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Event-driven programming is the dominant paradigm used in graphical user interfaces applications and network servers. In an event-driven application, there is generally an event loop that listens for events and then triggers a callback function when one of those events is detected.
Feb 2, 2024 · Event-driven programming lies at the core of Node.js, defining its asynchronous nature and facilitating efficient handling of I/O operations. This article provides an in-depth explanation of event-driven programming in Node.js, its key concepts, and practical applications.
Event-driven programming enables decoupled components to communicate by producing, detecting, consuming, and reacting to events. An event-driven program’s flow is determined by events such as user actions, system changes, sensor outputs, or messages from other programs.
- What Is Event-Driven Programming?
- What Makes Event-Driven Programming Special?
- Examples
- Handling Events
- Conclusion
Event-driven programming, or event-oriented programming, is a paradigm where entities (objects, services, and so on) communicate indirectly by sending messages to one another through an intermediary. The messages are typically stored in a queue before being handled by the consumers. Unlike in using direct calls, event-driven programming completely ...
Let's explore some of the properties of the event-driven programming paradigm and see what makes it cool—and what makes it tricky. Our focus will be on push-based systems.
The following examples of event-driven programming are from a blocks puzzle game I developed with my sons. You can find the source code for the project at https://github.com/the-gigi/blocktser. Blocktser is a simple game that runs in a browser. It is implemented in TypeScript, the Canvas API, and the phaser.ioframework. In Blocktser, you drag shape...
The subscription event handlers delegate the actual logic to the onDragging, onDragStart, and onDragEnd methods of the Shape class. The Shape's onStartDrag method ignores drag start events on other objects. Then, it performs some logic to scale the shape and update it. (Dragging the shape changes its size.) Finally, it calls onDragStart on a list o...
Event-based programming is an incredibly useful paradigm, with use cases ranging from UI in a single-process system to communication between services in large-scale distributed systems. The loosely coupled nature of event-based programming provides many benefits, though it may require a shift in how you think about inter-object communication. With ...
- Gigi Sayfan
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Nov 13, 2018 · Event-driven programming is a computer programming paradigm where control flow of the program is determined by the occurrence of events. These events are monitored by code known as an event listener.
Event Driven Programming is a programming approach that enables software to respond to events originating from external sources, such as user input or system changes. It allows the creation of dynamic applications where the flow of control is determined by the sequence of events, rather than a predetermined order of execution.
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Mar 18, 2024 · Event-driven programming promotes loose coupling between different components of the application, making it easier to manage and develop code. Instead of a large block of code executed line by line, we have small blocks that are executed when a specific event occurs.