This is an interactive PowerPoint presentation I made for my seminar at my workplace. It talks and illustrates how the JavaScript engine works when executing code. It also contains a step-by-step animation which demonstrates the usage of the JavaScript event loop.
Feel free to use and refer content. Copyrights reserved.
All you need to know about the JavaScript event loopSaša Tatar
Learn the difference between JavaScript Engine, JavaScript Runtime, what is JavaScript event loop and why we should care.
At the end the presentation goes through a couple of examples and implementations of throttle and debounce utility functions.
A presentation of what are JavaScript Promises, what problems they solve and how to use them. Dissects some Bluebird features, the most complete Promise library available for NodeJS and browser.
Callbacks, Promises, and Coroutines (oh my!): Asynchronous Programming Patter...Domenic Denicola
This talk takes a deep dive into asynchronous programming patterns and practices, with an emphasis on the promise pattern.
We go through the basics of the event loop, highlighting the drawbacks of asynchronous programming in a naive callback style. Fortunately, we can use the magic of promises to escape from callback hell with a powerful and unified interface for async APIs. Finally, we take a quick look at the possibilities for using coroutines both in current and future (ECMAScript Harmony) JavaScript.
All you need to know about the JavaScript event loopSaša Tatar
Learn the difference between JavaScript Engine, JavaScript Runtime, what is JavaScript event loop and why we should care.
At the end the presentation goes through a couple of examples and implementations of throttle and debounce utility functions.
A presentation of what are JavaScript Promises, what problems they solve and how to use them. Dissects some Bluebird features, the most complete Promise library available for NodeJS and browser.
Callbacks, Promises, and Coroutines (oh my!): Asynchronous Programming Patter...Domenic Denicola
This talk takes a deep dive into asynchronous programming patterns and practices, with an emphasis on the promise pattern.
We go through the basics of the event loop, highlighting the drawbacks of asynchronous programming in a naive callback style. Fortunately, we can use the magic of promises to escape from callback hell with a powerful and unified interface for async APIs. Finally, we take a quick look at the possibilities for using coroutines both in current and future (ECMAScript Harmony) JavaScript.
Have ever heard that JavaScript is event-oriented? And that Node.js has a mainloop? Have you ever had issues with setTimeout, setInterval, setImmediate, nextTick order? This talk should help you with understanding deeply Node.js and Web event loop phases!
Asynchronous JavaScript Programming with Callbacks & PromisesHùng Nguyễn Huy
This presentation is about JavaScript Promise. Topics covered in this session are:
1. Asynchronous processing in JavaScript
2. Callbacks and Callback hell
3. Promises arrive in JavaScript!
4. Constructing a Promise
5. Promise states
6. Promises chaining and transformation
7. Error handling
8. Promise.all() and Promise.race()
Back in 2015, Square and Google collaborated to launch gRPC, an open source RPC framework backed by protocol buffers and HTTP/2, based on real-world experiences operating microservices at scale. If you build microservices, you will be interested in gRPC.
This webcast covers:
- a technical overview of gRPC
- use cases and applicability in your stack
- a deep dive into the practicalities of operationalizing gRPC
Learn how to build RESTful API using Node JS with Express Js Framework. Database used is Mongo DB (Mongoose Library). Learn Step by step what is Node JS, Express, API and Mongo DB. Explain and sample code step to build RESTful API
We will cover whole of the web development basics comprising of HTML, CSS, JavaScript in this series.
Following are topics useful for any newbie to intermediate who is interested in learning Web Development
Have ever heard that JavaScript is event-oriented? And that Node.js has a mainloop? Have you ever had issues with setTimeout, setInterval, setImmediate, nextTick order? This talk should help you with understanding deeply Node.js and Web event loop phases!
Asynchronous JavaScript Programming with Callbacks & PromisesHùng Nguyễn Huy
This presentation is about JavaScript Promise. Topics covered in this session are:
1. Asynchronous processing in JavaScript
2. Callbacks and Callback hell
3. Promises arrive in JavaScript!
4. Constructing a Promise
5. Promise states
6. Promises chaining and transformation
7. Error handling
8. Promise.all() and Promise.race()
Back in 2015, Square and Google collaborated to launch gRPC, an open source RPC framework backed by protocol buffers and HTTP/2, based on real-world experiences operating microservices at scale. If you build microservices, you will be interested in gRPC.
This webcast covers:
- a technical overview of gRPC
- use cases and applicability in your stack
- a deep dive into the practicalities of operationalizing gRPC
Learn how to build RESTful API using Node JS with Express Js Framework. Database used is Mongo DB (Mongoose Library). Learn Step by step what is Node JS, Express, API and Mongo DB. Explain and sample code step to build RESTful API
We will cover whole of the web development basics comprising of HTML, CSS, JavaScript in this series.
