Rx.js allows for asynchronous programming using Observables that provide a stream of multiple values over time. The document discusses how Observables can be created from events, combined using operators like map, filter, and flatMap, and subscribed to in order to handle the stream of values. A drag and drop example is provided that creates an Observable stream of mouse drag events by combining mouse down, mouse move, and mouse up event streams. This allows treating the sequence of mouse events as a collection that can be transformed before handling the drag behavior.
This document discusses RxJS marble testing. It provides an overview of Observables, Schedulers, and the TestScheduler. The TestScheduler allows testing asynchronous code by virtualizing time, mocking Observables with marble diagrams, and asserting expected emissions. Examples demonstrate creating cold Observables, time, and testing an Epic that uses delay with the redux-observable-test-helper. Marble testing makes asynchronous code more testable.
The document discusses how to use RxJS (Reactive Extensions library for JavaScript) to treat events like arrays by leveraging Observable types and operators. It explains key differences between Observables and Promises/Arrays, how Observables are lazy and cancelable unlike Promises. Various RxJS operators like map, filter, interval and fromEvent are demonstrated for transforming and composing Observable streams. The document aims to illustrate how RxJS enables treating events as collections that can be processed asynchronously over time.
서버 개발자가 바라 본 Functional Reactive Programming with RxJava - SpringCamp2015NAVER / MusicPlatform
youtube : https://youtu.be/E_Bgv9upahI
비동기 이벤트 기반의 라이브러리로만 생각 했던 RxJava가 지금 이 시대 프로그래머에게 닥쳐 올 커다란 메시지라는 사실을 알게 된 지금. 현장에서 직접 느낀 RxJava의 본질인 Function Reactive Programming(FRP)에 대해 ���리가 잘 아는 Java 이야기로 풀어 보고 ReactiveX(RxJava) 개발을 위한 서버 환경에 대한 이해와 SpringFramework, Netty에서의 RxJava를 어떻게 이용 하고 개발 했는지 공유 하고자 합니다.
The document contains 6 programming tasks involving object-oriented concepts like classes, operators overloading, constructors etc. in C++. The tasks include modifying existing classes to add new functionality like operator overloading for arithmetic, relational and logical operators. New classes are also designed from scratch implementing various features like constructors, member functions and operator overloading. Main functions are written to test the classes.
This document provides an overview of various JavaScript concepts and techniques, including:
- Prototypal inheritance allows objects in JavaScript to inherit properties from other objects. Functions can act as objects and have a prototype property for inheritance.
- Asynchronous code execution in JavaScript is event-driven. Callbacks are assigned as event handlers to execute code when an event occurs.
- Scope and closures - variables are scoped to functions. Functions create closures where they have access to variables declared in their parent functions.
- Optimization techniques like event delegation and requestAnimationFrame can improve performance of event handlers and animations.
Shift Remote FRONTEND: Reactivity in Vue.JS 3 - Marko Boskovic (Barrage)Shift Conference
In previous versions of Vue we needed abstracted patterns like Higher Order Components (HOC), mixins or props to implement reactivity. The new functional API gives us the ability to encapsulate and reuse logic across multiple components without those abstracted patterns.
RxJS Operators - Real World Use Cases (FULL VERSION)Tracy Lee
This document provides an overview and explanation of various RxJS operators for working with Observables, including:
- The map, filter, and scan operators for transforming streams of data. Map applies a function to each value, filter filters values, and scan applies a reducer function over time.
- Flattening operators like switchMap, concatMap, mergeMap, and exhaustMap for mapping Observables to other Observables.
- Error handling operators like catchError, retry, and retryWhen for catching and handling errors.
- Additional explanation of use cases and common mistakes for each operator discussed. The document is intended to explain these essential operators for real world reactive programming use.
RxJS101 - What you need to know to get started with RxJS tomorrowViliam Elischer
This document provides an overview of RxJS, a library for composing asynchronous and event-based programs using observable sequences. It discusses key RxJS concepts like Observables, Observers, Operators, and how to create and use Observables. It also provides learning resources and highlights improvements in RxJS 5 like compliance with the Observable specification and better performance.
The document discusses the benefits of using RxJS observables over promises and events for managing asynchronous and reactive code in Angular applications. It explains key concepts like observers, subscriptions, operators, cold vs hot observables, and using RxJS with services and components. Example code is provided for creating observable data services to share data between components, composing asynchronous logic with operators, and best practices for managing subscriptions and preventing memory leaks. Overall, the document promotes a reactive programming style with RxJS for building maintainable and testable Angular applications.
