Evacurry

Evacurry is a functional programming technique and a higher-order function that combines the concepts of currying and partial application to create a more flexible and reusable function composition. The term itself is a portmanteau of "evacuation" and "curry," reflecting its role in extracting and applying function arguments incrementally.

Currying is the process of transforming a function that takes multiple arguments into a sequence of functions that each take a single argument. For example, a function `f(a, b, c)` can be curried into `f(a)(b)(c)`. Partial application, on the other hand, involves fixing some arguments of a function and generating a new function with fewer arguments. Evacurry builds on these ideas by allowing the selective extraction of arguments from a function, enabling more dynamic and adaptable function usage.

The primary use of evacurry is to simplify the process of creating specialized functions from more general ones. By extracting arguments in a controlled manner, developers can generate tailored functions without rewriting the original logic. This is particularly useful in scenarios where functions need to be reused with different configurations, such as in configuration-driven applications or modular programming.

Evacurry is often implemented using closures and function composition, allowing developers to chain partial applications to build complex behaviors incrementally. While not a built-in feature in most programming languages, it can be easily implemented using lambda calculus or functional programming libraries. For instance, in JavaScript, evacurry can be approximated using arrow functions and the spread operator to extract and apply arguments selectively.

The technique is widely used in functional programming paradigms to enhance code modularity, readability, and reusability. By leveraging evacurry, developers can avoid repetitive code and create more maintainable applications by abstracting common configurations into reusable functions.