# Arrayfields-4.1.0

**URL:** <https://www.ruby-forum.com/t/arrayfields-4-1-0/114772>\
**Category:** Ruby\
**Created:** [September 17, 2007, 1:25pm UTC](https://www.ruby-forum.com/t/arrayfields-4-1-0/114772 "2007-09-17T13:25:31Z")\
**Posts on this page:** 9\
**Page:** 1

<div class="post-metadata">

**Author:** ![ara.t.howard](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/a8b319/32.png) [@ara.t.howard](https://www.ruby-forum.com/u/ara.t.howard)\
**Post date:** [September 17, 2007, 1:25pm UTC](https://www.ruby-forum.com/t/arrayfields-4-1-0/114772/1 "2007-09-17T13:25:31Z")

</div>

NAME  
arrayfields.rb

URIS  
[http://www.codeforpeople.com/lib/ruby/](http://www.codeforpeople.com/lib/ruby/)  
[http://rubyforge.org/projects/codeforpeople/](http://rubyforge.org/projects/codeforpeople/)

SYNOPSIS  
require ‘arrayfields’

```
 a = Arrayfields.new :k, :v, :a, :b

 p a[:k] #=> :v
 p a[:a] #=> :b
 p a.fields #=> [:k, :a]
 p a.values #=> [:v, :b]
 p a #=> [:v, :b]
 p a.to_hash #=> {:k => :v, :a => :b}
 p a.pairs #=> [[:k, :v], [:a, :b]]

 a[:foo] = :bar

 p a[:foo] #=> :bar
 p a.fields #=> [:k, :a, :foo]

```

AND

```
 require 'arrayfields'

 fields = 'name', 'age'
 a = ['zaphod', 42]

 a.fields = fields

 a['name'] #=> 'zaphod'
 a[:name] #=> 'zaphod'
 a.indices 'name', 'age' #=> ['zaphod', 42]

```

DESCRIPTION  
allow keyword access to array instances. arrayfields works by  
adding only a  
few methods to arrays, namely #fields= and fields, but the  
#fields= method is  
hooked to extend an array on a per object basis. in otherwords  
**only** those  
arrays whose fields are set will have auto-magical keyword access  
bestowed on  
them - all other arrays remain unaffected. arrays with keyword  
access require  
much less memory when compared to hashes/objects and yet still  
provide fast  
lookup and preserve data order.

LIST OF OVERRIDDEN METHODS  
Array#[]  
Array#slice  
Array#[]=  
Array#at  
Array#delete\_at  
Array#fill  
Array#values\_at  
Array#indices  
Array#indexes  
Array#slice!

LIST OF HASH-LIKE METHODS  
Array#each\_with\_field  
Array#each\_pair  
Array#each\_key  
Array#each\_value  
Array#fetch  
Array#has\_key?  
Array#member?  
Array#key?  
Array#has\_value?  
Array#value?  
Array#keys  
Array#store  
Array#values  
Array#to\_hash  
Array#to\_h  
Array#update  
Array#replace  
Array#invert  
Array#pairs

LIST OF ADDED Array METHODS  
Array#fields=  
Array#fields

LIST OF ADDED Array CLASS METHODS  
Array.fields/Array.struct

SAMPLES

\<========\< sample/a.rb \>========\>

~ \> cat sample/a.rb

```
 require 'arrayfields'
 #
 # the class Array has only a few added method, one is for

```

setting the fields,  
# when the fields are set for an array THIS INSTANCE ONLY will  
be modified to  
# allow keyword access. other arrays will not be affected!  
#  
a = [0,1,2]  
fields = [‘zero’, ‘one’, ‘two’]  
a.fields = fields # ONLY the Array ‘a’ is  
affected!  
#  
# keyword access is now allowed for many methods  
#  
p a[‘zero’] #=\> 0  
p a[‘one’] #=\> 1  
p a[‘two’] #=\> 2  
p a.at(‘one’) #=\> 1  
p a.values\_at(‘zero’, ‘two’) #=\> [0, 2]  
#  
# assigmnet is allowed  
#  
a[‘zero’] = 42  
p a[‘zero’] #=\> 0  
a[‘zero’] = 0  
#  
# assignment to non-fields results in the element being appended  
and the field  
# being added for future use (also appended)  
#  
p(a.fields.join(‘,’)) #=\> “zero, one, two”  
p a[‘three’] #=\> nil  
a[‘three’] = 3  
p(a.fields.join(‘,’)) #=\> “zero, one, two, three”  
p a[‘three’] #=\> 3  
#  
# other detructive methods are also keyword enabled  
#  
a.fill 42, ‘zero’, len = a.size  
p(a.values\_at(a.fields)) #=\> [42, 42, 42, 42]  
a.replace [0,1,2,3]

```
   a.slice! 'two', 2
   p a #=> [0,1]

