Odtnhj

I have managed to get out a json list and get a key out from the json.

I am working on how to put every version value in a list. How do I do that from a Map?

Map convertedJSONMap = new JsonSlurperClassic().parseText(data)

//If you have the nodes then fetch the first one only
if(convertedJSONMap."items")
 println "Version : " + convertedJSONMap."items"[0]."version"
 

So what I need is some kind of foreach loop that is going to throw the Map and just getting the items. version from each and put it in a list. How?

Groovy has Collection.collect(closure) that can be used to transform a list of values of one type to a list of new values. Consider the following example:

import groovy.json.JsonSlurper

def json = '''
 "items": [
 "id": "ID-001", "version": "1.23", "name": "Something",
 "id": "ID-002", "version": "1.14.0", "name": "Foo Bar",
 "id": "ID-003", "version": "2.11", "name": "Something else",
 "id": "ID-004", "version": "8.0", "name": "ABC",
 "id": "ID-005", "version": "2.32", "name": "Empty",
 "id": "ID-006", "version": "4.11.2.3", "name": "Null"
 ]
'''

def convertedJSONMap = new JsonSlurper().parseText(json)

def list = convertedJSONMap.items.collect it.version 

println list.inspect()

Output:

['1.23', '1.14.0', '2.11', '8.0', '2.32', '4.11.2.3']

Groovy also provides spread operator *. which can simplify this example to something like this:

import groovy.json.JsonSlurper

def json = '''
 "items": [
 "id": "ID-001", "version": "1.23", "name": "Something",
 "id": "ID-002", "version": "1.14.0", "name": "Foo Bar",
 "id": "ID-003", "version": "2.11", "name": "Something else",
 "id": "ID-004", "version": "8.0", "name": "ABC",
 "id": "ID-005", "version": "2.32", "name": "Empty",
 "id": "ID-006", "version": "4.11.2.3", "name": "Null"
 ]
'''

def convertedJSONMap = new JsonSlurper().parseText(json)

def list = convertedJSONMap.items*.version

println list.inspect()

Or even this (you can replace *.version with just .version):

import groovy.json.JsonSlurper

def json = '''
 "items": [
 "id": "ID-001", "version": "1.23", "name": "Something",
 "id": "ID-002", "version": "1.14.0", "name": "Foo Bar",
 "id": "ID-003", "version": "2.11", "name": "Something else",
 "id": "ID-004", "version": "8.0", "name": "ABC",
 "id": "ID-005", "version": "2.32", "name": "Empty",
 "id": "ID-006", "version": "4.11.2.3", "name": "Null"
 ]
'''

def convertedJSONMap = new JsonSlurper().parseText(json)

def list = convertedJSONMap.items.version

println list.inspect()

All examples produce the same output.