Using STUDIO+, I can design my own "scripting language"

local sp = require(game.ServerScriptService.StudioPlus)

local code = [[

    scope checkExistance -> function( variable )
        scope returnValue -> NULL;
        if ( variable ) continue
            returnValue = variable;
        <-
        give( returnValue ? "existant" : "non-existant" );
    <-

    output( checkExistance( false ) )

]]

sp(code).exe()