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strip! 

        # String.strip!

(from ruby core)
---
    str.strip!   -> self or nil

---

Removes leading and trailing whitespace from the receiver. Returns the
altered receiver, or `nil` if there was no change.

Refer to String#strip for the definition of whitespace.

    "  hello  ".strip!  #=> "hello"
    "hello".strip!      #=> nil

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.