[StainlessS]

RT_Stats:- https://forum.doom9.org/showthread.p...light=RT_Stats

RT_VarExist(string)
 Given the name (string) of the variable that you want to test for existence, returns true if exists, else false.
 Eg, #a=32
    RT_Debug(string(RT_VarExist("a")))  # would output 'false' to debugview unless '#a=32' uncommented. {Defined(a) would fail with error}.
    return colorbars()

Could also simulate (for Globals) with Try/Catch in script (within a function, and return as result).

EDIT:

Function VarType(String GlobalName) {
    Try {
	g = Eval(GlobalName) # Fail here if not exist
        res=    g.IsBool   ? 1
            \ : g.IsInt    ? 2
            \ : g.IsFloat  ? 3
            \ : g.IsString ? 4
            \ : g.IsClip   ? 5
            \ : 0
    } Catch (msg) {
        res = 0 # Not Exist
    }
    return res
}

Function VarTypeName(Int TypIx) {Assert(0 <= Typix <= 5,"VarTypeName: Bad Typix") Return Select(TypIx,"NOT_EXIST","Bool","Int","Float","String","Clip")}

Global G_i = 666   # Comment Me Out

Type = VarType("G_i")

TypeName=VarTypeName(Type)

MessageClip("Global G_i Type = "+String(Type) + " : TypeName='"+TypeName+"'")

EDITED:

EDIT: RT_VarExist just returns result of an Avisynth function, would do equivalent of VarExist on local of that name, and if failed then on Global of that name.
We cant test locals in script within a separate function, you would need to inline script try/catch in-situ if required for local.

EDIT: Something like

    Try {Dummy=Eval(LocalName) LocalExist=True} Catch(msg) {LocalExist=False} # Dummy, avoid assign anything to Last