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<title>param (RMail::Header)</title>
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<pre><span class="cmt"># File lib/rmail/header.rb, line 617</span>
<span class="kw">def</span> param(field_name, param_name, default = <span class="kw">nil</span>)
<span class="kw">if</span> field?(field_name)
params = params_quoted(field_name)
value = params[param_name]
<span class="kw">return</span> Utils.unquote(value) <span class="kw">if</span> value
<span class="kw">end</span>
<span class="kw">if</span> block_given?
<span class="kw">yield</span> field_name, param_name
<span class="kw">else</span>
default
<span class="kw">end</span>
<span class="kw">end</span></pre>
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