Functional reactive programming
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Functional reactive programming combines functional programming and reactive programming. Functional programming avoids mutable state and side effects through referential transparency and reusable functions. Reactive programming builds reactive systems through asynchronous data streams and treating everything as a stream. Observables are the core component, representing a stream of data over time, and operators allow querying, transforming, and combining observables. RxJS is a popular library for implementing functional reactive programming.
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5 spy software
Mspy is a popular spying software due to its simplicity, state-of-the-art apps, and regular updates. It allows monitoring of call logs, recordings, GPS location, emails, internet use, instant messages, and more.
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Exam quistions
1. The document contains a sample exam for a software requirements specification course. It includes 10 multiple choice questions and 10 true/false questions testing concepts from the textbook.
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This document contains questions and answers about software requirements and specifications. It covers topics like misunderstanding requirements leading to inaccurate planning, gold plating, the role of the business analyst in gathering requirements, requirements engineering processes, skills needed by business analysts, defining the product vision, making assumptions, and using workshops to encourage stakeholder collaboration. The questions test understanding of these concepts from the textbook chapters referenced in each question.
Choices
The document contains multiple choice and true/false questions about software requirements and business analysis. Some key points addressed include:
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Atm
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The document discusses software requirements from the perspective of customers and stakeholders. It defines key terms like business requirements, functional requirements, and non-functional requirements. It emphasizes the importance of frequent engagement with customers to understand their needs and manage expectations. This ensures the developed software closely matches what customers require rather than making assumptions. The document also discusses identifying all relevant stakeholders to obtain a full picture of requirements, such as direct users, indirect users, and others affected by the system.
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Functional reactive programming
- 1. Functional Reactive Programming BY: AHMED KAMEL TAHA
- 2. Functional Programming Evaluation of mathematical functions ■ Avoid mutable state ■ Referential transparency ■ Avoid side-effects ■ Reusable functions over reusable object ■ Function composition over object composition
- 3. Reactive Programming A programming paradigm that helps you to build ‘Reactive Systems’. E.g.: Google Spreadsheet • In a reactive world, we can't just wait for a function result, a network call, or a database query to return. • Every moment we wait for something, we lose the opportunity to do other things in parallel. • Reactive programming can be done in several ways ◦ • Akka Actors ◦ • Reactive Extensions (Rx) – reactive + functional
- 4. Why Reactive Programming? Why another programming paradigm? • Things are different now! • Conventional software applications won’t be able to fulfill the modern enterprise needs. • Its time to rethink about our software architecture patterns and programming techniques.
- 5. What it actually means to be Reactive? “Readily responsive to a stimulus” - merriam-webster Reactive Systems : •responds in a timely manner •stays responsive in the face of failure •stays responsive under varying workload •rely on asynchronous message-passing
- 6. Functional Programming map filter mergeAll reduce zip
- 7. Map
- 8. Filter
- 9. Map & Filter
- 10. MergeAll
- 11. FlatMap
- 12. Reduce
- 13. Zip
- 14. Reactive Programming Asynchronous data streams Everything is a stream click events user inputs data from a server
- 15. Observables o Stream of data over time o Hot vs Cold Observables o Asynchronous o Lazy o queryable, bufferable, pausable… o more than 120 operations
- 20. Cold Observables • Hot observables are pushing even when we are not subscribed to them (e.g., UI events).
- 21. Hot Observables • Cold observables start pushing only when we subscribe. They start over if we subscribe again.
- 22. Autocomplete
- 23. Autocomplete
- 24. RxJS Supported ◦ IE6+ ◦ Chrome 4+ ◦ FireFox 1+ ◦ Node.js v0.4+ Size (minified & gzipped): ◦ all - 23,1k ◦ lite - 13,5k ◦ compat - 12,5k ◦ ES5 core - 12k
- 25. Framework Bridges AngularJS ReactJS jQuery ExtJS NodeJS Backbone
- 26. Alternatives to RxJS BaconJS Kefir (Elm)
- 27. Conclusion There is a learning curve Great abstraction for async & events Improves Readability Reusability Scalability Both on the front- and backend