Jason Creighton
9/4/2003 10:13:00 PM
On 4 Sep 2003 04:10:32 -0700
ejb@theworld.com (Ed Baker) wrote:
> I''m interested in using the prettyprint module available from RAA.
>
> But, as a relatively new Rubyist, I can''t seem to make sense of the
> included RDOCS.
>
> Has anyone got some simple examples they could share?
prettyprint is now included in Ruby, at least as of 1.8. Just from
reading the commands in prettyprint.rb, it appears prettyprint is a
module for building, well, pretty printers.
I can''t share any examples for prettyprint, but I can share some for
''pp'', a library which builds upon prettyprint to provide nice output for
Ruby objects. For example:
>> require ''pp''
=> true
>> ary = Array.new(5) { |i| Array.new(5) { |j| i*j } }
=> [[0, 0, 0, 0, 0], [0, 1, 2, 3, 4], [0, 2, 4, 6, 8], [0, 3, 6, 9, 12], [0, 4, 8, 12, 16]]
>> pp ary
[[0, 0, 0, 0, 0],
[0, 1, 2, 3, 4],
[0, 2, 4, 6, 8],
[0, 3, 6, 9, 12],
[0, 4, 8, 12, 16]]
=> nil
>> pp ENV.select { |k,v| k.length == 3 }
[["PWD", "/usr/lib/ruby/1.8"],
["PS1", "\\w\\$ "],
["PS2", "> "],
["XWM", "ion"]]
=> nil
....and so on. YAML can help pretty-print as well:
>> h = {}; 5.times { |i| h[i] = i**4 }; puts h.to_yaml
---
0: 0
1: 1
2: 16
3: 81
4: 256
=> nil
YAML defines a ''y'' method that''s shorthand for puts obj.to_yaml, ie:
>> h = { "goober" => "lala", 123 => 456, 3.1415 => "PI" }
=> {"goober"=>"lala", 3.1415=>"PI", 123=>456}
>> y h
---
goober: lala
3.1415: PI
123: 456
=> nil
Fun stuff.
Jason Creighton