Function IsFunction() Foundation
Checks if a symbolic name indicates the name of a function or procedure
IsFunction( <cFuncName>, [<nType>] ) --> lExist
IsFunction() returns .T. (true) if a function or procedure with the name <cFuncName> exists, otherwise it returns .F. (false).
The function IsFunction() checks if a function or procedure exists at runtime. IsFunction() differs from the function Type() by searching for a symbolic name in the symbol table, while Type() returns the data type of a macro-compiled character expression.
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