Puppet users - May 2014 - Patterns for building configs using hashes & arrays

I am new to puppet and decided to really get my feet wet by writing a 
duplicity module (https://github.com/JCotton1123/puppet-duplicity.git). I 
am struggling to deal with the fact that variables are immutable and cannot 
be reassigned (within the same scope). This has become a real issue while 
trying to dynamically build hashes and arrays that reflect the options and 
flags that are passed to duplicity. I opted for this approach b/c it makes 
composition easier and it results in a very clean template definition. For 
example,

```

  <%- @_flags.each do |flag| -%>
  <%= flag -%> \
  <%- end -%>
  <%- @_options.each do |key,val| -%>
  <%= key -%> <%= val -%> \
  <%- end -%>
```


As opposed to checking for the existence of a dozen different variables and 
outputting their values if they have a "good" value.

How do others work around this issue? I am looking at this the wrong way?

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