```

~ \> ruby sample/a.rb

```
 0
 1
 2
 1
 [0, 2]
 42
 "zero,one,two"
 nil
 "zero,one,two,three"
 3
 [42, 42, 42, 42]
 [0, 1]

```

\<========\< sample/b.rb \>========\>

~ \> cat sample/b.rb

```
 require 'arrayfields'
 #
 # the struct class factory method can be used in much the same

```

way as ruby’s  
# own struct generators and is useful when the fields for a set  
of arrays is  
# known apriori  
#  
c = Array.struct :a, :b, :c # class generator  
a = c.new [42, nil, nil]  
a[:c] = 42  
p a #=\> [42, nil, 42]  
#  
# of course we can append too  
#  
a[:d] = 42.0  
p a[:d] #=\> 42.0  
p a #=\> [42, nil, 42, 42.0]

~ \> ruby sample/b.rb

```
 [42, nil, 42]
 42.0
 [42, nil, 42, 42.0]

```

\<========\< sample/c.rb \>========\>

~ \> cat sample/c.rb

```
 require 'arrayfields'
 #
 # the Array.fields methods generates an insance with those fields
 #
   a = Array.fields :a, :b, :c
   a[:a] = a[:c] = 42
   p a #=> [42, nil, 42]
   p a.fields #=> [:a, :b, :c]
   p a.values #=> [42, nil, 42]

```

~ \> ruby sample/c.rb

```
 [42, nil, 42]
 [:a, :b, :c]
 [42, nil, 42]

```

\<========\< sample/d.rb \>========\>

~ \> cat sample/d.rb

```
 require 'arrayfields'
 #
 # the Arrayfields.new method is a contruct that takes evenly

```

numbered pairs of  
# arbitrary objects and builds up and fielded array  
#  
a = Arrayfields.new :key, :value, :a, :b  
p a.fields #=\> [:key, :a]  
p a.values #=\> [:value, :b]  
#  
# you can use a hash - but of course the ordering gets lost in  
the initial  
# hash creation. aka the order of fields get horked by the  
unorderedness if  
# the hash iteration. it’s okay for some purposed though  
#  
a = Arrayfields.new :key =\> :value, :a =\> :b  
p a.fields #=\> [:key, :a]  
p a.values #=\> [:value, :b]  
#  
# lists of pairs get flattened - the result simply has to be  
evenly numbered  
#  
a = Arrayfields.new [[:key, :value], [:a, :b]]  
p a.fields #=\> [:key, :a]  
p a.values #=\> [:value, :b]  
p a.pairs #=\>  
[[:key, :value], [:a, :b]]

~ \> ruby sample/d.rb

```
 [:key, :a]
 [:value, :b]
 [:key, :a]
 [:value, :b]
 [:key, :a]
 [:value, :b]
 [[:key, :value], [:a, :b]]

```

\<========\< sample/e.rb \>========\>

~ \> cat sample/e.rb

```
 require 'arrayfields'

 Entry = Array.struct :path, :stat

 entry = Entry[File.basename( __FILE__ ), File.stat( __FILE__ )]
 p entry[:path] #=> "e.rb"
 p entry.path #=> "e.rb"

 entry.path = 'foo'
 p entry[:path] #=> "foo"
 p entry.path #=> "foo"

 entry.path 'bar' # getter acts as setter without args
 p entry['path'] #=> "bar"
 p entry.path #=> "bar"

```

~ \> ruby sample/e.rb

```
 "e.rb"
 "e.rb"
 "foo"
 "foo"
 "bar"
 "bar"

```

AUTHOR  
removed\_email\_address@domain.invalid

HISTORY  
4.1.0:  
- improved Array.struct method, see sample/e.rb

enjoy.

a @ [http://drawohara.com/](http://drawohara.com/)

---

<div class="post-metadata">

**Author:** ![ara.t.howard](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/a8b319/32.png) [@ara.t.howard](https://www.ruby-forum.com/u/ara.t.howard)\
**Post date:** [September 18, 2007, 4:42pm UTC](https://www.ruby-forum.com/t/arrayfields-4-1-0/114772/2 "2007-09-18T16:42:29Z")

</div>

Hi ara (Ara, a, … which is the best salutation?),

There appears to be an incompatibility between arrayfields and active  
record dynamic finders.