Concurrent applications with free monads and stmAlexander Granin
The document discusses using Free monads and STM (Software Transactional Memory) for building concurrent applications in Haskell. It provides examples of applications like a labyrinth game and meteor shower simulation that are built using Free monads, STM transactions, processes and signals to coordinate concurrent operations. The document also discusses building a blockchain application using a similar approach with nodes, services, state and declarative protocols.
Add Some Fun to Your Functional Programming With RXJSRyan Anklam
This document discusses using RxJS (Reactive Extensions for JavaScript) to add interactivity and animation to an autocomplete search widget. Key events are turned into observables and used to make AJAX requests and trigger animations. Observables are merged, concatenated, and flattened to coordinate the asynchronous events and animations over time. Functional programming concepts like map, filter, and reduce are used to transform and combine the observable streams.
Solid principles in practice the clean architecture - Droidcon ItalyFabio Collini
The Clean Architecture has been formalized by Robert C. Martin in 2012, it's quite new even if it's based on the SOLID principles (presented for the first time in early 2000). The biggest benefit that we get using this architecture is the code testability, indeed it separates the application code from the code connected to external factor (that usually is more difficult to test).
In this talk we'll see a practical example of how to apply the SOLID principle, in particular, the dependency inversion.
SOLID principles in practice: the Clean ArchitectureFabio Collini
The Clean Architecture has been formalized by Robert C. Martin in 2012, it's quite new even if it's based on the SOLID principles (presented for the first time in early 2000). The biggest benefit that we get using this architecture is the code testability, indeed it separates the application code from the code connected to external factor (that usually is more difficult to test).
In this talk we'll see a practical example of how to apply the SOLID principle, in particular, the dependency inversion.
Тема №2 Расширяем сознание реактивным подходом. RxJava и Android
Спикер — Владимир Артеменко — android developer Компания Rooky Pro
Уровень аудитории — Теория есть, начальный опы�� применения
Цель доклада – Обучение
Think Async: Asynchronous Patterns in NodeJSAdam L Barrett
JavaScript is single threaded, so understanding the async patterns available in the language is critical to creating maintainable NodeJS applications with good performance. In order to master “thinking in async”, we’ll explore the async patterns available in node and JavaScript including standard callbacks, promises, thunks/tasks, the new async/await, the upcoming asynchronous iteration features, streams, CSP and ES Observables.
The document discusses virtual machines and JavaScript engines. It provides a brief history of virtual machines from the 1970s to today. It then explains how virtual machines work, including the key components of a parser, intermediate representation, interpreter, garbage collection, and optimization techniques. It discusses different approaches to interpretation like switch statements, direct threading, and inline threading. It also covers compiler optimizations and just-in-time compilation that further improve performance.
This document provides an overview of key concepts for working with D3, including:
- D3 uses standard web technologies like HTML, SVG, and CSS rather than introducing new representations. Learning D3 largely means learning web standards.
- Visualization with D3 requires mapping data to visual elements using scales. Scales are functions that map from data values to visual values like pixel positions.
- Selections in D3 correspond to elements in the DOM. Data joins allow binding data to selections to drive attribute updates. The enter, update, exit pattern is used to handle new, existing and removed data.
- Common scale types include linear, log, quantize and quantile for quantitative data, and
Lightning Talk on Software Transactional Memory in Scala. The Actors Pattern has gotten a lot of attention in the Scala ecosphere, but STM of often a good first solution for solving concurrency problems. It's odd that it hasn't had as much attention in the Scala world, so this talk aims to show how easy it is to use, and compare it to typical lock-based synchronization by showing how easy it is to make errors with lock-based synchronization
The document introduces Elm, a functional programming language that compiles to JavaScript. It has a focus on simplicity, robustness, and helping developers avoid bugs. Some key points about Elm include its functional, immutable, and statically typed nature; built-in support for functional reactive programming; use for building rich user interfaces; and emphasis on easy refactoring and adding new features. The document also discusses Elm's syntax, type system, record handling, approach to avoiding runtime exceptions, architecture for user interface apps, and ecosystem of tools.
