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copied!<p>Actually, auto-completion does work for <code>.</code>. The completion options are found by calling <code>#methods</code> on the object. You can see this for yourself by overriding <code>Object.methods</code>:</p> <pre><code>>> def Object.methods; ["foo", "bar"]; end => nil >> Object.[TAB] Object.foo Object.bar >> Object. </code></pre> <p>Note that this only works when the expression to the left of the <code>.</code> is a literal. Otherwise, getting the object to call <code>#methods</code> on would involve evaluating the left-hand side, which could have side-effects. You can see this for yourself as well:</p> <pre><code>[continuing from above...] >> def Object.baz; Object; end => nil >> Object.baz.[TAB] Display all 1022 possibilities? (y or n) </code></pre> <p>We add a method <code>#baz</code> to <code>Object</code> which returns <code>Object</code> itself. Then we auto-complete to get the methods we can call on <code>Object.baz</code>. If IRB called <code>Object.baz.methods</code>, it would get the same thing as <code>Object.methods</code>. Instead, IRB has 1022 suggestions. I'm not sure where they come from, but it's clearly a generic list which isn't actually based on context.</p> <p>The <code>::</code> operator is (also) used for getting a module's constants, while <code>.</code> is not. That's why <code>HTTP</code> will show up in the completion for <code>Net::</code>, but not for <code>Net.</code>. <code>Net.HTTP</code> isn't correct, but <code>Net::HTTP</code> is.</p>

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