This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.

closed? 

        # IO.closed?

(from ruby core)
---
    ios.closed?    -> true or false

---

Returns `true` if *ios* is completely closed (for duplex streams, both
reader and writer), `false` otherwise.

    f = File.new("testfile")
    f.close         #=> nil
    f.closed?       #=> true
    f = IO.popen("/bin/sh","r+")
    f.close_write   #=> nil
    f.closed?       #=> false
    f.close_read    #=> nil
    f.closed?       #=> true

This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.