— Табуретка Нормана и как на ней усидеть в огромной продуктовой компании UX команде
— «Хочу» не равно «Нада»: валидация гипотез и интерпритация данных
— Проектирование для B2B / B2C / C2C / B2G
— Симбиоз нескольких методологий проектирования
Modern javascript localization with c-3po and the good old gettextAlexander Mostovenko
This document summarizes a presentation about localization in modern JavaScript applications using GNU gettext. Some key points:
- GNU gettext is recommended over ICU due to better tooling and compatibility with existing backend formats.
- C-3po is an open source library that improves on gettext by allowing extraction and resolution of translations directly from JavaScript code using tagged template literals.
- It implements an extraction/merge/resolve workflow that allows developers and translators to work independently and precompiles translations for faster loading.
The SlideShare 101 is a quick start guide if you want to walk through the main features that the platform offers. This will keep getting updated as new features are launched.
The SlideShare 101 replaces the earlier "SlideShare Quick Tour".
WebCamp:Front-end Developers Day. Александр Мостовенко "Rx.js - делаем асинхр...GeeksLab Odessa
04.07.2015 WebCamp:Front-end Developers Day
Александр Мостовенко (Python developer at Prom.ua)
"Rx.js - делаем асинхронное программирование проще"
В данном докладе будет рассмотрено преимущество FRP подхода к построению javascript приложений на примере библиотеки Rx.js. Узнаем как Rx.js позволяет избавиться от callback hell и превращает сложные вещи в простые.
Подробнее:
http://geekslab.co,
http://webcamp.in.ua/
https://www.facebook.com/GeeksLab.co , https://www.facebook.com/OdessaInnovationWeek
https://www.youtube.com/user/GeeksLabVideo
Rxjs provides a paradigm for dealing with asynchronous operations in a way that resembles synchronous code. It uses Observables to represent asynchronous data streams over time that can be composed using operators. This allows handling of events, asynchronous code, and other reactive sources in a declarative way. Key points are:
- Observables represent asynchronous data streams that can be subscribed to.
- Operators allow manipulating and transforming streams through methods like map, filter, switchMap.
- Schedulers allow controlling virtual time for testing asynchronous behavior.
- Promises represent single values while Observables represent continuous streams, making Observables more powerful for reactive programming.
- Cascading asynchronous calls can be modeled elegantly using switch
1) Rxjs provides a paradigm for dealing with asynchronous operations in a synchronous way using observables. Observables allow representing push-based data streams and provide operators to compose and transform these streams.
2) Operators like map, filter, and switchMap allow manipulating observable streams and their values in various ways. Common patterns include cascading asynchronous calls, parallelizing multiple requests, and retrying or error handling of streams.
3) Schedulers allow bending time and virtual clocks, enabling testing asynchronous code by controlling when asynchronous operations complete. Marble testing uses descriptive patterns to visually test observable streams and operator behavior.
This document provides an overview of Rxjs (Reactive Extensions for JavaScript). It begins by explaining why Rxjs is useful for dealing with asynchronous code in a synchronous way and provides one paradigm for asynchronous operations. It then discusses the history of callbacks and promises for asynchronous code. The bulk of the document explains key concepts in Rxjs including Observables, Operators, error handling, testing with Schedulers, and compares Promises to Rxjs. It provides examples of many common Rxjs operators and patterns.
The document provides an introduction to RxJS (Reactive Extensions for JavaScript), which is a reactive programming library for asynchronous operations. It discusses key RxJS concepts like Observables, operators, and functional reactive programming. It also provides examples of using RxJS to handle events asynchronously and processing streams of data.
The document discusses reactive programming and frameworks. It introduces reactive programming as a way to think about asynchronous and event-based programming that is fundamental to cloud, web and mobile applications. It shows how asynchronous and event-based computations can be viewed as push-based collections by dualizing enumerable collections to observable collections. This allows applying LINQ-style queries to asynchronous programming. Examples are provided for moving a ball with keyboard input and dragging the mouse to draw, implemented imperatively and declaratively with observables.
The document discusses reactive programming and reactive systems. It defines the three parts of the reactive spectrum as reactive (software showing responses to stimuli), reactive systems (frameworks like Akka and Vert.x), and reactive programming (programming models using streams/flows like RxJava). It discusses key aspects of reactive systems like asynchronous programming, back pressure in streams to handle varying workloads, and using reactive types like Singles, Maybes and Completables. The document advocates for building responsive distributed systems using these reactive principles and introduces Vert.x as a toolkit for building such systems.
