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Hard skills of a Ext JS Developer

Ext JS is a powerful JavaScript framework used for building interactive web applications. Ext JS developers possess a range of hard skills that allow them to effectively utilize this framework to create robust, scalable, and feature-rich applications.

Junior

• Ext JS Fundamentals: Proficiency in the core concepts and components of Ext JS, including layouts, components, and data models.
• JavaScript: Strong understanding of JavaScript and its essential features, such as variables, functions, data types, and control flow.
• HTML and CSS: Knowledge of HTML and CSS to create well-structured and visually appealing user interfaces.
• Debugging and Troubleshooting: Ability to debug Ext JS applications and identify and resolve common issues.
• Version Control: Familiarity with version control systems like Git to manage source code efficiently.

Middle

• Ext JS Components: Proficiency in working with advanced Ext JS components like grids, forms, charts, and trees.
• Object-Oriented Programming (OOP): Strong grasp of OOP principles and the ability to apply them effectively in Ext JS development.
• Ext JS Architecture: Understanding of the Ext JS application architecture and the ability to design scalable and maintainable applications.
• RESTful APIs: Experience in integrating Ext JS applications with RESTful APIs to fetch and manipulate data.
• Unit Testing: Knowledge of unit testing frameworks like Jasmine or Sencha Test to ensure code quality and maintainability.
• Performance Optimization: Ability to optimize Ext JS applications for improved performance and responsiveness.
• Browser Compatibility: Understanding of cross-browser compatibility issues and techniques to address them.

Senior

• MVVM Architecture: Proficiency in implementing the Model-View-ViewModel (MVVM) architectural pattern in Ext JS applications.
• Advanced JavaScript Concepts: In-depth knowledge of advanced JavaScript concepts like closures, prototypes, and async programming.
• Data Binding: Expertise in utilizing Ext JS data binding capabilities to establish dynamic relationships between components and data.
• Code Review and Refactoring: Experience in conducting code reviews and refactoring Ext JS code to improve code quality and maintainability.
• Performance Profiling: Ability to use profiling tools to identify performance bottlenecks and optimize Ext JS applications accordingly.
• Internationalization (i18n): Understanding of internationalization concepts and the ability to implement multi-language support in Ext JS applications.
• Responsive Design: Knowledge of responsive design principles and techniques to create applications that adapt to different screen sizes.
• Security Best Practices: Familiarity with security best practices and the ability to implement secure coding practices in Ext JS applications.

Expert/Team Lead

• Ext JS Customization: Expertise in customizing and extending Ext JS components and framework features to meet specific project requirements.
• Performance Tuning: Advanced skills in optimizing Ext JS applications for maximum performance and scalability.
• Code Architecture: Ability to design and implement a scalable and modular code architecture for large-scale Ext JS applications.
• Project Management: Experience in leading and managing Ext JS development projects, including task allocation, progress monitoring, and team coordination.
• Code Documentation: Proficiency in documenting Ext JS code to facilitate understanding, maintenance, and collaboration among team members.
• Code Quality Assurance: Expertise in implementing coding standards, automated testing, and code quality tools to ensure high-quality Ext JS code.
• Training and Mentoring: Ability to mentor and train junior developers in Ext JS best practices and provide guidance on complex development tasks.
• Continuous Integration and Deployment: Experience in setting up and managing CI/CD pipelines for Ext JS applications to ensure efficient development and deployment processes.
• Performance Optimization Strategies: In-depth knowledge of advanced performance optimization strategies, such as lazy loading, virtual scrolling, and data caching.
• Advanced UI/UX Concepts: Understanding of advanced UI/UX concepts and the ability to create visually appealing and intuitive user interfaces using Ext JS.
• Browser Performance and Compatibility: Expertise in addressing browser-specific performance and compatibility issues to ensure optimal user experience across different platforms.

