Jenkins Choice parameter Passing to a pipeline Job

Question

Currently I have a pipeline job which has different paramters where one of this parameters is a Choice parameter. Here is the config.xml output of that job parameter:

<

Answer 1

As documented at https://www.jenkins.io/doc/book/pipeline/syntax/#parameters in September 2020, the documented syntax to use a choice parameter in a pipeline is:

pipeline {
    agent any
    parameters {
        choice(
            name: 'CHOICE',
            choices: ['one', 'two', 'three'],
            description: ''
        )
    }
    stages {
        stage('Example') {
            steps {
                echo "Choice: ${params.CHOICE}"
                sh "echo Choice: ${params.CHOICE}"
                sh 'echo Choice: $CHOICE'
            }
        }
    }
}

In testing, the choice defaults to the first parameter in the list, I have not looked into if this has potential to be otherwise.

All three versions of the task perform the same. Note the specific quotes used.