isdef

Test whether a named variable exists.

bool isdef <string:VarName>

True if the variable named by VarName exists, and false otherwise.

// create a variable called "i" and then test whether it exists using isdef and echo
int i

if <zs:isdef "i">
  echo "true"
else
  echo "false"
endif

… the output of which is written to the event log by echo as:

true

None.

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