I’ve filed a bug report here:

[http://rubyforge.org/tracker/index.php?func=detail&aid=14040&group\_id=1024&atid=4025](http://rubyforge.org/tracker/index.php?func=detail&aid=14040&group_id=1024&atid=4025)

but I’m also posting it here to get a wider audience.

I’m using rails 1.2.3. After loading arrayfields 4.1.0 the active  
record dynamic finders “find\_by\_ …” are broken.

Here’s a simple test showing the dynamic finder working, requiring  
arrayfields, and then the dynamic finder stops working.

$ script/console  
Loading development environment.

> > OtmlFile.find\_by\_path(“…/…/concord/otrunk-examples/BasicExamples/basic\_drawing.otml”)  
> > =\> #\<OtmlFile:0x330ebf4 @attributes={“name”=\>“basic\_drawing.otml”,  
> > “id”=\>“1”,  
> > “path”=\>“…/…/concord/otrunk-examples/BasicExamples/basic\_drawing.otml”}\>  
> > require ‘arrayfields’  
> > =\> [“PseudoHash”, “Arrayfields”, “Pseudohash”, “Fieldable”,  
> > “FieldedArray”, “ArrayFields”, “Fieldedarray”]
> > 
> > OtmlFile.find\_by\_path(“…/…/concord/otrunk-examples/BasicExamples/basic\_drawing.otml”)  
> > ArgumentError: not inject-able  
> > from  
> > /usr/local/lib/ruby/gems/1.8/gems/arrayfields-4.1.0/lib/arrayfields.rb:28:in  
> > `initialize' from /usr/local/lib/ruby/gems/1.8/gems/arrayfields-4.1.0/lib/arrayfields.rb:16:in `new’  
> > from  
> > /usr/local/lib/ruby/gems/1.8/gems/arrayfields-4.1.0/lib/arrayfields.rb:16:in  
> > `new' from /usr/local/lib/ruby/gems/1.8/gems/arrayfields-4.1.0/lib/arrayfields.rb:286:in `fields=’  
> > from  
> > /usr/local/lib/ruby/gems/1.8/gems/arrayfields-4.1.0/lib/arrayfields.rb:305:in  
> > `dup' from /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/base.rb:1426:in `replace\_bind\_variables’  
> > from  
> > /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active\_record/base.rb:1405:in  
> > `sanitize_sql_hash' from /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/base.rb:1388:in `sanitize\_sql’  
> > from  
> > /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active\_record/base.rb:1163:in  
> > `add_conditions!' from /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/base.rb:1096:in `construct\_finder\_sql’  
> > from  
> > /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active\_record/base.rb:997:in  
> > `find_every' from /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/base.rb:991:in `find\_initial’  
> > from  
> > /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active\_record/base.rb:1204:in  
> > `send' from /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/base.rb:1204:in `method\_missing’  
> > from  
> > /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active\_support/deprecation.rb:44:in  
> > `silence' from /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/base.rb:1204:in `method\_missing’  
> > from (irb):3\>\>

---

<div class="post-metadata">

**Author:** ![ara.t.howard](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/a8b319/32.png) [@ara.t.howard](https://www.ruby-forum.com/u/ara.t.howard)\
**Post date:** [September 18, 2007, 9:29pm UTC](https://www.ruby-forum.com/t/arrayfields-4-1-0/114772/3 "2007-09-18T21:29:45Z")

</div>

At 11:41 PM +0900 9/18/07, Stephen B. wrote:

> There appears to be an incompatibility between arrayfields and active record dynamic finders.
> 
> I’ve filed a bug report here:
> 
> [http://rubyforge.org/tracker/index.php?func=detail&aid=14040&group\_id=1024&atid=4025](http://rubyforge.org/tracker/index.php?func=detail&aid=14040&group_id=1024&atid=4025)

Here’s a much simpler way to generate the problem without rails.

