Ekern: Created page with "TOC {| |width="50%"| '''Action:''' |width="50%"| Tests if a macro variable is defined. '''Syntax:'''..."

2022-08-18T19:41:14Z

Created page with "__TOC__ {| |width="50%"| '''Action:''' |width="50%"| Tests if a macro variable is defined. '''Syntax:'''..."

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Tests if a [[working_with_macro_variables.html|macro variable]] is defined. 

'''Syntax:'''

&&exists(variableName) 

where ''variableName'' is the macro variable whose existence is being checked.

If the named variable exists, &&exists returns 1; otherwise, it returns 0. 

A variable is deemed to "not exist" in these cases: 

*It has not been defined since the Debugger Client was last started or restarted. 

*It has been defined, but it was removed with the unset command. 

'''Examples:'''

The following statement returns 0: 

echo &&exists("&neverSet") 

The echo statement below returns 1: 

set &i = 666
echo &&exists("&i") 

The echo statement below returns 0: 

unset &i
echo &&exists("&i") 
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| '''Introduced:'''
| Build 60
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&&exists - Revision history

Ekern: Created page with "__TOC__ {| |width="50%"| '''Action:''' |width="50%"| Tests if a macro variable is defined. '''Syntax:'''..."

Ekern: Created page with "TOC {| |width="50%"| '''Action:''' |width="50%"| Tests if a macro variable is defined. '''Syntax:'''..."