Filter any kind of array with the power of ruby, with ease and 😄
It's short, dynamic and readable. Its trace is a usefull tool for teachers.
The performance is inversely proportional to the comfort although efficiency is improved in the latest versions. See the section below.
require 'philter'
# You can use everything to filter
# ...single value
[1,2,3].philter 1
=> [1]
# ...array of values
[1,2,3].philter [2,3]
=> [2,3]
# ...operators
[1,2,3].philter '<= 2'
=> [1,2]
[1,2,3].philter '!= 2'
=> [1,3]
# ...range
[1,2,3,4,5].philter 2..4
=> [2, 3, 4]
%w[red green blue].philter 'red'
=> ["red"]
%w[red green blue].philter %w(red blue)
=> ["red", "blue"]
# You can pass a block
[1,2,3].philter([1,2]) { |e| e*2 }
=> [2, 4]Things get more interesting with array of hashes or objects 😋
people = [{ id: 1, name: 'Mark', email: '[email protected]' },
{ id: 2, name: 'Larry', email: '[email protected]' },
{ id: 3, name: 'Bill', email: '[email protected]' }
]
people.philter id: 1
=> [{:id=>1, :name=>"Mark", :email=>"[email protected]"}]
people.philter id: [1,3]
=> [{:id=>1, :name=>"Mark", :email=>"[email protected]"}, {:id=>3, :name=>"Bill", :email=>"[email protected]"}]
people.philter id: '>2'
=> [{:id=>3, :name=>"Bill", :email=>"[email protected]"}]
# Regular expression
people.philter email: /@gmail/
=> [{:id=>1, :name=>"Mark", :email=>"[email protected]"}, {:id=>2, :name=>"Larry", :email=>"[email protected]"}]
# Select attributes
people.philter({ email: /@gmail/ }, get: :name)
=> ["Mark", "Larry"]
# Philter with more attributes -and-
people.philter name: /M.+/, email: /@gmail/
=> [{:id=>1, :name=>"Mark", :email=>"[email protected]"}]
# Philter with more attributes -or-
people.philter({ name: /M.+/, email: /@live/ }, or: true)
=> [{:id=>1, :name=>"Mark", :email=>"[email protected]"}, {:id=>3, :name=>"Bill", :email=>"[email protected]"}]To me the power! 
# Select and update attributes
regexp = /gmail/
people.philter(email: regexp) { |e| "#{e[:name]} use #{e[:email].match(regexp)}!"}
=> ["Mark use gmail!", "Larry use gmail!"]
# Add attributes
people.philter(email: /@gmail/) do |e|
e[:filtered] = true
e
end
=> :try_yourselfRemember how to pass arguments:
people.philter { ...filters... }, { ...options... }
# YES
[1,2,3].philter '<= 2', debug: true
people.philter({ id: 1 }, debug: true)
# NO (debug is not an attribute to filter but an option)
people.philter(id: 1, debug: true)Get the trace with the option debug: true
[1,2,3].philter '<= 2', debug: true
--------------- Start debugging philter 1.1.0 -------------
Search by String: <= 2 with operator
item Fixnum 1
item <= value | 1 <= 2 => x
item Fixnum 2
item <= value | 2 <= 2 => x
item Fixnum 3
item <= value | 3 <= 2
--------------- End debugging philter 1.1.0 ---------------
2 item(s) found
=> [1, 2]
people.philter({ name: 'Mark', email: /\A.+gmail/ }, debug: true)
--------------- Start debugging philter 1.1.0 ---------------
Search by Hash:
item {:id=>1, :name=>"Mark", :email=>"[email protected]"} (Hash)
evaluating with hash
search: name: Mark (String)
.4 v1 item[name] item == value | Mark == Mark => x
search: email: (?-mix:\A.+gmail) (Regexp)
.1 v1 item[email] item =~ value | mark@gmail.com =~ (?-mix:\A.+gmail) => x
- SELECTED - (And)
item {:id=>2, :name=>"Bill", :email=>"[email protected]"} (Hash)
evaluating with hash
search: name: Mark (String)
.4 v1 item[name] item == value | Bill == Mark
search: email: (?-mix:\A.+gmail) (Regexp)
.1 v1 item[email] item =~ value | bill@live.com =~ (?-mix:\A.+gmail)
item {:id=>3, :name=>"Larry", :email=>"[email protected]"} (Hash)
evaluating with hash
search: name: Mark (String)
.4 v1 item[name] item == value | Larry == Mark
search: email: (?-mix:\A.+gmail) (Regexp)
.1 v1 item[email] item =~ value | larry@gmail.com =~ (?-mix:\A.+gmail) => x
--------------- End debugging philter 1.1.0 ---------------
1 item(s) found
=> [{:id=>1, :name=>"Mark", :email=>"[email protected]"}]Rails return relation objects that must be turned to array
cities = City.all.to_a
City Load (1.0ms) SELECT "cities".* FROM "cities"
=> ... [cut]
cities.philter id: 1
=> [#<City id: 1, name: "Milano", code: "MI", region: "Lombardia", created_at: "2016-05-10 09:07:22", updated_at: "2016-05-10 09:07:22">]
cities.philter code: 'PA'
=> [#<City id: 4, name: "Palermo", code: "PA", region: "Sicilia", created_at: "2016-05-10 09:08:13", updated_at: "2016-05-10 09:08:13">]
# Pass a block to select, update or change the result
cities.philter(region: /\Alomb/i) { |city| "#{city.name}-#{city.code}" }
=> ["Milano-MI", "Lecco-LC", "Pavia-PV", "Piacenza-PC", ... [cut]Since version 1.0.0 performance are greatly improved!
