https://github.com/junegunn/each_line_reverse

Read lines of a file in reverse order
https://github.com/junegunn/each_line_reverse

Last synced: 28 days ago
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Read lines of a file in reverse order

• Host: GitHub
• URL: https://github.com/junegunn/each_line_reverse
• Owner: junegunn
• License: mit
• Created: 2013-05-14T15:33:27.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2013-05-14T15:37:00.000Z (over 11 years ago)
• Last Synced: 2024-09-14T12:28:08.106Z (about 2 months ago)
• Language: Ruby
• Size: 105 KB
• Stars: 4
• Watchers: 4
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.txt

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README

        
each_line_reverse

=================

Read lines of a file in reverse order.

Installation

------------

Add this line to your application's Gemfile:

    gem 'each_line_reverse'

And then execute:

    $ bundle

Or install it yourself as:

    $ gem install each_line_reverse

Usage

-----

```ruby

require 'each_line_reverse'

File.open('long-long-file').each_line_reverse do |line|

  # line.chomp

end

# Returns an enumerator when block is not given

enum = File.open('long-long-file').each_line_reverse

last_10x10 = enum.each_slice(10).take(10)

# Optional parameters:

# - Line separator   (default: $/)

# - Read buffer size (default: 8192)

enum = File.open('long-long-file').each_line_reverse("\r\n", 16384)

```

Benchmark

---------

```ruby

require 'benchmark'

require 'each_line_reverse'

Benchmark.bm { |x|

  x.report(:each_line_reverse) {

    File.open('long-long-file').each_line_reverse.take(10)

  }

  x.report(:reverse) {

    File.readlines('long-long-file').reverse.take(10)

  }

}

```

### 1 million-line file

```

                           user     system      total        real

each_line_reverse      0.000000   0.000000   0.000000 (  0.027401)

reverse                1.000000   0.260000   1.260000 (  1.266308)

```

### 10 million-line file

```

                           user     system      total        real

each_line_reverse      0.000000   0.000000   0.000000 (  0.021664)

reverse               12.590000   3.250000  15.840000 ( 19.271157)

```

Contributing

------------

1. Fork it

2. Create your feature branch (`git checkout -b my-new-feature`)

3. Commit your changes (`git commit -am 'Add some feature'`)

4. Push to the branch (`git push origin my-new-feature`)

5. Create new Pull Request