This document provides an overview of ReactiveX (Rx), which is an API for asynchronous programming using observable streams. It discusses key Rx concepts like Observables, which represent sets of values over time that can be subscribed to; Operators, which allow transforming, combining, and manipulating observable streams; and Subjects, which act as both Observable and Observer and are useful for multicasting streams. The document provides examples of using Rx in autocomplete applications and discusses Schedulers, which define the execution context for asynchronous operations in Rx. Overall, the document serves as a high-level introduction to the reactive programming paradigm and Rx library.
Funtional Reactive Programming with Examples in Scala + GWTVasil Remeniuk
This document provides an overview of functional reactive programming (FRP) with examples using Scala and GWT (Google Web Toolkit). It discusses how FRP can be used to build user interfaces that synchronize state changes automatically in response to events. Key concepts explained include EventStreams, Signals, and how they can be transformed and combined. Examples show how FRP can be used to track mouse position, build stock tickers that update dynamically, and manage collections of values that change over time. The document argues that FRP provides advantages over the traditional observer pattern for building interactive user interfaces.
Asynchronous web apps with the Play Framework 2.0Oscar Renalias
This document discusses Play's asynchronous capabilities for building scalable and responsive web applications. It begins by explaining the traditional blocking request processing model and Play's asynchronous non-blocking model. It then covers asynchronous requests using Futures and Promises in Play. Examples are provided for making actions asynchronous using asynchronous responses. The document also discusses reactive IO in Play using Enumerators and Iteratees for non-blocking streaming of data. Real world use cases for asynchronous programming include asynchronous web services, streaming files and data, and websockets.
RxJS is a library for reactive programming that allows composing asynchronous and event-based programs using observable sequences. It provides the Observable type for pushing multiple values to observers over time asynchronously. Operators allow transforming and combining observables. Key types include Observable, Observer, Subject, BehaviorSubject, and ReplaySubject. Subjects can multicast values to multiple observers. Overall, RxJS is useful for handling asynchronous events as collections in a declarative way.
This document introduces Reactive Extensions (RxJS) for JavaScript, which allows programming with asynchronous data streams. It discusses key RxJS concepts like Observables that emit event streams and Observers that subscribe to those streams. It provides examples of creating Observables from events, making Ajax requests, retrying failures, combining streams, and using various operators to transform and filter streams. The goal is to help developers learn how to use RxJS to compose asynchronous actions and events in a functional, reactive style.
The document discusses Reactive programming concepts using RxJava. It defines key RxJava terms like Observable and Observer. An Observable is the source of events, while an Observer handles incoming events. It also covers how to create Observables from sources like arrays, intervals, and network calls. Operators like filter, map, take, and defaultIfEmpty are demonstrated for transforming Observables.
Workshop slides from the Alt.Net Seattle 2011 workshop. Presented by Wes Dyer and Ryan Riley. Get the slides and the workshop code at http://rxworkshop.codeplex.com/
The document discusses reactive programming and how it can be used on Android. It explains that reactive programming uses observable sequences and asynchronous data flows. It introduces RxJava as a library for reactive programming that uses Observables to compose flows of asynchronous data. It provides examples of how RxJava can be used on Android to perform background tasks, handle errors and activity lifecycles, load images asynchronously, and create and transform Observables.
Asynchronous programming done right - Node.jsPiotr Pelczar
This document discusses asynchronous programming and avoiding race conditions. It covers how asynchronous actions allow the main program flow to continue processing without blocking on I/O. It also discusses how asynchronous programming works with callbacks and promises rather than sequential execution. It provides examples of using libraries like Async to control asynchronous flows and common pitfalls to avoid like double callbacks and unexpected asynchronous behavior.
BitLocker Data Recovery | BLR Tools Data Recovery SolutionsAlina Tait
BLR Tools provides an advanced BitLocker Data Recovery Tool specifically engineered to recover lost or inaccessible data from BitLocker-encrypted drives. Whether you're dealing with accidental deletion, encryption key problems, or system crashes, our cutting-edge software guarantees a secure and efficient recovery process. Rely on BLR Tools for dependable BitLocker data recovery and effortlessly restore access to your essential files.
AI is revolutionizing DevOps by advancing algorithmic optimizations in pipelines, elevating efficiency levels, and introducing predictive functionalities. This article examines how AI is reshaping continuous integration, deployment strategies, monitoring practices, and incident management within DevOps ecosystems, ultimately amplifying efficiency and dependability.
