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    <p>First of all, the way to list singleton methods is with <code>singleton_methods</code>. The <code>methods</code> method returns a list of the names of public and protected methods of the object. Also, it is defined in the <a href="http://ruby-doc.org/core-2.3.0/Object.html#method-i-methods" rel="nofollow noreferrer"><code>Object</code></a> class. Try <code>extend</code>ing an instance. It is one of the most elegant ways, as it supports code reuse and seems to me very object-oriented:</p> <pre><code>class Foo def bar puts "Hi" end end module Bar def foo puts "Bye" end end f = Foo.new f.bar #=&gt; hi f.extend Bar f.foo #=&gt; bye f.methods(false) #=&gt; [] # the module we extended from is not a superclass # therefore, this must be empty, as expected f.singleton_methods #=&gt; ["foo"] # this lists the singleton method correctly g = Foo.new g.foo #=&gt; NoMethodError </code></pre> <p><strong>Edit</strong>: In the comment you asked why <code>methods(false)</code> returns nothing in this case. After reading through the C code it seems that:</p> <ul> <li><code>methods</code> returns all the methods available for the object (also the ones in included modules)</li> <li><code>singleton_methods</code> returns all the singleton methods for the object (also the ones in included modules) (<a href="http://ruby-doc.org/core/classes/Object.html#M001026" rel="nofollow noreferrer">documentation</a>)</li> <li><code>singleton_methods(false)</code> returns all the singleton methods for the object, but <strong>not</strong> those declared in included modules</li> <li><code>methods(false)</code> supposedly returns the singleton methods by calling <code>singleton_methods</code>, <strong>but</strong> it also passes the parameter <code>false</code> to it; whether this is a bug or a feature - I do not know</li> </ul> <p>Hopefully, this clarifies the issue a little. Bottom line: call <code>singleton_methods</code>, seems more reliable.</p>
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    1. PORuby Singleton methods for class and objects
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    1. COThank you, nice feature, i didn't know about it. But why `methods(false)` don't show added method?
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      1. USVladimir Tsukanov
    2. COI can also extend `class` this way
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    3. COI experimented with `methods(false)` and concluded that `method(false)` show only own object's methods, it not show methods from upper classes in ancestor chain
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      1. USVladimir Tsukanov
 

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