Templatingjärjestelmä

Templatingjärjestelmä, often translated as templating system, is a software mechanism that separates presentation logic from business logic. It allows developers to create dynamic content by merging static templates with dynamic data. These systems are commonly used in web development to generate HTML pages, but can also be applied to other forms of output like emails, reports, or configuration files.

The core idea of a templatingjärjestelmä is to provide a predefined structure, the template, which contains placeholders or special syntax for inserting variable data. When a request is made, the templating engine takes the template and the relevant data, processes them, and outputs the final, rendered content. This separation makes it easier to manage and update the design of an application without altering its underlying functionality.

Popular templating systems vary in their syntax and features. Some use simple variable substitution, while others offer more advanced logic like loops, conditionals, and inheritance. Examples include Jinja for Python, Handlebars for JavaScript, and Twig for PHP. The choice of templatingjärjestelmä often depends on the programming language and the specific requirements of the project. By abstracting the presentation layer, templating systems promote code reusability, improve maintainability, and facilitate collaboration between designers and developers.