Test Polarity: Detecting Positive and Negative Tests (FSE 2024)andrehoraa
Positive tests (aka, happy path tests) cover the expected behavior of the program, while negative tests (aka, unhappy path tests) check the unexpected behavior. Ideally, test suites should have both positive and negative tests to better protect against regressions. In practice, unfortunately, we cannot easily identify whether a test is positive or negative. A better understanding of whether a test suite is more positive or negative is fundamental to assessing the overall test suite capability in testing expected and unexpected behaviors. In this paper, we propose test polarity, an automated approach to detect positive and negative tests. Our approach runs/monitors the test suite and collects runtime data about the application execution to classify the test methods as positive or negative. In a first evaluation, test polarity correctly classified 117 tests as as positive or negative. Finally, we provide a preliminary empirical study to analyze the test polarity of 2,054 test methods from 12 real-world test suites of the Python Standard Library. We find that most of the analyzed test methods are negative (88%) and a minority is positive (12%). However, there is a large variation per project: while some libraries have an equivalent number of positive and negative tests, others have mostly negative ones.
SAP implementation steps PDF - Zyple SoftwareZyple Software
Unlock the full potential of your SAP system with our comprehensive SAP Implementation Steps PDF guide! This detailed document is your go-to resource for navigating the complexities of SAP implementation from start to finish. Whether you’re a project manager, an IT specialist, or a business leader, this PDF provides step-by-step instructions, best practices, and expert insights to ensure a successful SAP deployment.
What You’ll Find in This Guide
1. Project Preparation: Discover how to define your objectives clearly, assemble a skilled project team, and develop a robust project plan. Learn how to identify your business needs, set measurable goals, and create a timeline that aligns with your organization’s strategic vision.
2. Business Blueprint: Understand how to analyze current business processes, define specific requirements, and design a comprehensive Business Blueprint. This section helps you document existing workflows, identify gaps, and map out how SAP solutions will address these gaps to meet your business needs.
3. Realization: Get detailed instructions on configuring the SAP system, migrating data from legacy systems, and conducting thorough testing. This part of the guide covers system setup, customization, data extraction, transformation, loading (ETL), and various testing phases to ensure the system functions as expected.
4. Deployment: Learn the critical steps for a successful Go-Live. This includes preparing for the transition, executing the Go-Live plan, and providing initial support. The guide explains how to manage data validation, user training, and system readiness to ensure a smooth launch.
5. Post-Go-Live Support: Discover how to monitor system performance, address any issues that arise, and conduct a post-implementation review. This section helps you evaluate the success of the SAP implementation, gather feedback, and plan for future improvements.
Generative AI The Key to Smarter, Faster IT Development.pdfayushiqss
Discover how generative AI is transforming IT development in this blog. Learn how using AI software development, artificial intelligence tools, and generative AI tools can lead to smarter, faster, and more efficient software creation. Explore real-world applications and see how these technologies are driving innovation and cutting costs in IT development.
Unified customer experience management tools integrate various customer interaction channels, data, and analytics into a single platform. They streamline customer service, enhance personalization, and provide insights for improving customer satisfaction and loyalty across all touchpoints.
How to Secure Your Kubernetes Software Supply Chain at ScaleAnchore
Achieving comprehensive security visibility in Kubernetes environments is essential for maintaining robust and compliant cloud-native applications. In this exclusive webinar, Anchore and Spectro Cloud team up to showcase how to enhance your Kubernetes security posture with SBOM (Software Bill of Materials) management and vulnerability scanning.
Join Cornelia Davis, VP of Product, Spectro Cloud and Alan Pope, Director of Developer Relations, Anchore to learn how to elevate your Kubernetes security visibility and protect your cloud-native applications effectively.
—Discover how Anchore can be integrated with Spectro Cloud Palette to take SBOM scanning to the next level, delivering fully automated software compliance
—Gain valuable insights into best practices for securing your Kubernetes workloads, ensuring compliance, and improving your DevSecOps processes.
AI - Your Startup Sidekick (Leveraging AI to Bootstrap a Lean Startup).pdfDaniel Zivkovic
Ready to take your #startup to the next level? Pankaj Upreti, Lagna360 founder, reveals how a #solopreneur can leverage #AI across their entire business. Learn to use AI as your ultimate sidekick in bootstrapping a #LeanStartup, from coding to marketing. Don't miss these game-changing insights for your entrepreneurial journey!
