In computer programming, a nested function (or nested procedure/subroutine) is a function which is lexically (textually) encapsulated within another function. It can only be called by the enclosing function or by functions directly or indirectly nested within the same enclosing function. In other words, the scope of the nested function is limited by the enclosing function. The nesting is theoretically possible to any level of depth, although only a few levels are normally used in practice.
Read more about Nested Function: An Example, Purpose, Languages, Implementation
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