Non-local variable: Difference between revisions

Revision as of 14:43, 10 November 2021

Revision as of 00:06, 12 May 2022

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{{Short description|Programming variable which is not defined in the local scope}}

In [[programming language theory]], a '''non-local variable''' is a variable that is not defined in the local [[Scope (computer science)|scope]]. While the term can refer to [[global variablesvariable]]s, it is primarily used in the context of [[nested function|nested]] and [[anonymous function]]s where some variables can be in neither the [[local scope|local]] nor the [[global scope]].

In [[Lua (programming language)|Lua]] they are called the ''upvalues'' of the function.<ref>''[http://www.lua.org/pil/contents.html Programming in Lua (first edition)],'' "[http://www.lua.org/pil/27.3.3.html 27.3.3 – Upvalues]"</ref>