How to convert string to UpperCamelCase in Ruby?

Question

I want to turn string into CamelCase fashion In Ruby. The question also applies to words with underscores.

For example:

"human" => "Human"
"little_human" => "LittleHuman"

How can I do this?

Sergii K · Answer 1 · 2016-05-31T09:38:53.860

3

With regexp:

def camelize(str)
  str.gsub(/(^.)|(_.)/) { |l| l[-1].upcase }
end

edited May 31 '16 at 09:38

answered May 31 '16 at 09:28

Sergii K

This returns `Little_Human` – Stefan May 31 '16 at 09:35
Sorry, my bad. Update answer. – Sergii K May 31 '16 at 09:39
2

`gsub(/(^|_)(.)/) { $2.upcase }` would also work if you don't mind global variables. – Stefan May 31 '16 at 09:45
Nice refactoring, thanks @Stefan. – Sergii K May 31 '16 at 09:46

Ursus · Accepted Answer · 2016-05-31T09:50:51.780

2

In rails there is a camelize method. In ruby you can write the method on your own. Something like

def camelize(s)
  s.downcase.split('_').map(&:capitalize).join
end

edited May 31 '16 at 09:50

answered May 31 '16 at 09:12

Ursus

1

use also like this @Ursus "little_human".downcase.split("_").map(&:titleize).join => "LittleHuman" – VijayGupta May 31 '16 at 09:46
3

@vijay13 this is a pure-ruby solution, `titleize` require Rails. – Stefan May 31 '16 at 09:50

2 Answers2