Izzy has been deprecated in favor of Qo: https://github.com/baweaver/qo
Qo achieves much of the same functionality and more without the need to monkeypatch, and is in many ways the spiritual successor to Izzy. Four years makes a lot of difference!
To demo Izzy, let's make a Person:
brandon = Person.new('brandon', 23, 'm')Let's do some matching against it:
brandon.matches_all? name: /^br/, age: (20..30) # => true
brandon.matches_any? name: /br$/, age: (20..30) # => true
brandon.matches_none? name: /br&/, age: (30..40) # => truePerhaps you want to type check:
brandon.matches_all? name: String, age: IntegerNeed a bit more power? We have Lambdas for that!
longer_than_3 = -> n { n.length > 3 }
is_odd = -> a { a.odd? }
brandon.matches_all? name: longer_than_3, age: is_odd # => true....or let's push it further for some interesting results:
longer_than_5 = -> n { n.length > 5 }
greater_than_20 = -> a { a > 20 }
brandon.matches_all?(
name: [/br/, /an/, longer_than_5],
age: [(20..30), greater_than_20]
)
# => true...and do some comparisons on boolean methods!
brandon.all_of? :older_than_18?, :male?, :me?, :geek? # => true
brandon.none_of? :younger_than_18?, :female? # => true
brandon.any_of? :male?, :female?, :geek? # => trueIzzyArray allows you a few more tricks on top of that!
class Array; include IzzyArray end
[0,0,0].all_are :zero? # => true
[0,nil,'foo'].any_are :zero? # => true
[0,0,0].none_are :nil? # => trueCombine with rails :present?, :empty?, and various other methods and you have some interesting results! This one will get some more power with experimentation.
Let's get ourselves a collection to use:
class Object; include Izzy end
brandon = Person.new('brandon', 23, 'm')
john = Person.new('john', 42, 'm')
jill = Person.new('jill', 31, 'f')
alice = Person.new('alice', 50, 'f')
zeke = Person.new('zeke', 18, 'm')
people = [brandon, john, jill, alice, zeke]Select all objects where params match:
people.select_where name: /^j/
# => [john, jill]
people.select_where(
age: [
(20..35),
-> a { a.odd? }
]
)
# => [brandon]Reject all objects where params match:
people.reject_where name: /^j/
# => [brandon, alice, zeke]
people.reject_where(
age: [
(20..35),
-> a { a.odd? }
]
)
# => [john, jill, alice, zeke]Finds the first object where params match:
people.find_where name: /^j/, gender: 'm'
# => johnAdd this line to your application's Gemfile:
gem 'izzy'
And then execute:
$ bundle
Or install it yourself as:
$ gem install izzy
It patches object, just use it with any method that matches the pattern is_foo? and you're good to go!
- Fork it ( http://github.com/baweaver/izzy/fork )
- Create your feature branch (
git checkout -b my-new-feature) - Commit your changes (
git commit -am 'Add some feature') - Push to the branch (
git push origin my-new-feature) - Create new Pull Request