Defined

Determines whether a variable, array, or timer with this name exists. The variable, array or timer must not be enclosed with ${}.

Forms

bool Defined[Name]

Returns true if the given variable name is defined.

Usage

/if (${Defined[varname]}) {
    /echo ${varname}
}

This TLO is added by MacroQuest.

Republished and possibly modified from https://docs.macroquest.org/reference/top-level-objects/tlo-defined/