Fossicker

fossick is a fetch-like version of Ruby's dig. It supports defaults and will raise an exception if it finds a missing key or index (unless you supply a default).

Add this line to your application's Gemfile:

gem "fossicker"

And then execute:

$ bundle

Or install it yourself as:

$ gem install fossicker

Use the Fossicker refinement to add fossick to Array and Hash.

using Fossicker

# Basic use

{ a: { b: "paydirt" } }.fossick :a, :b 
# => "paydirt"


# Fossick through arrays and hashes

[ "nothing here", { a: [ { b: "paydirt" } ] } ].fossick 1, :a, 0, :b
# => "paydirt"


# Missing key or index

{ a: [ { b: "paydirt" } ] }.fossick :a, 1, :b
# => IndexError: index 1 outside of array bounds: -1...1


# Supplying a default value

{ a: [ { b: "paydirt" } ] }.fossick :a, 1, :b, default: "zilch"
# => "zilch"


# Using a block for the default value

{ a: [ { b: "paydirt" } ] }.fossick :a, 0, :c do |key| 
  "Nothing for #{key.inspect}"
end
# => "Nothing for :c"


# Emulating `dig`

{ a: [ "paydirt" ] }.fossick :a, 0, default: nil
# => nil

If you don't want to use refinements, or can't because of Ruby's refinement scoping quirks, you can use the module method directly.

object = { a: { b: "paydirt" } }
Fossicker.fossick object, :a, :b 
# => "paydirt"

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/johncarney/fossicker. 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.

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