Check if a variable is undefined in groovy

undefinedVariable.groovy

// checking bindings snippets
if (binding.hasVariable('superVariable')) {
// your code here
}
An easy solution to this is the following:
if (binding.variables.containsKey("bindingVar")) {
    // do something
}
Or if you’d like to get a null value for an optional binding:

def optVar = binding.variables.get("bindingVar")
if (optVar) {
    // do something
}

// Local vs global vars 


def bindingVar (varName) {
    def optVar = binding.variables.get(varName)
    if (optVar) {
        println(optVar)
        //will only run for global var
    }
    optVar
}
def localVar="localVariable"
bindingVar("localVar")
globalVar="global variable"
bindingVar("globalVar")
/