Examples of methods: calls from http://blog.cf-learn.info/cfengine-tip-001-modularize-complex-policies

methods_ex1.cf

bundle agent configfiles
{
  vars:  
      # Files to edit
      "files[sysctlconf]" string => "/etc/sysctl.conf";
      "files[sshdconfig]" string => "/etc/ssh/sshd_config";
      "files[inittab]"    string => "/etc/inittab";
      # ...

  methods:
      # Pass the name of the array, not the array itself.
      "backup"  usebundle => backup_files("configfiles.files");
      "sysctl"  usebundle => edit_sysctl;
      "sshd"    usebundle => edit_sshd;
      "inittab" usebundle => edit_inittab;
      "users"   usebundle => manage_users("configfiles.users");
}

methods_ex2.cf

bundle agent configfiles
{
  vars:  
      # Files to edit
      "files[sysctl]"     string => "/etc/sysctl.conf";
      "files[sshd]"       string => "/etc/ssh/sshd_config";
      "files[inittab]"    string => "/etc/inittab";
      # ...

      "file_id" slist => getindices("files");
      "bundle_names" slist => maplist("edit_$(this)", "file_id");

  methods:
      "backup"  usebundle => backup_files("configfiles.files");
      "$(bundle_names)"  usebundle => $(bundle_names)("configfiles.files");
      "users"   usebundle => manage_users("configfiles.users");
}