Core Function IsDeclared
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(Created page with "<pre> IsDeclared( <variable name> ) </pre> === Description === Check if a variable has been declared === Parameters === ==== Expression ==== string representing name of the ...") |
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==== Expression ==== | ==== Expression ==== | ||
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=== Return Value === | === Return Value === | ||
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Success: Returns 1 if variable has been assigned. | Success: Returns 1 if variable has been assigned. | ||
| − | Failure: Returns 0 if variable | + | Failure: Returns 0 if variable doesn't exist yet. |
=== Remarks === | === Remarks === | ||
Revision as of 20:00, 4 December 2011
IsDeclared( <variable name> )
Contents |
Description
Check if a variable has been declared
Parameters
Expression
String representing name of the variable to be checked.
Return Value
Success: Returns 1 if variable has been assigned.
Failure: Returns 0 if variable doesn't exist yet.
Remarks
Example
If (!IsDeclared("a")) MsgBox('$a is NOT declared'); // $a has never been assigned $a=1; If (IsDeclared ("a")) MsgBox('$a IS declared'); //due to previous $a=1 assignment
