Groovy 3.0 YamlSlurper

yaml-to-list.groovy

import groovy.yaml.YamlSlurper

def yamlSlurper = new YamlSlurper()
def yaml = yamlSlurper.parseText('''\
- 100
- 50
- 1
''')

assert yaml instanceof List
assert yaml == [100, 50, 1]

yaml-to-map.groovy

import groovy.yaml.YamlSlurper

def yamlSlurper = new YamlSlurper()
def yaml = yamlSlurper.parseText('''\
age: 25
name: "Mikasa"
languages:
  - "English"
  - "Japanese"
''')

assert yaml instanceof Map
assert yaml.name == 'Mikasa'
assert yaml.languages == ['English', 'Japanese']

yaml-to-object.groovy

import groovy.yaml.YamlSlurper

def yamlSlurper = new YamlSlurper()
def yaml = yamlSlurper.parseText('''\
name: amazon/aws-xray-daemon
tags:
  - 3.2.0
  - 3.1.0
''')

class DockerImage { String name; List tags; }
def image = new DockerImage(yaml)

assert image.name == 'amazon/aws-xray-daemon'
assert image.tags == ['3.2.0', '3.1.0']