Cases when Ext JS does not work

1. Unsupported Browsers: Ext JS is a powerful JavaScript framework that provides a rich set of UI components and data management capabilities. However, it is important to note that Ext JS may not work as expected in older or unsupported browsers. While Ext JS supports all major modern browsers such as Chrome, Firefox, Safari, and Edge, it may encounter compatibility issues in outdated versions or niche browsers. It is always recommended to check the official Ext JS documentation for the list of supported browsers and their respective versions.
2. JavaScript Disabled: Ext JS heavily relies on JavaScript to create dynamic and interactive web applications. If a user visits a website built with Ext JS and has JavaScript disabled in their browser, the Ext JS functionality will not work. Although most modern browsers have JavaScript enabled by default, there might still be some users who intentionally disable it or have browser extensions that block JavaScript execution. It is essential to consider graceful degradation techniques or provide alternative functionality for users without JavaScript support.
3. Incompatible Ext JS Versions: Ext JS is a framework that evolves over time, with new features and bug fixes being introduced in each release. If you are developing or using an application that depends on a specific version of Ext JS, it is crucial to ensure that the required version is compatible with the other components and libraries used in the project. Using incompatible versions can lead to conflicts, errors, or unexpected behaviors that can hinder the proper functioning of Ext JS.
4. Server-Side Issues: While Ext JS primarily operates on the client-side, it often interacts with server-side technologies to handle data retrieval, storage, and processing. If there are issues with the server-side implementation or the APIs used to communicate with the server, it can affect the overall functionality of the Ext JS application. Problems such as incorrect data format, server errors, or slow response times can lead to unexpected behavior or failure of Ext JS components.
5. Customization Challenges: Ext JS provides extensive customization options, allowing developers to tailor the framework to their specific needs. However, complex customizations or modifications to the core Ext JS codebase can sometimes introduce compatibility issues or conflicts with future updates. It is essential to carefully consider the impact of customization and follow best practices to minimize the risk of breaking functionality during upgrades or when integrating with third-party libraries.

Please note that the above cases do not imply that Ext JS is inherently flawed or unreliable. Ext JS is a widely adopted and robust framework that powers numerous successful web applications. However, it is crucial to be aware of potential challenges and considerations to ensure a smooth and optimal experience when using Ext JS in your projects.

What are top Ext JS instruments and tools?

• Sencha Architect: Sencha Architect is a visual application builder for Ext JS that allows developers to create user interfaces without writing code. It provides a drag-and-drop interface for designing and building complex UIs and offers a wide range of pre-built components and layouts. Sencha Architect has been a popular tool among Ext JS developers since its release in 2011.
• Ext Designer: Ext Designer, previously known as Sencha Designer, is a visual layout and design tool for Ext JS applications. It allows developers to visually create and edit Ext JS interfaces, manage project assets, and generate code. Ext Designer was first released in 2009 and has been widely used by developers for rapid prototyping and UI design.
• ExtBuild: ExtBuild is a command-line tool that automates the build process for Ext JS applications. It helps to optimize and package the application’s source code, CSS, and resources, reducing the size and improving performance. ExtBuild is a versatile tool that allows developers to customize the build process according to their requirements.
• ExtGen: ExtGen is a Yeoman generator for quickly scaffolding Ext JS applications. It sets up a project structure, configures build tools, and provides a development server for running and testing Ext JS applications. ExtGen simplifies the initial setup process and provides a streamlined workflow for building Ext JS applications.
• Sencha Test: Sencha Test is a comprehensive testing framework for Ext JS applications. It enables developers to create and run automated tests, perform unit testing, and generate test reports. Sencha Test helps to ensure the quality and stability of Ext JS applications by identifying and fixing issues early in the development cycle.
• Themer: Themer is a powerful tool for customizing the look and feel of Ext JS applications. It provides an intuitive interface for creating themes, modifying existing themes, and previewing the changes in real-time. Themer simplifies the process of branding and styling Ext JS applications, allowing developers to create visually appealing user interfaces.
• ExtWebComponents: ExtWebComponents is a set of UI components based on web standards, including custom elements and shadow DOM. It allows developers to seamlessly integrate Ext JS components into any web application or framework, making it easier to leverage the rich functionality and features of Ext JS in modern web development.
• Sencha Cmd: Sencha Cmd is a command-line tool for managing Ext JS projects. It provides a wide range of features, including project generation, code scaffolding, build optimization, and deployment. Sencha Cmd has been widely adopted by Ext JS developers for its ability to streamline development workflows and automate repetitive tasks.
• Sencha Inspector: Sencha Inspector is a browser extension that provides a set of powerful debugging and profiling tools for Ext JS applications. It allows developers to inspect the application’s component hierarchy, monitor performance, and troubleshoot issues. Sencha Inspector is an essential tool for optimizing and fine-tuning Ext JS applications.
• Sencha Fiddle: Sencha Fiddle is an online code editor and collaboration platform for Ext JS developers. It provides a sandbox environment for experimenting with Ext JS code, sharing code snippets, and collaborating with other developers. Sencha Fiddle is a valuable resource for learning, prototyping, and troubleshooting Ext JS applications.

How and where is Ext JS used?

