node {
    // adds job parameters within jenkinsfile
        properties([
           parameters([
               booleanParam(
               defaultValue: false,
               description: 'isFoo should be false',
               name: 'isFoo'
               ),
               booleanParam(
               defaultValue: true,
               description: 'isBar should be true',
               name: 'isBar'
             ),
           ])
         ])

    stage("Show items in queue") {
        def q = Jenkins.instance.queue
        echo "There are ${q.items.length} items in queue"
        q.items.each {
            echo "task ${it.task.name}"
            echo "${it.params}"
        }
    }
}