Following are topics useful for any newbie to intermediate who is interested in learning Web Development
New abstractions for concurrency make writing programs easier by moving away from threads and locks, but debugging such programs becomes harder. The call-stack, an essential tool in understanding why and how control flow reached a certain point in the program, loses meaning when inspected in traditional debuggers. Futures, actors or iteratees make code easier to write and reason about, and in this talk I'll show a simple solution to make them easier to debug. The tool I present integrates well with the Eclipse plugin for Scala, and shows how a "reactive debugger" might look like.
"Leveraging the Event Loop for Blazing-Fast Applications!", Michael Di PriscoFwdays
Can the Microtask Queue help you improve your performances by 100x? It turns out it can, but how? JavaScript is single-threaded, yet it provides a really powerful Event Loop to allow non-blocking operations, so let's try to tame this beast together and get the most out of it! As I like to say: The Event Loop is the only infinite loop you'll love.
This is a talk given at Clojure Conj 2014 in Washington DC. The title was Paradigms of core.async and it was given by Julian Gamble.
The code and demos are available here: https://github.com/juliangamble/clojure-conj-2014-paradigms-of-core-async
The async/await syntax has arrived in JavaScript, Kotlin and Rust as a pattern for asynchronous programming - but the Project Loom of the JDK team chooses another way. This talk deals with the approaches of asynchronous programming in different programming languages and shows what Java and Project Loom want to do differently with their concept.
https://lukstei.com/2020-07-25-a-first-look-into-the-project-loom-in-java/
JavaScript basics
JavaScript event loop
Ajax and promises
DOM interaction
JavaScript object orientation
Web Workers
Useful Microframeworks
This presentation has been developed in the context of the Mobile Applications Development course, DISIM, University of L'Aquila (Italy), Spring 2015.
http://www.ivanomalavolta.com
This is a presentation for International Lisp Conference 2012 which was held in Kyoto, Japan.
Clack is a web application environment for Common Lisp to make your web applications be portable and reusable by abstracting HTTP into a simple API.
In this paper, I describe what are problems in web development and how Clack solves them.
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Zoom is a comprehensive platform designed to connect individuals and teams efficiently. With its user-friendly interface and powerful features, Zoom has become a go-to solution for virtual communication and collaboration. It offers a range of tools, including virtual meetings, team chat, VoIP phone systems, online whiteboards, and AI companions, to streamline workflows and enhance productivity.
Essentials of Automations: The Art of Triggers and Actions in FMESafe Software
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We’ll kick things off by showcasing the most commonly used event-based triggers, introducing you to various automation workflows like manual triggers, schedules, directory watchers, and more. Plus, see how these elements play out in real scenarios.
Whether you’re tweaking your current setup or building from the ground up, this session will arm you with the tools and insights needed to transform your FME usage into a powerhouse of productivity. Join us to discover effective strategies that simplify complex processes, enhancing your productivity and transforming your data management practices with FME. Let’s turn complexity into clarity and make your workspaces work wonders!
Transform Your Communication with Cloud-Based IVR SolutionsTheSMSPoint
Discover the power of Cloud-Based IVR Solutions to streamline communication processes. Embrace scalability and cost-efficiency while enhancing customer experiences with features like automated call routing and voice recognition. Accessible from anywhere, these solutions integrate seamlessly with existing systems, providing real-time analytics for continuous improvement. Revolutionize your communication strategy today with Cloud-Based IVR Solutions. Learn more at: https://thesmspoint.com/channel/cloud-telephony
Mobile App Development Company In Noida | Drona InfotechDrona Infotech
Looking for a reliable mobile app development company in Noida? Look no further than Drona Infotech. We specialize in creating customized apps for your business needs.
Visit Us For : https://www.dronainfotech.com/mobile-application-development/
Introducing Crescat - Event Management Software for Venues, Festivals and Eve...Crescat
Crescat is industry-trusted event management software, built by event professionals for event professionals. Founded in 2017, we have three key products tailored for the live event industry.
Crescat Event for concert promoters and event agencies. Crescat Venue for music venues, conference centers, wedding venues, concert halls and more. And Crescat Festival for festivals, conferences and complex events.
With a wide range of popular features such as event scheduling, shift management, volunteer and crew coordination, artist booking and much more, Crescat is designed for customisation and ease-of-use.
Over 125,000 events have been planned in Crescat and with hundreds of customers of all shapes and sizes, from boutique event agencies through to international concert promoters, Crescat is rigged for success. What's more, we highly value feedback from our users and we are constantly improving our software with updates, new features and improvements.
