Tash

Tash is a hash that allows for transformation of its keys. A transformation block is given to change the key. Keys can be looked up with any value that transforms into the same key. This means a hash can be string/symbol insensitive, case insensitive, can convert camel case JSON keys to snake case Ruby keys, or anything else based on the block you provide.

---

Installation

Add it to your Gemfile:

gem 'tash', '~> 1.0'

Or install it manually:

$ gem install tash --version '~> 1.0'

This project uses Semantic Versioning. Check out GitHub releases for a detailed list of changes.

Usage

Let's say that you wanted to have a hash where the keys are accessible as strings or symbols (i.e. ActiveSupport::HashWithIndifferentAccess).

t = Tash[one: 1, two: 2, &:to_s]
# => {"one"=>1, "two"=>2}

t[:one]
# => 1

t['one']
# => 1

t[:three] = 9 # oops
# => 9

t['three'] = 3
# => 3

t[:three]
# => 3

t['three']
# => 3

Lets say that you recieve a series of camel case JSON keys from an API call but want to access the information with Rubys typical snake case style and symbolized.

json = { "firstName" => "Adam", "lastName" => "DeCobray" }

t = Tash[json] do |key|
  key
    .to_s
    .gsub(/(?<!\A)([A-Z])/, '_\1')
    .downcase
    .to_sym
end

t[:first_name]
# => "Adam"

t['firstName']
# => "Adam"

This also works with pattern matching:

t = Tash[ONE: 1, MORE: 200, &:downcase]

case t
in { One: 1, More: more }
  more
else
  nil
end
# => 200

Tash implements to_hash for implicit hash conversion making it usable nearly everywhere you use a hash.

Tash has every instance method Hash has except for transform_keys and transform_keys!.

API Documentation

Contributing

If you want to contribute to Tash, please read our contribution guidelines. A complete list of contributors is available on GitHub.

License

Tash is licensed under the MIT License.