subfungsi

Subfungsi is a term used to describe a small function defined within another function or within a limited scope, intended to perform a specific subtask as part of a larger computation. In many programming languages, such constructs are referred to as nested functions or inner functions. The defining characteristic is locality: the subfungsi is not directly accessible from the outside, and it can capture variables from its enclosing environment through closures or similar mechanisms.

Common uses include breaking up complex logic, implementing helper calculations, and reducing duplication. They can improve readability and enable modular design, but excessive nesting can hinder clarity and complicate debugging. Some languages require explicit scoping rules and may limit the subfungsi’s lifetime or visibility.

In practice, subfungsi appear in various forms depending on the language. Python supports nested functions and closures; JavaScript allows inner functions via function declarations or expressions; languages without true nested functions often implement similar ideas with private helper methods or modules. When used judiciously, subfungsi help organize code, facilitate reuse of a small, well-defined piece of logic, and support clean interfaces for the enclosing function.

In mathematics or theoretical contexts, the term is less standardized but the concept is analogous: a smaller function that contributes to a larger operation, potentially defined on a restricted domain or as part of a decomposition like f(x) = g(h(x)). The exact use of “subfungsi” varies by field and language, but it generally denotes a building block that is local to a bigger computation. See also: nested function, helper function, closures, subroutine.