If you plan events, run a venue or produce festivals and you're looking for ways to make your life easier, then we have a solution for you. Try our software for free or schedule a no-obligation demo with one of our product specialists today at crescat.io
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AI Fusion Buddy Review: Brand New, Groundbreaking Gemini-Powered AI AppGoogle
AI Fusion Buddy Review: Brand New, Groundbreaking Gemini-Powered AI App
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https://sumonreview.com/ai-fusion-buddy-review
AI Fusion Buddy Review: Key Features
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✅Use Gemini to Build high-converting Converting Sales Video Scripts, ad copies, Trending Articles, blogs, etc.100% unique!
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✅Auto-post or schedule stunning AI content across all your accounts at once—WordPress, Facebook, LinkedIn, Blogger, and more.
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See My Other Reviews Article:
(1) AI Genie Review: https://sumonreview.com/ai-genie-review
(2) SocioWave Review: https://sumonreview.com/sociowave-review
(3) AI Partner & Profit Review: https://sumonreview.com/ai-partner-profit-review
(4) AI Ebook Suite Review: https://sumonreview.com/ai-ebook-suite-review
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This is a MUG with a twist you don't want to miss.
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The claim of launching a streaming platform in minutes might be a bit of an exaggeration, but there are services that can significantly streamline the process. Here's a breakdown:
Pros of Speedy Streaming Platform Launch Services:
No coding required: These services often use drag-and-drop interfaces or pre-built templates, eliminating the need for programming knowledge.
Faster setup: Compared to building from scratch, these platforms can get you up and running much quicker.
All-in-one solutions: Many services offer features like content management systems (CMS), video players, and monetization tools, reducing the need for multiple integrations.
Things to Consider:
Limited customization: These platforms may offer less flexibility in design and functionality compared to custom-built solutions.
Scalability: As your audience grows, you might need to upgrade to a more robust platform or encounter limitations with the "quick launch" option.
Features: Carefully evaluate which features are included and if they meet your specific needs (e.g., live streaming, subscription options).
Examples of Services for Launching Streaming Platforms:
Muvi [muvi com]
Uscreen [usencreen tv]
Alternatives to Consider:
Existing Streaming platforms: Platforms like YouTube or Twitch might be suitable for basic streaming needs, though monetization options might be limited.
Custom Development: While more time-consuming, custom development offers the most control and flexibility for your platform.
Overall, launching a streaming platform in minutes might not be entirely realistic, but these services can significantly speed up the process compared to building from scratch. Carefully consider your needs and budget when choosing the best option for you.
Graspan: A Big Data System for Big Code AnalysisAftab Hussain
We built a disk-based parallel graph system, Graspan, that uses a novel edge-pair centric computation model to compute dynamic transitive closures on very large program graphs.
We implement context-sensitive pointer/alias and dataflow analyses on Graspan. An evaluation of these analyses on large codebases such as Linux shows that their Graspan implementations scale to millions of lines of code and are much simpler than their original implementations.
These analyses were used to augment the existing checkers; these augmented checkers found 132 new NULL pointer bugs and 1308 unnecessary NULL tests in Linux 4.4.0-rc5, PostgreSQL 8.3.9, and Apache httpd 2.2.18.
- Accepted in ASPLOS ‘17, Xi’an, China.
- Featured in the tutorial, Systemized Program Analyses: A Big Data Perspective on Static Analysis Scalability, ASPLOS ‘17.
- Invited for presentation at SoCal PLS ‘16.
- Invited for poster presentation at PLDI SRC ‘16.
2. Agenda
• Before getting on to the main topic, we’ve
to re-iterate on:
• What is JavaScript?
• JS Runtime Environment
• Synchrony and Asynchrony
• Event Loop
• What is Event Loop?
• How it works?
• Why do we need it?
• Code Example Demonstration
3. What is JavaScript?
• JavaScript is a lightweight, cross-platform, and interpreted scripting language. It is used
for web development, both client-side and server-side.
• It is based on the ECMAScript Specification (ECMA-262 standard).
• The language is:
• Single Threaded (Synchronous)
• Event-driven (events are emitted and handled)
• Imperative (explicit instructions)
• Functional (creating and using functions)
4. JS Runtime Environment
• The JavaScript runtime environment provides access to built-in libraries and objects that
are available to a program so that it can interact with the outside world and make the code
work.
• The environment consists of:
• Execution Engine (Google V8)
• Web API – Browser; Low Level API – Node.js
• Callback Queue
• Event Loop
5. Synchrony and Asynchrony
Synchronous Calls:
• Code executes in the order they are called.
• The previous operation/function call should be
completed or done for the control to get transferred.
• i.e., they are blocking.
• Guess the output !
