jenk hasVariable (keep me)

Jenkinsfile

pipeline {
    agent none
    stages {
        stage('stage') {
            steps {
                script {
                    if (binding.hasVariable('superVariable')) {
                      echo("superVariable == 0: ")
                      echo(superVariable == 0)
                    }
                    else {
                      echo("no var")
                    }
                }
            }
        }
    }
}