Which methods does "puts" invoke?

[Iñaki Baz Castillo]

Hi, if I redefine "to_s" or "inspect" methods in String class I still get t=
he=20
original output when doing:

puts string

Which String@method is invoked when executing "puts"?

Thanks.

=2D-=20
I=C3=B1aki Baz Castillo <[email protected]>

 

[Eric Jacoboni]

Hi, if I redefine "to_s" or "inspect" methods in String class I still get the
original output when doing:

puts string

Which String@method is invoked when executing "puts"?

to_s (inspect is called by p)

to_s called
=> nil

 

[Lyle Johnson]

Hi, if I redefine "to_s" or "inspect" methods in String class I still get= the
original output when doing:

=A0puts string

Which String@method is invoked when executing "puts"?

Based on my cursory inspection of the internals (in io.c) it doesn't
appear that puts() is actually calling any of String's methods, at
least not in any way that you can override them.

 

[Iñaki Baz Castillo]

El Lunes 30 Marzo 2009, Eric Jacoboni escribi=F3:

to_s (inspect is called by p)


=3D> nil




=3D> nil


to_s called
=3D> nil

Well, I already tested it, and yes, it seems to work if you define to_s met=
hod=20
in some custom class, but note the following:

=2D-------
class String
def to_s
"hiiiiiii"
end
end

# s=3DString.new("qweqwe")
# puts s
qweqwe
nil
=2D----------

=BF?

=2D-=20
I=F1aki Baz Castillo <[email protected]>

 

[Eric Jacoboni]

--------
class String
def to_s
"hiiiiiii"
end
end

# s=String.new("qweqwe")
# puts s
qweqwe
nil
-----------

Oh yes, you're right... puts doesn't use to_s when called on a String.

 

[Rob Olson]

Hi, if I redefine "to_s" or "inspect" methods in String class I still getthe
original output when doing:

  puts string

Which String@method is invoked when executing "puts"?

Thanks.

From the rdoc of IO#puts (http://www.ruby-doc.org/core-1.8.7/classes/
IO.html#M000474) it states that puts "writes the given objects to ios
as with IO#print". So puts calls print.

Further, the rdoc for IO#print ssays that objects passed to it "that
aren‘t strings will be converted by calling their to_s method."

 

[Brian Candler]

Oh yes, you're right... puts doesn't use to_s when called on a String.

Nor on nil. (It prints "nil", whereas nil.to_s is the empty string)