21. Blocking Call Example
• Imagine downloading a 10 MB image from Internet with JavaScript, with an internet speed
of 1 MB/sec in a browser.
• It would ideally take 10 seconds to load the image.
• For these 10 seconds, no other operations can be done including rendering.
• Once download completes, rest of the operations can be executed.
• This is called a synchronous/blocking call.
• Solution: Async calls!
22. Synchrony and Asynchrony
Asynchronous Calls:
• Code executes and the control is returned no matter
whether the operation is completed or not.
• i.e., they are non-blocking.
• But how to know that they are complete? Use
callbacks!
Output:
Hello World
I’m JavaScript
Timeout!
23. Callbacks? What are they?
• A callback is a function passed into another function as an argument, which is then
invoked inside the function to complete some kind of routine or action.
• They are usually used with asynchronous operations. eg: background operations.
• Example:
setTimeout() and setInterval() works asynchronously.
24. Background Ops?
SOUNDS GOOD… BUT HOW??
Cause JavaScript is:
• Single Threaded, which means it has only one Call
Stack!!
25. One more confusion…
If JavaScript is Single Threaded,
Then how setTimeout() / setInterval() works?
27. Timer Functions & I/O
• JavaScript – No native asynchrony
• JavaScript does not have support for Timer and I/O, they’re not part of the language
(ECMAScript specification).
• Timer functions such as:
• setTimeout()
• setInterval()
• Input/output functions such as:
• console.log()
• console.error()
• Which means they are implemented by someone else.
• Who? It’s the runtime environment (Browser (Web API) / Node.js).
29. JavaScript
Event Loop
• The event loop is a programming construct
or design pattern that waits for and
dispatches events or messages in a
program.
Source: Wikipedia
• It is by which the JavaScript language
behaves like a multi-threaded, being
single-threaded by nature.
• It is a form of concurrency achieved to
support asynchronous calls in JavaScript.
• So how it works? Let’s see…
38. Call Stack
Callback Queue
Event
Loop
Web API
Let’s take the example:
console.log(“I’m JavaScript’”)
Timer()
Duration: 0ms
Callback: anonymous()
COMPLETED
anonymous()
Executing…
Event Loop’s Job:
1. Check if call stack is empty.
2. If empty, pop the callback queue,
and push the callback function to
the call stack, else wait.
3. Execute the call stack.
39. Call Stack
Event
Loop
Web API
Let’s take the example:
anonymous()
anonymous()
Callback Queue
Executing…
Event Loop’s Job:
1. Check if call stack is empty.
2. If empty, pop the callback queue,
and push the callback function to
the call stack, else wait.
3. Execute the call stack.
40. Call Stack
Event
Loop
Web API
Let’s take the example:
anonymous()
Callback Queue
console.log(“Timeout!”)
Executing…
Event Loop’s Job:
1. Check if call stack is empty.
2. If empty, pop the callback queue,
and push the callback function to
the call stack, else wait.
3. Execute the call stack.
41. Call Stack
Event
Loop
Web API
Let’s take the example:
anonymous()
Callback Queue
Executing…
Event Loop’s Job:
1. Check if call stack is empty.
2. If empty, pop the callback queue,
and push the callback function to
the call stack, else wait.
3. Execute the call stack.
42. Call Stack
Event
Loop
Web API
Let’s take the example:
Callback Queue
Terminated
Event Loop’s Job:
1. Check if call stack is empty.
2. If empty, pop the callback queue,
and push the callback function to
the call stack, else wait.
3. Execute the call stack.
43. Synopsis of the Demo
• So event loop helps in concurrency of multiple operations. Yes it is true.
• But still JS is single-threaded and event loop has to wait for the call stack to get empty.
• Event Loop is also responsible for firing the callbacks associated with events.
• So JavaScript without it’s runtime having the event loop, and Web API, event handling or
asynchronous execution cannot be achieved.
• Call Stack and Events Demo: https://bit.ly/event-loop-demo
44. Why Asynchrony is needed?
• Asynchronous execution is needed, because Browsers!.
• Browser’s webpage rendering and JS execution engine runs on the same thread.
• So, if JS is busy executing some stuff, browser rendering is stuck until JS’s call stack gets empty.
• [Code Demo]
45. Fun Fact about Callbacks
• Callbacks need not be always asynchronous!
• Callback functions can also be synchronous.
• So which callbacks are asynchronous? Event handlers and Timers are.
• Which is not? Array.forEach()
• Custom callbacks need not be.
• For Example:
Array.forEach(callback) isn’t asynchronous.
https://bit.ly/array-foreach-demo
46. Thank You!
That’s how event handling and asynchrony works in JavaScript.
Thanks to Event Loop!