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The term closure is often used as a synonym for anonymous function, though strictly, an anonymous function is a function literal without a name, while a closure is an instance of a function, a value, whose non-local variables have been bound either to values or to storage locations (depending on the language; see the lexical environment section below).
The ECMA-262 specification defines scope as: a lexical environment in which a Function object is executed in client-side web scripts; [9] akin to how scope is defined in lambda calculus. [10] As a part of the "MVC" architecture, the scope forms the "Model", and all variables defined in the scope can be accessed by the "View" as well as the ...
In lexical scope (or lexical scoping; also called static scope or static scoping), if a variable name's scope is a certain function, then its scope is the program text of the function definition: within that text, the variable name exists, and is bound to the variable's value, but outside that text, the variable name does not exist.
An immediately invoked function expression (or IIFE, pronounced "iffy", IPA /ˈɪf.i/) is a programming language idiom which produces a lexical scope using function scoping. It was popular in JavaScript [1] as a method of supporting modular programming before the introduction of more standardized solutions such as CommonJS and ES modules. [2]
Lexical tokenization is the conversion of a raw text into (semantically or syntactically) meaningful lexical tokens, belonging to categories defined by a "lexer" program, such as identifiers, operators, grouping symbols, and data types. The resulting tokens are then passed on to some other form of processing.
It maps a variable (represented with a de Bruijn index) into the value in the current environment at this index. It maps a syntactic function into a semantic function. (Applying a semantic function to an argument reduces to evaluating the body of the corresponding syntactic function in its lexical environment, extended with the argument.)
This is an accepted version of this page This is the latest accepted revision, reviewed on 18 February 2025. High-level programming language Not to be confused with Java (programming language), Javanese script, or ECMAScript. JavaScript Screenshot of JavaScript source code Paradigm Multi-paradigm: event-driven, functional, imperative, procedural, object-oriented Designed by Brendan Eich of ...
A data structure that captures a function along with its lexical environment. Enabling functions to be first-class citizens, carrying state along with them. Monad: A design pattern used to encapsulate computation with sequential processing, side effects, or other operational contexts.