Jenkins jobDSL: simple questions and answers

During getting with Jenkins jobDSL I faced some questions.

It took time to find right solutions so to save your time I post some tips in question-answer manner.

I hope it will help you in your difficult automation path.

 

 

How to use Jenkins parameters in groovy code?
Sample code:

...

// define parameters as
parameters {
    stringParam('VERSION', '10.2.0.0', '')
    stringParam('BRANCH', 'master', '')
}

...

// use it like this

branch('remotes/origin/pr/\$BRANCH/merge')