$ irb  
irb(main):001:0\> a = [1,2,3]  
=\> [1, 2, 3]  
irb(main):002:0\> a.dup  
=\> [1, 2, 3]  
irb(main):003:0\> require ‘arrayfields’  
=\> true  
irb(main):004:0\> a.dup  
ArgumentError: not inject-able  
from  
/usr/local/lib/ruby/gems/1.8/gems/arrayfields-4.1.0/lib/arrayfields.rb:28:in  
`initialize' from /usr/local/lib/ruby/gems/1.8/gems/arrayfields-4.1.0/lib/arrayfields.rb:16:in `new’  
from  
/usr/local/lib/ruby/gems/1.8/gems/arrayfields-4.1.0/lib/arrayfields.rb:16:in  
`new' from /usr/local/lib/ruby/gems/1.8/gems/arrayfields-4.1.0/lib/arrayfields.rb:286:in `fields=’  
from  
/usr/local/lib/ruby/gems/1.8/gems/arrayfields-4.1.0/lib/arrayfields.rb:305:in  
`dup’  
from (irb):4

---

<div class="post-metadata">

**Author:** ![ara.t.howard](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/a8b319/32.png) [@ara.t.howard](https://www.ruby-forum.com/u/ara.t.howard)\
**Post date:** [September 18, 2007, 11:02pm UTC](https://www.ruby-forum.com/t/arrayfields-4-1-0/114772/4 "2007-09-18T23:02:59Z")

</div>

On Sep 18, 2007, at 1:27 PM, Stephen B. wrote:

> lib/arrayfields.rb:28:in `initialize' from /usr/local/lib/ruby/gems/1.8/gems/arrayfields-4.1.0/ lib/arrayfields.rb:16:in `new’  
> from /usr/local/lib/ruby/gems/1.8/gems/arrayfields-4.1.0/  
> lib/arrayfields.rb:16:in `new' from /usr/local/lib/ruby/gems/1.8/gems/arrayfields-4.1.0/ lib/arrayfields.rb:286:in `fields=’  
> from /usr/local/lib/ruby/gems/1.8/gems/arrayfields-4.1.0/  
> lib/arrayfields.rb:305:in `dup’  
> from (irb):4

yeah thanks. it was a stupid bug on my part. 4.2.0 and 4.3.0 both  
address the fix. thanks again.

a @ [http://drawohara.com/](http://drawohara.com/)

---

<div class="post-metadata">

**Author:** ![ara.t.howard](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/a8b319/32.png) [@ara.t.howard](https://www.ruby-forum.com/u/ara.t.howard)\
**Post date:** [September 18, 2007, 9:42pm UTC](https://www.ruby-forum.com/t/arrayfields-4-1-0/114772/5 "2007-09-18T21:42:47Z")

</div>

On Sep 18, 2007, at 8:41 AM, Stephen B. wrote:

> > > OtmlFile.find\_by\_path(“…/…/concord/otrunk-examples/  
> > > BasicExamples/basic\_drawing.otml”)

thanks.

cfp:~ \> rails test --database=sqlite3 \> /dev/null 2\>&1 && cd test

cfp:~/test \> ./script/console  
Loading development environment.

> > c = ActiveRecord::Base.connection  
> > =\> #\<ActiveRecord::ConnectionAdapters::SQLite3Adapter:0x345227c  
> > @connection=#\<SQLite3::Database:0x3462c44  
> > @statement\_factory=SQLite3::Statement, @results\_as\_hash=true,  
> > @transaction\_active=false, @handle=#SWIG::TYPE\_p\_sqlite3:0x34522a4,  
> > @translator=nil, @driver=#\<SQLite3::Driver::Native::Driver:0x345236c  
> > @callback\_data={}, @trace={}, @busy\_handler={}, @authorizer={}\>,  
> > @type\_translation=false, @closed=false\>, @last\_verification=0,  
> > @runtime=0, @logger=#\<Logger:0x367331c @logdev=#\<Logger::LogDevice:  
> > 0x3673164 @filename=“script/…/config/…/config/…/log/  
> > development.log”, @mutex=#\<Logger::LogDevice::LogDeviceMutex:  
> > 0x3673074 @mon\_owner=nil, @mon\_waiting\_queue=[], @mon\_entering\_queue=  
> > [], @mon\_count=0\>, @dev=#\<File:script/…/config/…/config/…/log/  
> > development.log\>, @shift\_size=1048576, @shift\_age=0\>, @formatter=nil,  
> > @default\_formatter=#\<Logger::Formatter:0x36731f0  
> > @datetime\_format=nil\>, @level=0, @progname=nil\>\>

