Non-local variable: Difference between revisions

Revision as of 22:32, 3 November 2011

Revision as of 23:28, 3 November 2011

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

== Example ==

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</source>

In thisthe next example the variable <code>c</code> is non-local in the anonymous function <code>\x -> x + c</code>:

<source lang=haskell>

outer = let c = 1 in map (\x -> x + c) [1, 2, 3, 4, 5]