactive approach. The short examples are in JavaScript - the most widely used functional language today.

    Created May 16th, 2016 2,576 0

  • MVC to FRP

    Transition from the traditional Model-View-Controller application to Functional-Reactive-Programming. Presented at CycleConf 2016. Video at https://www.youtube.com/watch?v=-PCq4pXaDZw and all links are in blog post https://glebbahmutov.com/blog/cycle-conf/

    Created Apr 19th, 2016 2,924 0

  • Secure the front end from Node server - Boston Code Camp 25

    This presentation will show how to lock down the front end JavaScript code using Content-Security-Policy. I will also show how to prevent sensitive files from being committed to your repos or NPM registry. Presented at Boston Code Camp 25 on April 2nd 2016.

    Created Mar 31st, 2016 1,105 2

  • Remove the boilerplate - Boston Code Camp 25

    How to remove unnecessary code from your code, including asynchronous code and unit tests. Presented at Boston Code Camp 25 on April 2nd 2016

    Created Mar 30th, 2016 1,004 2

  • Workers of the world, unite!

    ServiceWorkers for faster web application boot up. Instant web applications, self-rewriting apps, profiling, ES2015 and modern browsers. Presented at the Web Performance NYC meetup. Video https://youtu.be/4axZ3D75Llg

    Created Mar 13th, 2016 1,667 2

  • Remove the boilerplate - NationJS

    How to remove unnecessary code from your code, including asynchronous code and unit tests. Presented at NationJS Node day 2016 in Washington DC.

    Created Mar 7th, 2016 1,601 3

  • Unit testing AngularJS - ConFoo.ca

    Testing Angular code requires too much boilerplate. In this presentation I will show ng-describe - a BDD helper that removes all extra code and allows to start unit testing in seconds.

    Created Feb 22nd, 2016 1,109 0

  • NodeJS for secure websites

    This presentation will show how to lock down the front end JavaScript code using Content-Security-Policy. I will also show how to prevent sensitive files from being committed to your repos or NPM registry

    Created Jan 20th, 2016 1,170 0

  • Journey from imperative to reactive JavaScript with stops - Boston Code Camp 24

    How do we convince / train developers used to imperative programming style to switch to functional or even reactive programming? I show the same example implemented in multiple styles to highlight the advantages one would get by going from imperative to object-oriented, functional, lazy evaluation, promise-based, event emitters, and finally reactive approach. The short examples are in JavaScript - the most widely used functional language today.

    Created Nov 14th, 2015 1,651 0

  • Explain with examples, without writing any

    Humans learn best by example; good technical docs use lots of them. Yet all modern documentation tools (think jsdoc) making writing correct examples and maintaining them a chore. There is no tool support for syntax highlighting, or even guarantee that an example is correct or up to date. On the other hand, solid software projects have lots of well tested, up to date examples. We call them unit tests! In this presentation I will show how to take the unit tests and transform into syntax-agnostic human-friendly examples to be plugged into your docs.

    Created Oct 22nd, 2015 1,152 0

  • Обзор будущих технологий тестирования / Testing technologies of the future

    В этом докладе я покажу самые последнии идеи для достижения надежного программного обеспечения для веб: от data-coverage (вместо code-coverage) до тестирования недоступого кода (например, внутри private JavaScript closures), от минимизации boilerplate до тестирования веб-приложений без помощи браузеров; эти решения помогут быстро и дешево достичь высокого уровня качества.

    Created Oct 22nd, 2015 1,632 2

  • Turn the performance knob to 11

    Once your Angular application has the features you need, the next step is usually focused on improving its performance, such as the initial load time and responsiveness to user’s commands. The application has to execute quickly in order to be useful. Is the Angular framework fast or slow? I argue that it is very fast, but requires you to know how to measure and optimize the right bottlenecks.

    Created Oct 14th, 2015 2,493 0

  • Remove the boilerplate

    How to remove unnecessary code from your code, including asynchronous code and unit tests. Presented at NodeJS Italy in 2015

    Created Oct 6th, 2015 1,607 0

  • MIT Career Fair

    A presentation for prospective candidate who are interested in joining Kensho. What we do, how we do it, why someone should join us, and how to ace our interview.

    Created Sep 20th, 2015 1,121 0

  • Unit testing AngularJS - Angular Remote Conf

    Testing Angular code requires too much boilerplate. In this presentation I will show ng-describe - a BDD helper that removes all extra code and allows to start unit testing in seconds. Then I will show ng-dice - a combination of dependency injection and code extraction for testing Angular taking advantage of Node require hooks.

    Created Sep 19th, 2015 1,194 0

  • Effective public speaking

    A few tips for organizing and delivering an effective presentation by carefully preparing the content

    Created Sep 16th, 2015 1,550 2

  • Bend the JS rules in Angular application

    Bend the JavaScript rules for powerful Angular applications: access the controller logic from the browser console, mock on the fly, load app from Node, unit test private functions. Presented at ManhattanJS meetup.

