Appending to an existing string
RubyRuby Problem Overview
To append to an existing string this is what I am doing.
s = 'hello'
s.gsub!(/$/, ' world');
Is there a better way to append to an existing string.
Before someone suggests following answer lemme show that this one does not work
s = 'hello'
s.object_id
s = s + ' world'
s.object_id
In the above case object_id will be different for two cases.
Ruby Solutions
Solution 1 - Ruby
You can use << to append to a string in-place.
s = "foo"
old_id = s.object_id
s << "bar"
s #=> "foobar"
s.object_id == old_id #=> true
Solution 2 - Ruby
you can also use the following:
s.concat("world")
Solution 3 - Ruby
Can I ask why this is important?
I know that this is not a direct answer to your question, but the fact that you are trying to preserve the object ID of a string might indicate that you should look again at what you are trying to do.
You might find, for instance, that relying on the object ID of a string will lead to bugs that are quite hard to track down.
Solution 4 - Ruby
Yet an other way:
s.insert(-1, ' world')
Solution 5 - Ruby
Here's another way:
fist_segment = "hello,"
second_segment = "world."
complete_string = "#{first_segment} #{second_segment}"