- Adding interactivity to web pages, such as menus, forms, and animations
- Validating user input
- Manipulating the DOM (Document Object Model) to add, remove, and modify HTML elements
- Developing web applications and mobile apps
- Creating games and other interactive multimedia content
JS is a very popular language, and it is used on over 98% of all websites. It is also one of the most in-demand skills in the tech industry.
- When you click a button on a web page and something happens, such as a menu appearing or a form being submitted.
- When you see an animation or video on a web page.
- When you enter text into a form on a web page and it validates your input.
- When you use a web application, such as Google Docs or Gmail.
Libraries vs. Frameworks
Libraries are collections of pre-written code that can be used to perform specific tasks. They are typically used to add functionality to an existing application. Libraries are typically modular, meaning that they can be used independently of each other. This makes them very flexible and reusable.
Frameworks are more comprehensive than libraries. They provide a complete structure for developing an application, including the architecture, design patterns, and best practices. Frameworks can be used to develop a wide variety of applications, from simple websites to complex enterprise systems.
Here is a table that summarizes the key differences between libraries and frameworks:
|Scope||Specific task||Complete application|
|Flexibility||Very flexible||Less flexible|
|Control||Developer has complete control||Framework controls the flow of the application|
|Learning curve||Easier to learn||More difficult to learn|
|Examples||React, jQuery||Angular, Vue.js, Django|
Which one Should you use?
The best way to decide whether to use a library or a framework is to consider the specific needs of your project. If you need to add functionality to an existing application, then a library is a good option. If you are developing a new application from scratch, then a framework can be a good option, especially if you want to use a proven architecture and best practices.
Factors to consider when choosing between a library and a framework:
- Your experience level: If you are a beginner, then a library may be a better option than a framework. Libraries are typically easier to learn and use.
- The size and complexity of your project: If you are developing a large and complex application, then a framework may be a better option than a library. Frameworks can provide you with the structure and tools you need to develop a complex application quickly and efficiently.
- Your team’s experience and preferences: If you are working on a team, then it is important to consider the experience and preferences of your team members when choosing between a library and a framework. It is also important to choose a technology that is supported by your team and that you can all agree on.
Ultimately, the best way to decide whether to use a library or a framework is to evaluate your specific needs and requirements.
JS can affect site performance in a number of ways, both positively and negatively.
Allow Google to discover all your content
Implement pagination correctly
Use proper <a href> links
Optimize your images
Use server-side rendering
Server-side rendering (SSR) is a technique that renders your JS on the server and sends the pre-rendered HTML to the browser. This makes it easier for Googlebot to crawl and index your content.
More in the video by Google Search Central:
By adhering to these strategies, your website’s search visibility and user experience can significantly improve.
Slow Page Load Times
Not specifying a character encoding can lead to text rendering issues, which can distort website content and degrade user experience.