Monthly Downloads: 23,814
Programming language: Ruby
License: MIT License
Tags: Hash     Hashes     Data Structures     Extensions    

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HashDot allows you to get and set your Ruby hash properties with a dot syntax.

  require 'hash_dot'

  user = {name: 'Anna', job: {title: 'Programmer'}}.to_dot

  user.job.title #=> 'Programmer'
  user.job.title = 'Senior Programmer'
  user.job.title #=> 'Senior Programmer'
  user.job.title #=> NoMethodError
  user.job.title = 'Engineer'
  user.job.title #=> 'Engineer'
  user.job.department = 'DevOps'
  user.job.department #=> 'DevOps'
  user.send('beverages=', {}.to_dot)
  user.send('beverages.coffee=', 'Short Black')
  user.send('beverages.coffee') #=> 'Short Black'
  user #=> {:name=>'Anna', :job=>{:title=>'Engineer', :department=>'DevOps'}, :beverages=> { :coffee => 'Short Black'} }

You can also allow dot syntax for all hashes via the class setting.

Hash.use_dot_syntax = true

{name: 'Pat'}.name #=> 'Pat'

By default HashDot raises a NoMethodError when accessing a non-existent key with the dot syntax. The value of Hash#default can be used instead, either globally or per-instance, via:

# globally
Hash.use_dot_syntax = true
Hash.hash_dot_use_default = true
{}.a #=> 'default'

# per instance
h = Hash.new('default').to_dot(use_default: true)
h.a #=> 'default'
{}.to_dot.a #=> NoMethodError


Add this line to your application's Gemfile:

gem 'hash_dot'

And then execute:

$ bundle

Or install it yourself as:

$ gem install hash_dot


Benchmarks should be taken with a grain of salt, as always. For example, OpenStruct is much slower to initialize, but calls its methods faster once initialized. The OpenStruct solution also can't traverse more than a single dot without recursively instantiating all sub-hashes into OpenStructs.

require 'ostruct'
require 'benchmark'
require 'hash_dot'

user = { address: { category: { desc: 'Urban'}}}.to_dot

iterations = 50000

Benchmark.bm(8) do |bm|
  bm.report("Default Notation   :") {
    iterations.times do; user[:address][:category][:desc]; end

  bm.report("Dot Notation       :") {
    iterations.times do; user.address.category.desc; end

  bm.report("OpenStruct         :") {
    iterations.times do; OpenStruct.new(user); end

  # Minus OpenStruct instantiation cost
  os_user = OpenStruct.new(user)
  bm.report("OpenStruct Single  :") {
    iterations.times do; os_user.address; end

  bm.report("Dot Notation Single:") {
    iterations.times do; user.address; end

# Benchmark Example
#                       user     system      total        real
Default Notation   :  0.010000   0.000000   0.010000 (  0.008807)
Dot Notation       :  0.190000   0.000000   0.190000 (  0.195819)
OpenStruct         :  0.400000   0.010000   0.410000 (  0.399542)
OpenStruct Single  :  0.010000   0.000000   0.010000 (  0.011259)
Dot Notation Single:  0.080000   0.000000   0.080000 (  0.082606)


Bug reports and pull requests are welcome on GitHub at https://github.com/adsteel/hash_dot. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](CODE_OF_CONDUCT.md) code of conduct.


The gem is available as open source under the terms of the MIT License.

*Note that all licence references and agreements mentioned in the HashDot README section above are relevant to that project's source code only.