Kill Jenkins jobs in a folder

killfolder.groovy

import hudson.model.*
import jenkins.model.Jenkins



for (job in Jenkins.instance.items) {
  if( job.getFullName().contains('my folder') ){
    stopJobs(job)
  }
}

def stopJobs(job) {
    if (job in com.cloudbees.hudson.plugins.folder.Folder) {
      for (child in job.items) {
        stopJobs(child)
      }    
    } else if (job in org.jenkinsci.plugins.workflow.multibranch.WorkflowMultiBranchProject) {
      for (child in job.items) {
        stopJobs(child)
      }
    } else if (job in org.jenkinsci.plugins.workflow.job.WorkflowJob) {

      if (job.isBuilding()) {
        for (build in job.builds) {
        build.doKill()
        }
      }
    }
  }