https://github.com/oieioi/with_last.rb

💎 Enumerable#each_with_last and Enumerator#with_last
https://github.com/oieioi/with_last.rb

ruby

Last synced: 9 months ago
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💎 Enumerable#each_with_last and Enumerator#with_last

• Host: GitHub
• URL: https://github.com/oieioi/with_last.rb
• Owner: oieioi
• License: mit
• Created: 2019-12-24T09:59:38.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2020-03-04T03:44:59.000Z (over 6 years ago)
• Last Synced: 2025-10-09T03:19:34.875Z (9 months ago)
• Topics: ruby
• Language: Ruby
• Homepage: https://rubygems.org/gems/with_last
• Size: 20.5 KB
• Stars: 4
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.txt
  • Code of conduct: CODE_OF_CONDUCT.md

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README

          
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# with_last.rb

- Add `with_last` method to `Enumerator` class.

- Add `last?` method to `Enumerator` class.

- Add `each_with_last` to `Enumerable` module.

## Installation

```ruby

gem 'with_last'

```

And then execute:

    $ bundle install

## Usage

### `Enumerable#each_with_last`

```ruby

[1,2,3].each_with_last { |item, last|

  print "#{item}#{last ? '!' : ' => '}"

}

```

it prints `1 => 2 => 3!`

### `Enumerator#with_last`

```ruby

[1,2,3]

  .map

  .with_last { |item, last| "#{item * item}#{last ? '.' : ''}" }

  .join(',')

```

it returns `"1,4,9."`

### `Enumerator#last?`

```ruby

e = [1,2].to_enum

e.last? # => false

e.next  # => 1

e.last? # => false

e.next  # => 2

e.last? # => true

```

### in ERB

```erb

<% %w[hoge fuga piyo].each_with_last do |item, is_last| %>

  <%= item %><%= is_last ? '.' : ', ' %>

<% end %>

```

it renders;

```html

hoge, fuga, piyo.

```

## License

The gem is available as open source under the terms of the [MIT License](https://opensource.org/licenses/MIT).