Ruby 2.2.3p173 on windows 7 with i5 3570K Ivy Bridge @4200 Mhz Ram 16Gb 10-10-10-27 2T @686Mhz
require 'benchmark'
require 'philter'
ar_test = 100.times.map { |n| n }
Benchmark.bmbm do |x|
x.report("philter: ") { 10_000.times { ar_test.philter 1 } }
x.report("grep: ") { 10_000.times { ar_test.grep 1 } }
end
#version 1.0.0
user system total real
philter: 0.031000 0.000000 0.031000 ( 0.021759)
grep: 0.016000 0.000000 0.016000 ( 0.007115)
#version 0.7.0
user system total real
philter: 9.204000 0.000000 9.204000 ( 9.254443)
grep: 0.062000 0.000000 0.062000 ( 0.054257)range = 1..10
Benchmark.bmbm do |x|
x.report("philter: ") { 10_000.times { ar_test.philter range } }
x.report("grep: ") { 10_000.times { ar_test.grep range } }
end
#version 1.0.0
user system total real
philter: 0.015000 0.000000 0.015000 ( 0.023891)
grep: 0.000000 0.000000 0.000000 ( 0.009134)
#version 0.7.0
=> Range was not managed
user system total real
philter: 91.136000 0.000000 91.136000 ( 91.305855)
grep: 0.172000 0.000000 0.172000 ( 0.182490)ar_search = [1,3,5,7]
Benchmark.bmbm do |x|
x.report("philter: ") { 10_000.times { ar_test.philter ar_search } }
x.report("select: ") { 10_000.times { ar_test.select { |item| ar_search.include?(item) } } }
end
#version 1.0.0
user system total real
philter: 0.062000 0.000000 0.062000 ( 0.052933)
select: 0.031000 0.000000 0.031000 ( 0.022178)
#version 0.7.0
user system total real
philter: 36.176000 0.000000 36.176000 ( 36.182101)
select: 0.078000 0.000000 0.078000 ( 0.073341)Benchmark.bmbm do |x|
x.report("philter: ") { 1_000.times { ar_test.philter '< 50' } }
x.report("select: ") { 1_000.times { ar_test.select { |item| item < 50 } } }
end
#version 1.0.0
user system total real
philter: 2.855000 0.000000 2.855000 ( 2.851040)
select: 0.015000 0.000000 0.015000 ( 0.004312)
#version 0.7.0
user system total real
philter: 3.744000 0.000000 3.744000 ( 3.746851)
select: 0.016000 0.000000 0.016000 ( 0.004338)Strings
require 'benchmark'
require 'philter'
ar_test = %w(black white grey red green blue yellow orange pink purple violet)
ar_search = %w(red green blue)
Benchmark.bmbm do |x|
x.report("philter: ") { 10_000.times { ar_test.philter ar_search } }
x.report("select: ") { 10_000.times { ar_test.select { |item| ar_search.include? item } } }
end
#version 1.0.0
user system total real
philter: 0.063000 0.000000 0.063000 ( 0.062890)
select: 0.015000 0.000000 0.015000 ( 0.011407)
#version 0.7.0
user system total real
philter: 7.363000 0.000000 7.363000 ( 7.359162)
select: 0.000000 0.000000 0.000000 ( 0.011539)ar_test = [ { id: 1, name: 'Mark', email: '[email protected]' },
{ id: 2, name: 'Bill', email: '[email protected]' },
{ id: 3, name: 'Larry', email: '[email protected]' }]
regexp = /\A.+gmail/
Benchmark.bmbm do |x|
x.report("philter: ") { 10_000.times { ar_test.philter email: regexp } }
x.report("select: ") { 10_000.times { ar_test.select { |item| item[:email] =~ regexp } } }
end
#version 1.0.0
user system total real
philter: 0.218000 0.000000 0.218000 ( 0.221822)
select: 0.000000 0.000000 0.000000 ( 0.003418)
#version 0.7.0
user system total real
philter: 0.468000 0.000000 0.468000 ( 0.473782)
select: 0.000000 0.000000 0.000000 ( 0.003429)Ruby 2.1+
Ruby 1.9+ has been tested up to v1.2.0
gem install philter
To use it in a bundle, add to gem file gem 'philter' and run bundle install
- Add boolean operator to chain of conditions
v1.0.0 - Improve performance keeping the operations's trace
v1.0.0 - Add blocks
v1.0.0 - Increase performance further
- Fork it
- Create your feature branch (
git checkout -b my-feature) - Commit your changes (
git commit -am 'I made extensive use of all my creativity') - Push to the branch (
git push origin my-feature) - Create new Pull Request
Wide coverage with 39 unit tests and 155 assertions
To test locally install the development requirements
bundle install
Then execute
bundle exec ruby test/unit_test.rb
Performance tests are calibrated to not exceed 1.2 seconds on my pc with a tolerance become 2 seconds:
bundle exec ruby test/performance_test.rb
Loaded suite test/performance_test
Started
........
Finished in 8.505 seconds.
--------------------------------------------------------------------------------
8 tests, 8 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
100% passed
--------------------------------------------------------------------------------
0.94 tests/s, 0.94 assertions/s
If you have a very slow pc it could not pass. In this case you can pass a higher tolerance value as argument, for example 3 seconds:
bundle exec ruby test/performance_test.rb 3.0
Please open an issue.
The GNU Lesser General Public License, version 3.0 (LGPL-3.0) See LICENSE file
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