declarative try

Jenkinsfile

@@ -1,15 +1,15 @@
-#!/usr/bin/env groovy
+pipeline {
+    agent any
 
-properties(
-    [
-        string(name: 'Name', defaultValue: 'denes'),
-        string(name: 'Age', defaultValue: '34')
-    ]
-)
+    parameters {
+        booleanParam(defaultValue: true, description: 'blabla?', name: 'userFlag')
+    }
 
-node('master') {
-	stage('Print params') {
-		sh "echo "${params.Name}"
-		sh "echo "${params.Age}"
+    stages {
+        stage("foo") {
+            steps {
+                echo "flag: ${params.userFlag}"
+            }
+        }
     }
 }