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
– Sergio Tulentsev

2013-02-13 17:40:00 +00:00
Commented Feb 13, 2013 at 17:40 — Sergio Tulentsev
– Sergio Tulentsev, Commented Feb 13, 2013 at 17:40
Just tried in rspec, and am getting expected result.

ragingsquirrel3
– ragingsquirrel3

2013-02-13 17:45:21 +00:00
Commented Feb 13, 2013 at 17:45 — ragingsquirrel3
– ragingsquirrel3, Commented Feb 13, 2013 at 17:45

Jörg W Mittag · Accepted Answer · 2013-02-13 17:41:55Z

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, 2013 at 17:41

Jörg W Mittag

371k79 gold badges457 silver badges666 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Custom + Method in Ruby String

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related