delete if key = value Groovy - groovy

Question

I have a ruby script that I need to convert to Groovy, its a simple case of removing a collection if key: value.
So in my setup I make a request to the github api
def jsonParse(def json) {
new groovy.json.JsonSlurperClassic().parseText(json)
}
def request = sh script: """curl https://api.github.com/repos/org/${repo}/releases?access_token=${env.TOKEN}""", returnStdout: true
def list = jsonParse(request)
return list
This returns output like so
[
[prerelease: 'true', author: [surname: 'surname', book: 'title'], surname: 'surname'],
[prerelease: 'false', author: [surname: 'surname', book: 'title'], surname: 'surname']
]
In Ruby i would do the following
array.delete_if { |key| key['prerelease'] == true }
How would I approach this with Groovy, if an explanation could be provided that would also be great so i can learn from it
Update
Using the approach from #Rao my list is exactly the same
def request = sh script: """curl https://api.github.com/repos/org/${repo}/releases?access_token=${env.TOKEN}""", returnStdout: true
def list = jsonParse(request)
list.removeAll(list.findAll{it.prerelease == 'true'})
return list
Raw response
[
{"prerelease": true, "author": [ {"surname": "surname", "book": "title"}, "surname": "surname"],
{"prerelease": false, "author": [ {"surname": "surname", "book": "title"}, "surname": "surname"]
]

Answer 1

e. g. with
array = array.findAll { it.prerelease != 'true' }
I guess you don't need anymore explanation?

Answer 2

The sample data is list of maps.
Need to remove the items from the list by filtering prerelease is equal to true. Hope this is string only as embedded between the quotes.
Here is the script which results filtered list.
def list = [
[prerelease: 'true', author: [surname: 'surname', book: 'title'], surname: 'surname'],
[prerelease: 'true', author: [surname: 'surname', book: 'title'], surname: 'surname'],
[prerelease: 'false', author: [surname: 'surname', book: 'title'], surname: 'surname']
]
//Remove all those elements(map) from list if matching the condition
list.removeAll(list.findAll{it.prerelease == 'true'})
//Show the updated list
println list
You can quickly try it online Demo
EDIT: based on OP comment.
Isn't this below output what you want?
EDIT2: Based on OP changed response as Json
def json = """[
{"prerelease": true, "author": [ {"surname": "surname", "book": "title"}]},
{"prerelease": false, "author": [ {"surname": "surname", "book": "title"}]}
]"""
list = new groovy.json.JsonSlurper().parseText(json)
println new groovy.json.JsonBuilder(list.findAll{ it.prerelease != true }).toPrettyString()