Closure

In computer science, a closure is a semantic concept referring to a function paired with an environment. When called, the function can reference elements of the environment required for the function’s evaluation. Typically, a closure occurs when one function appears entirely within the body of another, and the inner function refers to local variables of the outer function. At runtime, when the outer function executes, a closure is formed, consisting of the inner function’s code and references to any variables of the outer function required by the closure. The exact nature of a closure's environment and the relation between this environment and its associated function will vary from language to language and depend upon both the features of the language and how closures were implemented.

The distinguishing feature of closures is the ability to associate an "intermediate" set of data with a function where the data set is distinct from both the global data of the program and data local to the function itself. As a consequence, closures can be used to hide state, implement higher-order functions and defer evaluation.

The concept of closures was developed in the 60’s and was first fully implemented as a language feature in the programming language Scheme. Since then, some form of closures is a feature common to many languages.

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