    Created Sep 9th, 2015 1,459 0

  • Unit testing AngularJS

    Testing Angular code requires too much boilerplate. In this presentation I will show ng-describe - a BDD helper that removes all extra code and allows to start unit testing in seconds.

    Created Aug 7th, 2015 7,457 5

  • Self-improving software FrontEnd Camp

    Any JavaScript project requires 3rd party modules. As soon as you depend on specific versions, your module falls behind. I will show how to keep your software up to date without any effort (as long as there are some tests). You can automatically upgrade dependencies for an individual project, a collection of projects. You can even see the anonymous version upgrade results across the public projects around the world to judge if a particular update is likely to succeed. What about projects that depend on your software? Before releasing a new version, you can test some or all of your dependencies against the new code.

    Created Jul 18th, 2015 1,716 2

  • Journey from procedural to reactive JavaScript with stops - FrontEnd Camp

    How do we convince / train developers used to imperative programming style to switch to functional or even reactive programming? I show the same example implemented in multiple styles to highlight the advantages one would get by going from imperative to object-oriented, functional, lazy evaluation, promise-based, event emitters, and finally reactive approach. The short examples are in JavaScript - the most widely used functional language today.

    Created Jul 16th, 2015 1,708 0

  • Self-improving software NYC NodeJS meetup

    Any JavaScript project requires 3rd party modules. As soon as you depend on specific versions, your module falls behind. I will show how to keep your software up to date without any effort (as long as there are some tests). You can automatically upgrade dependencies for an individual project, a collection of projects. You can even see the anonymous version upgrade results across the public projects around the world to judge if a particular update is likely to succeed. What about projects that depend on your software? Before releasing a new version, you can test some or all of your dependencies against the new code.

    Created Jul 15th, 2015 1,521 0

  • web application profiling using code snippets

    Chrome DevTools code snippets became my favorite tool when investigating performance bottlenecks in web applications. A JavaScript fragment can be stored as a named snippet in the "Sources" DevTools panel and executed in the current page's context, just as if it were a code executed in the browser's console.

    Created Jun 25th, 2015 1,292 1

  • Self-improving software

    Any JavaScript project requires 3rd party modules. As soon as you depend on specific versions, your module falls behind. I will show how to keep your software up to date without any effort (as long as there are some tests). You can automatically upgrade dependencies for an individual project, a collection of projects. You can even see the anonymous version upgrade results across the public projects around the world to judge if a particular update is likely to succeed. What about projects that depend on your software? Before releasing a new version, you can test some or all of your dependencies against the new code.

    Created Jun 23rd, 2015 1,405 2

  • An orchestra of rockstars

    Hiring, training and graduation approaches that work for us at Kensho (data analysis and machine intelligence company in Boston and NYC)

    Created Apr 30th, 2015 1,194 0

  • Journey from procedural to reactive JavaScript with stops - ScotlandJS

    How do we convince / train developers used to imperative programming style to switch to functional or even reactive programming? I show the same example implemented in multiple styles to highlight the advantages one would get by going from imperative to object-oriented, functional, lazy evaluation, promise-based, event emitters, and finally reactive approach. The short examples are in JavaScript - the most widely used functional language today.

    Created Apr 9th, 2015 2,892 3

  • Run digest cycle in web worker

    An experiment in offloading the Angular dirty checking and model update step to a separate browser thread. ng-conf 2015, Salt Lake City, Utah. Video at http://youtu.be/lceLw8ROUP8?list=PLOETEcp3DkCoNnlhE-7fovYvqwVPrRiY7

    Created Mar 3rd, 2015 4,861 1

  • Journey from procedural to reactive JavaScript with stops - MountainWest JS 2015

    How do we convince / train developers used to imperative programming style to switch to functional or even reactive programming? I show the same example implemented in multiple styles to highlight the advantages one would get by going from imperative to object-oriented, functional, lazy evaluation, promise-based, event emitters, and finally reactive approach. The short examples are in JavaScript - the most widely used functional language today.

    Created Mar 1st, 2015 2,685 2

  • Journey from procedural to reactive JavaScript with stops

    How do we convince / train developers used to imperative programming style to switch to functional or even reactive programming? I show the same example implemented in multiple styles to highlight the advantages one would get by going from imperative to object-oriented, functional, lazy evaluation, promise-based, event emitters, and finally reactive approach. The short examples are in JavaScript - the most widely used functional language today.

    Created Feb 15th, 2015 2,086 0

  • Performance Profiling Using Chrome Code Snippets

    Chrome DevTools code snippets became my favorite tool when investigating performance bottlenecks in web applications. A JavaScript fragment can be stored as a named snippet in the "Sources" DevTools panel and executed in the current page's context, just as if it were a code executed in the browser's console.

    Created Feb 3rd, 2015 2,569 3

  • AngularJs Performance

    profiling and improving AngularJs application performance using code snippets, working in batches, offloading work, on-demand computation, memory preallocation and smart DOM updates.

    Created Dec 16th, 2014 3,216 3