#ServerlessTO meetup recording is at https://youtu.be/J17OZ6_2jyk
Don't forget to like, comment, and subscribe for more insightful talks and tutorials from #Serverless #Toronto: https://www.meetup.com/serverless-toronto/events/
Waze vs. Google Maps vs. Apple Maps, Who Else.pdfBen Ramedani
Let’s face it, getting lost isn’t really part of the adventure anymore (unless you’re into that sort of thing!). Nowadays, a good navigation app is like your trusty compass, guiding you through busy city streets and winding country roads. But with so many options out there—from big names like Waze, Google Maps, and Apple Maps to some lesser-known contenders—choosing the right one can feel a bit overwhelming.
Think about it: you're about to head out on a road trip, and the last thing you want is to end up in the middle of nowhere because you took a wrong turn. Or maybe you're just trying to navigate your daily commute without hitting every single red light. That's where a solid navigation app comes in handy.
Google Maps is like the old reliable friend who knows every shortcut and scenic route. It's packed with features, from real-time traffic updates to detailed directions, making it a top choice for many. But then there's Waze, the social butterfly of navigation apps. It's all about community, with drivers sharing real-time updates on traffic, accidents, and even speed traps. It’s perfect if you want to feel like you’re part of a huge driving club, all working together to get everyone to their destination faster.
And let’s not forget Apple Maps, which has come a long way since its rocky start. If you're deep into the Apple ecosystem, it's a seamless choice, integrating smoothly with all your devices and offering some pretty neat features like Flyover for 3D city views.
But wait, there are also some underdog apps worth considering! Have you heard of MapQuest? It's still around and offers some great features, especially for planning long trips with multiple stops. Then there's HERE WeGo, which is fantastic for offline navigation—a real lifesaver if you're heading somewhere with spotty cell service.
So, whether you're planning a cross-country adventure or just trying to find the quickest route to work, we’ll help you sift through these options. We’ll dive into what makes each app unique, their pros and cons, and ultimately, guide you to the perfect navigation app for your needs. Buckle up and get ready for a smooth ride!
Laravel has quickly become one of the leading PHP frameworks. Its elegant syntax, powerful features, and strong community backing make it a top choice for developers. This article delves into what makes Laravel development stand out and why it is considered the best PHP framework for modern web applications.
Unlocking the Future of Artificial IntelligencedorinIonescu
Unlock the Future: Dive into AI Today! Videnda AI specializes in developing advanced artificial intelligence solutions, including visual dictionaries and language learning tools that leverage immersive virtual travel experiences. Stay Ahead of the Curve: Master AI Now! Our AI technology integrates machine learning and neural networks to enhance education and business applications. AI: The Next Frontier. Are You Ready to Explore? With a focus on real-time AI solutions and deep learning models, Videnda AI provides innovative tools for multilingual communication and immersive learning.
In this course, you'll find a series of engaging videos packed with vibrant animations that break down complex AI concepts into digestible pieces. Our curriculum covers AI models such as Convolutional Neural Networks (CNN), Multi-Layer Perceptrons (MLP), Generative Adversarial Networks (GAN), and Transformers, providing a solid understanding of these models and their real-world applications. We also offer hands-on experience with Generative AI tools like ChatGPT and Midjourney, and Python programming tutorials to help you implement AI algorithms and build your own AI applications.
We are proud participants in the Nvidia Inception Program, driving AI innovation across various industries. By the end of our course, you'll have a strong understanding of AI principles, enhanced Python programming skills, and practical experience with state-of-the-art Generative AI tools. Whether you're looking to kickstart a career in AI or simply curious about this revolutionary technology, Videnda AI is your partner in mastering the future of artificial intelligence.
Contractor PMS Software is intended to make the work process of a group dealing with a similar Software simpler. It is proper for new companies, enormous prepared ones, and, surprisingly, various groups that should team up to execute a task. The product empowers you to dole out and reassign occupations, helpfully track cutoff times to guarantee they are met, and, obviously, control the whole interaction from an centralised management interface.
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A Step-by-Step Guide to Selecting the Right Automated Software Testing Tools.pdfkalichargn70th171
Software testing is highly essential in the software development lifecycle. Selecting the appropriate testing tool is pivotal for effective test automation and project success. As technology advances, the demands of the software market escalate, pushing industry players to deliver high-quality products swiftly through agile methodologies.
Empowering Businesses with Intelligent Software Solutions - GrawlixAarisha Shaikh
Explore Grawlix's comprehensive suite of intelligent software solutions designed to drive transformative growth and scalability for businesses. This presentation covers our expertise in bespoke software development, digital marketing, web design, cloud solutions, cybersecurity, AI/ML, and IT consulting. Discover how Grawlix's customized solutions enhance productivity, streamline processes, and enable data-driven decision-making. Learn about our key projects, technologies, and the dedicated team who ensures exceptional client satisfaction through innovation and excellence.
