Custom + Method in Ruby String

Question

I am trying to modify the Ruby String class, specifically the + method. I want it to return a specific string, such that

 "a" + "b" => "custom_result"

Here's what I have:

class String

  def +(a)
    "custom_result"
  end

end

When I try to require this file in irb, "custom_result" is in my prompt, and I can't execute anything. Any ideas?

What if you require this in another file, not IRB? – Sergio Tulentsev Feb 13 '13 at 17:40 — Sergio Tulentsev, Feb 13 '13 at 17:40
Just tried in rspec, and am getting expected result. – ragingsquirrel3 Feb 13 '13 at 17:45 — ragingsquirrel3, Feb 13 '13 at 17:45

score 4 · Accepted Answer · answered Feb 13 '13 at 17:41

4

Well, IRb uses the String class both to print the results and to parse what you type into it. If you mess with that, IRb breaks, that's not really surprising.

answered Feb 13 '13 at 17:41

Jörg W Mittag

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Custom + Method in Ruby String

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