Soft skills of a Ext JS Developer

Soft skills are essential for Ext JS developers as they enhance their ability to effectively collaborate, communicate, and adapt in a team-based development environment. Here are the soft skills required for Ext JS developers at different levels:

Junior

• Problem Solving: Ability to analyze and solve coding challenges efficiently.
• Attention to Detail: Paying close attention to code quality and ensuring accuracy.
• Time Management: Efficiently managing tasks and meeting project deadlines.
• Proactive Learning: Willingness to learn new technologies and stay updated.
• Team Collaboration: Ability to work well within a team and contribute effectively.

Middle

• Critical Thinking: Analyzing complex problems and finding optimal solutions.
• Adaptability: Embracing change and quickly adapting to new technologies.
• Communication: Effectively conveying ideas and collaborating with team members.
• Leadership Potential: Demonstrating potential to take on leadership roles.
• Conflict Resolution: Resolving conflicts and fostering a positive work environment.
• Quality Assurance: Ensuring code quality through testing and debugging.
• Client Management: Managing client expectations and effectively communicating project progress.

Senior

• Mentoring: Guiding and mentoring junior developers to enhance their skills.
• Strategic Thinking: Developing long-term project strategies and roadmaps.
• Project Management: Leading project teams and ensuring successful project delivery.
• Innovation: Identifying and implementing innovative solutions for complex challenges.
• Collaboration: Building strong relationships with stakeholders and cross-functional teams.
• Decision Making: Making informed decisions based on project requirements and constraints.
• Technical Documentation: Creating comprehensive technical documentation.
• Conflict Management: Resolving conflicts and maintaining a positive team dynamic.

Expert/Team Lead

• Team Leadership: Providing guidance and direction to the development team.
• Strategic Planning: Developing and executing strategic plans for the team.
• Resource Management: Efficiently allocating resources to maximize productivity.
• Client Relationship Management: Building and maintaining strong client relationships.
• Business Acumen: Understanding business goals and aligning them with technical solutions.
• Influence and Negotiation: Influencing stakeholders and negotiating project requirements.
• Agile Methodologies: Applying agile principles to enhance project delivery.
• Risk Management: Identifying and mitigating risks throughout the project lifecycle.
• Continuous Improvement: Driving continuous improvement initiatives within the team.
• Technical Expertise: Demonstrating deep knowledge and expertise in Ext JS development.
• Strategic Decision Making: Making critical decisions to drive project success.

Pros & cons of Ext JS

9 Pros of Ext JS

• Highly comprehensive and feature-rich framework for building complex web applications.
• Provides a rich set of UI components and widgets that are highly customizable and offer a consistent look and feel.
• Offers excellent support for data management, including powerful data binding and data manipulation capabilities.
• Ext JS has a robust architecture that promotes code reusability and modular development, making it easier to maintain and extend applications.
• Supports responsive design, allowing applications to adapt to different devices and screen sizes.
• Offers extensive documentation, tutorials, and a strong community support, making it easier for developers to learn and troubleshoot.
• Provides excellent cross-browser compatibility, ensuring consistent performance and functionality across different web browsers.
• Offers built-in support for localization and internationalization, making it easier to develop applications for a global audience.
• Backed by Sencha, a reputable company with a long history in the web development industry, providing stability and ongoing support.

9 Cons of Ext JS

• Ext JS has a steep learning curve, requiring developers to invest time and effort in understanding its complex architecture and concepts.
• The framework has a relatively high licensing cost, making it less accessible for small or budget-constrained projects.
• Ext JS can be resource-intensive, potentially impacting the performance of applications, especially on low-powered devices.
• While Ext JS offers a wide range of UI components, the customization options can sometimes be overwhelming and lead to more complex code.
• The framework’s reliance on JavaScript inheritance can result in longer code files and make it harder to debug and refactor.
• Ext JS has a larger file size compared to some other frameworks, which can impact page load times, especially on slower internet connections.
• Some developers feel that Ext JS has a steeper learning curve compared to other JavaScript frameworks, such as React or Angular.
• The framework’s extensive feature set and options can sometimes lead to decision paralysis or over-engineering of applications.
• While Ext JS has a strong community support, the community size may be smaller compared to other popular JavaScript frameworks.

TOP 10 Ext JS Related Technologies

• JavaScript

  JavaScript is the most fundamental language for Ext JS software development. It is a versatile, high-level programming language that enables the creation of interactive and dynamic web applications.

• HTML5

  HTML5 is the latest version of Hypertext Markup Language and is crucial for Ext JS development. It provides the structure and elements necessary for creating modern and responsive web applications.

• CSS3

  CSS3 is a styling language used to enhance the visual appearance of web applications built with Ext JS. It allows developers to create attractive and customized user interfaces.

• Sencha Ext JS

  Sencha Ext JS is a comprehensive JavaScript framework specifically designed for building feature-rich web applications. It provides a wide range of UI components, data management tools, and architectural patterns.