Fix Production Bugs Quickly - The Power of Structured Logging in Ruby on Rail...John Gallagher
Rails apps can be a black box. Have you ever tried to fix a bug where you just can’t understand what’s going on? This talk will give you practical steps to improve the observability of your Rails app, taking the time to understand and fix defects from hours or days to minutes. Rails 8 will bring an exciting new feature: built-in structured logging. This talk will delve into the transformative impact of structured logging on fixing bugs and saving engineers time. Structured logging, as a cornerstone of observability, offers a powerful way to handle logs compared to traditional text-based logs. This session will guide you through the nuances of structured logging in Rails, demonstrating how it can be used to gain better insights into your application’s behavior. This talk will be a practical, technical deep dive into how to make structured logging work with an existing Rails app.
I talk about the Steps to Observable Software - a practical five step process for improving the observability of your Rails app.
2. About me
Mostovenko Alexander
Python developer at
Writing mostly in python and coffeescript.
Love FP stuff.
Traveling, snowboarding, cycling.
https://twitter.com/MostovenkoA
https://github.com/AlexMost
3. Why Rx.js and not another FRP lib?
● Implemented in a lot of languages
(.NET, Java, Ruby, Python, Clojure, Scala,
Haskell, Objective-C).
● Has a huge amount of docs and examples.
● Why not?
29. Callback vs Black hole
some_async_func(function(err, result) {
// ... looks like we are in trap
another_wonderful_func(function(err, result){
// ... you are in trap
});
});
35. Why we should look at Observable?
1. Promise represents only single value.
2. How to cancel?
3. Lazy execution.
4. We can work with Observable as easy as with
promise.
38. Observable
var source = Rx.Observable.create((observer) =>
// some async operation
observer.onNext(data)
// or ..
observer.onError(data)
// or ..
observer.onCompleted(data)
);
source.subscribe(
(data) => {}
(err) => {}
)
39. Observlable vs promise example
var source = Rx.Observable.create((observer) => {
setTimeout(() => {
console.log("observable timeout hit");
observer.onNext(25);
}, 500);
console.log('observable started')});
source.subscribe(x => console.log(`observable value ${x}`));
Observable
> observable started
> observable timeout hit
> observable value 25
40. Observlable vs promise example
var promise = new Promise((resolve) => {
setTimeout(() => {
console.log("promise timeout hit");
resolve(25);
}, 500);
console.log("promise started");});
promise.then(x => console.log(`promise value ${x}`));
Promise
> promise started
> promise timeout hit
> promise value 25
44. Asynchronous programming landscape
multiple
values
single
value
sync async
a = f(x) a = f(x).then(...)
collection = [1, 2, 3]
a = collection
.filter((v) => v > 2)
move = Rx.Observable.fromEvent(document, 'mousemove')
my_moves = move
.filter((ev) => ev.clientX > 100)
my_moves.subscribe(...)
Promise
Array
value
Observable
45. How to create Observable
● Observable.create
● Observable.fromEvent
● Observable.fromNodeCallback
● Observable.fromArray
● Observable.fromPromise
46. Drag & Drop example
What if i told you ….
That mouse move event is an array and you
can map, filter over it?
