Jsonnet vs Mustache: What are the differences?

Introduction:
JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and write. Jsonnet is a data-templating language that extends JSON and is used to generate JSON output. Mustache is a logic-less template syntax that can be used for any programming language.

1. **Differences in Logic**: Jsonnet allows for the introduction of logic and control structures in templates, making it more powerful in handling complex transformations and computations. Mustache, on the other hand, is designed to be logic-less and focuses on the separation of data and presentation, making it simpler and more straightforward in its approach.
2. **Inheritance and Composition**: Jsonnet supports inheritance and composition through mixins, allowing templates to inherit properties from other templates or combine multiple templates into a single one. Mustache does not natively offer support for inheritance or composition and relies on the inclusion of partials for reuse of template components.
3. **Variable Scope**: Jsonnet allows for the scoping of variables within different contexts, providing flexibility in managing variable definitions within templates. Mustache uses a simple context stack for variable lookup, limiting the scope of variables to a single level of hierarchy within the template.
4. **Conditional Rendering**: Jsonnet enables conditional rendering of template elements based on logical expressions, providing more control over the output based on specific conditions. Mustache supports basic conditional rendering through boolean values but lacks the ability for complex conditional logic.
5. **Inline Functions**: Jsonnet allows for the definition and invocation of inline functions within templates, enabling reusable code snippets and modularization of template logic. Mustache does not support the creation of inline functions within templates, requiring the implementation of logic outside the template itself.
6. **Extensibility**: Jsonnet offers more extensibility and customization options through its programming-like features, making it suitable for advanced template transformations and data processing tasks. Mustache, being logic-less, is limited in extensibility and is more focused on the separation of concerns between data and presentation.

In Summary, Jsonnet provides a more feature-rich and flexible approach to data templating with support for logic, inheritance, variable scoping, conditional rendering, inline functions, and extensive customization options, while Mustache adopts a simpler, logic-less approach with a focus on data and presentation separation.