• Sencha Architect

  Sencha Architect is a visual development tool that simplifies the process of creating Ext JS applications. It offers a drag-and-drop interface for designing UI layouts and generating code.

• RESTful APIs

  RESTful APIs (Application Programming Interfaces) are essential for integrating Ext JS applications with backend systems. They allow data exchange and communication between the client-side Ext JS application and server-side services.

• Node.js

  Node.js is a server-side JavaScript runtime environment that enables running JavaScript code outside of a web browser. It can be used with Ext JS to build scalable and efficient server applications.

Let’s consider Difference between Junior, Middle, Senior, Expert/Team Lead developer roles.

TOP 15 Tech facts and history of creation and versions about Ext JS Development

• Ext JS is a JavaScript framework for building web applications. It follows the MVC (Model-View-Controller) architecture, allowing for clean separation of concerns.
• Ext JS was created in the year 2007 by Jack Slocum, a software engineer and entrepreneur.
• The initial version of Ext JS was called “Ext 1.0” and it introduced a powerful set of UI components that were not available in other JavaScript frameworks at the time.
• Ext JS 2.0, released in 2008, introduced the concept of “Ext Grid”, which provided a flexible and feature-rich data grid component for displaying tabular data.
• In 2010, Sencha (formerly known as Ext JS) released Ext JS 3.0, which focused on improving performance and stability, as well as introducing new components like the “Ext TreePanel” for hierarchical data representation.
• Ext JS 4.0, released in 2011, brought a complete overhaul of the framework with a focus on modernizing the codebase and improving performance. It introduced the concept of “Ext Class System” for better code organization and reusability.
• Ext JS 5.0, released in 2014, introduced a new architecture called “MVVM” (Model-View-ViewModel), which provided a more structured approach to building complex applications.
• Ext JS 6.0, released in 2015, introduced a new theme called “Material” which followed Google’s Material Design guidelines, giving applications a modern and visually appealing look.
• Ext JS 7.0, released in 2019, focused on improving developer productivity with new features like “Ext Modern Toolkit” for building responsive and touch-friendly applications.
• Ext JS has been widely adopted by enterprises and developers worldwide, with companies like IBM, NASA, and Adobe using it to build their web applications.
• Ext JS provides a rich set of UI components such as grids, charts, forms, and menus, making it easy to create complex and interactive user interfaces.
• Ext JS has a large and active community, with regular updates and releases, ensuring that the framework stays up-to-date with the latest web technologies.
• Ext JS is known for its excellent documentation and comprehensive guides, making it easy for developers to learn and use the framework.
• Ext JS offers powerful data binding capabilities, allowing developers to easily synchronize data between the UI and the underlying data model.
• Ext JS has a robust testing framework called “Sencha Test” which enables developers to write automated tests for their Ext JS applications.

TOP 15 Facts about Ext JS

• Ext JS is a powerful JavaScript framework that is widely used for building data-intensive, cross-platform web applications.
• It was developed by Sencha, a software company specializing in web application development tools.
• Ext JS provides a rich set of UI components, such as grids, forms, trees, and charts, which are highly customizable and easy to use.
• With its robust architecture, Ext JS allows developers to create complex applications with ease, providing features like data binding, MVC (Model-View-Controller) pattern, and rich data management capabilities.
• Ext JS follows a component-based approach, allowing developers to reuse and combine components to build powerful user interfaces.
• It offers extensive support for data manipulation and data visualization, making it ideal for creating dynamic and interactive dashboards.
• Ext JS employs a responsive design, ensuring that applications built with it are optimized for different devices and screen sizes.
• It provides comprehensive documentation and a large community of developers, which makes it easy to find support and resources.
• Ext JS integrates seamlessly with other frameworks and libraries, such as AngularJS and React, enabling developers to leverage the strengths of multiple technologies.
• It offers built-in support for internationalization, allowing developers to create applications that can be easily translated into different languages.
• Ext JS follows industry best practices for security, including protection against common vulnerabilities like XSS (Cross-Site Scripting) and CSRF (Cross-Site Request Forgery).
• It has a robust testing framework, which helps developers ensure the quality and stability of their applications through automated testing.
• Ext JS has a strong focus on performance optimization, providing features like lazy loading, virtual scrolling, and intelligent data caching.
• It offers seamless integration with backend technologies, supporting various data formats and protocols, such as JSON, XML, and RESTful APIs.
• Ext JS provides a comprehensive set of tools for development, including a powerful IDE (Integrated Development Environment) called Sencha Architect, which simplifies the design and development process.