47. var dragTarget = document.getElementById('dragTarget');
// Get the three major events collections
var mouseup = Rx.DOM.fromEvent(dragTarget, 'mouseup');
var mousemove = Rx.DOM.fromEvent(document, 'mousemove');
var mousedown = Rx.DOM.fromEvent(dragTarget, 'mousedown');
var mousedrag = mousedown.flatMap(({offsetX, offsetY}) => {
return mousemove
.map(({clientX: x, clientY: y}) => {
return {left: x - offsetX, top: y - offsetY}})
.takeUntil(mouseup)
});
var subscription = mousedrag.subscribe((pos) => {
dragTarget.style.top = pos.top + 'px';
dragTarget.style.left = pos.left + 'px';
});
48. var dragTarget = document.getElementById('dragTarget');
// Get the three major events collections
var mouseup = Rx.DOM.fromEvent(dragTarget, 'mouseup');
var mousemove = Rx.DOM.fromEvent(document, 'mousemove');
var mousedown = Rx.DOM.fromEvent(dragTarget, 'mousedown');
var mousedrag = mousedown.flatMap(({offsetX, offsetY}) => {
return mousemove
.map(({clientX: x, clientY: y}) => {
return {left: x - offsetX, top: y - offsetY}})
.takeUntil(mouseup)
});
var subscription = mousedrag.subscribe((pos) => {
dragTarget.style.top = pos.top + 'px';
dragTarget.style.left = pos.left + 'px';
});
Create observable collections
from DOM events
49. var dragTarget = document.getElementById('dragTarget');
// Get the three major events collections
var mouseup = Rx.DOM.fromEvent(dragTarget, 'mouseup');
var mousemove = Rx.DOM.fromEvent(document, 'mousemove');
var mousedown = Rx.DOM.fromEvent(dragTarget, 'mousedown');
var mousedrag = mousedown.flatMap(({offsetX, offsetY}) => {
return mousemove
.map(({clientX: x, clientY: y}) => {
return {left: x - offsetX, top: y - offsetY}})
.takeUntil(mouseup)
});
var subscription = mousedrag.subscribe((pos) => {
dragTarget.style.top = pos.top + 'px';
dragTarget.style.left = pos.left + 'px';
});
Using power of Rx, combine
existing event streams to produce
mouse drag event collection
50. var dragTarget = document.getElementById('dragTarget');
// Get the three major events collections
var mouseup = Rx.DOM.fromEvent(dragTarget, 'mouseup');
var mousemove = Rx.DOM.fromEvent(document, 'mousemove');
var mousedown = Rx.DOM.fromEvent(dragTarget, 'mousedown');
var mousedrag = mousedown.flatMap(({offsetX, offsetY}) => {
return mousemove
.map(({clientX: x, clientY: y}) => {
return {left: x - offsetX, top: y - offsetY}})
.takeUntil(mouseup)
});
var subscription = mousedrag.subscribe((pos) => {
dragTarget.style.top = pos.top + 'px';
dragTarget.style.left = pos.left + 'px';
});
Subscribe on mouse drag events,
updating top and left attributes
51. Observable are first class events
Can be:
- passed as a parameter
- returned from a function
- assigned to a variable
53. Some common basic operations
map
filter
reduce
zip
merge
flatMap
...
https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/core/observable.md
80. dispatchActions = (view, eventStream, store) ->
incrementClickStream = eventStream
.filter(({action}) -> action is "increment_click_count")
.do(-> store.incrementClicksCount())
Rx.Observable.merge(
incrementClickStream
# some more actions here for updating view ...
).subscribe(
-> view.setProps getViewState(store)
(err) ->
console.error? err)
RxReact (simple click count)
81. dispatchActions = (view, eventStream, store) ->
incrementClickStream = eventStream
.filter(({action}) -> action is "increment_click_count")
.do(-> store.incrementClicksCount())
Rx.Observable.merge(
incrementClickStream
# some more actions here for updating view ...
).subscribe(
-> view.setProps getViewState(store)
(err) ->
console.error? err)
RxReact (simple click count)
stream from view for increment and storage
modification
82. dispatchActions = (view, eventStream, store) ->
incrementClickStream = eventStream
.filter(({action}) -> action is "increment_click_count")
.do(-> store.incrementClicksCount())
Rx.Observable.merge(
incrementClickStream
# some more actions here for updating view ...
).subscribe(
-> view.setProps getViewState(store)
(err) ->
console.error? err)
RxReact (simple click count)
merge all streams that can modify UI
83. dispatchActions = (view, eventStream, store) ->
incrementClickStream = eventStream
.filter(({action}) -> action is "increment_click_count")
.do(-> store.incrementClicksCount())
Rx.Observable.merge(
incrementClickStream
# some more actions here for updating view ...
).subscribe(
-> view.setProps getViewState(store)
(err) ->
console.error? err)
RxReact (simple click count)
update UI, making setProps on view
component
84. RxReact (simple click count)
More complex case
1. Decrement.
2. Sync with server (per 1 second).
3. Sync only if value changed.
4. Show sync success message.
5. Hide success message after 2 seconds.
demo - http://alexmost.github.io/RxReact/hello_world2/public/index.html
code - https://github.com/AlexMost/RxReact/tree/master/hello_world2/hello_world2
90. Conclusion
● Rx is a powerful tool for writing async code
● Helps to write modular and composable code
● Solves a lot of hard testing problems
● Solves problem of error handling and resource
management