Lightweight Ruby core extensions

• count_by
• hash_map
• mapk, mapk!
• mapv, mapv!
• to_b

Plays nicely with the Ruby core and ActiveSupport.

Add this line to your application’s Gemfile:

gem 'lightcore'

Groups and counts an array

users.count_by(&:country_code)
# {
#   "US" => 5,
#   "DE" => 2
# }

Converts an array of key-value pairs to a hash

users.hash_map{|u| [u.id, u.name] }
# {
#   1 => "Nick",
#   2 => "Andrew"
# }

Updates the keys of a hash

hash.mapk{|k| k.to_sym }

mapk! updates the original hash

Updates the values of a hash

hash.mapv{|v| v[0] }

mapv! updates the original hash

Converts an object to a boolean - works great with strings

"true".to_b   # true
"hi".to_b     # true
"false".to_b  # false
"f".to_b      # false
nil.to_b      # false

Everyone is encouraged to help improve this project. Here are a few ways you can help:

• Report bugs
• Fix bugs and submit pull requests
• Write, clarify, or fix documentation
• Suggest or add new features