> > c.execute ’ create table foos( a text, b text ) ’  
> > =\> []

> > class Foo \< ActiveRecord::Base; end  
> > =\> nil

> > Foo.create :a =\> ‘4’, :b =\> ‘2’  
> > =\> #\<Foo:0x344a3c4 @errors=#\<ActiveRecord::Errors:0x3447b10 @errors=  
> > {}, @base=#\<Foo:0x344a3c4 …\>\>, @attributes={“a”=\>“4”, “b”=\>“2”,  
> > “id”=\>1}, @new\_record=false\>

> > Foo.find\_by\_a ‘4’  
> > =\> #\<Foo:0x3443ec0 @attributes={“a”=\>“4”, “b”=\>“2”}\>

> > Foo.find\_by\_b ‘2’  
> > =\> #\<Foo:0x34419a4 @attributes={“a”=\>“4”, “b”=\>“2”}\>

> > require ‘arrayfields’  
> > =\> [“ArrayFields”, “Fieldedarray”, “Arrayfields”, “PseudoHash”,  
> > “Fieldable”, “Pseudohash”, “FieldedArray”]

> > p Arrayfields.version  
> > “4.2.0”  
> > =\> nil

> > Foo.find\_by\_a ‘4’  
> > =\> #\<Foo:0x342bfb4 @attributes={“a”=\>“4”, “b”=\>“2”}\>

> > Foo.find\_by\_b ‘2’  
> > =\> #\<Foo:0x3429a98 @attributes={“a”=\>“4”, “b”=\>“2”}\>

on rubyforge now.

a @ [http://drawohara.com/](http://drawohara.com/)

---

<div class="post-metadata">

**Author:** ![ara.t.howard](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/a8b319/32.png) [@ara.t.howard](https://www.ruby-forum.com/u/ara.t.howard)\
**Post date:** [September 25, 2007, 11:04pm UTC](https://www.ruby-forum.com/t/arrayfields-4-1-0/114772/6 "2007-09-25T23:04:49Z")

</div>

On Sep 17, 2007, at 4:49 PM, Jeremy H. wrote:

> 

thanks.

cfp:~/src/ruby/arrayfields/arrayfields-4.2.0 \> cat a.rb  
require ‘rubygems’  
require ‘arrayfields’  
puts “ruby version : #{RUBY\_VERSION}”  
puts “gems version : #{Gem::RubyGemsVersion}”  
puts “arrayfields version : #{ArrayFields::VERSION}”  
require ‘rake’  
puts 42

cfp:~/src/ruby/arrayfields/arrayfields-4.2.0 \> ruby a.rb  
ruby version : 1.8.6  
gems version : 0.9.2  
arrayfields version : 4.2.0  
42

on rubyforge now.

a @ [http://drawohara.com/](http://drawohara.com/)

---

<div class="post-metadata">

**Author:** ![ara.t.howard](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/a8b319/32.png) [@ara.t.howard](https://www.ruby-forum.com/u/ara.t.howard)\
**Post date:** [September 25, 2007, 11:05pm UTC](https://www.ruby-forum.com/t/arrayfields-4-1-0/114772/7 "2007-09-25T23:05:33Z")

</div>

On Sep 14, 2007, at 8:56 PM, ara.t.howard wrote:

> ```
> p a.at('one') #=> 1
> p a.values_at('zero', 'two') #=> [0, 2]
> #
> # assigmnet is allowed
> #
> a['zero'] = 42
> p a['zero'] #=> 0
> 
> ```

Surely, the last line above contains a typo. Shouldn’t it be

> ```
> p a['zero'] #=> 42
> 
> ```

Regards, Morton

---

<div class="post-metadata">

**Author:** ![ara.t.howard](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/a8b319/32.png) [@ara.t.howard](https://www.ruby-forum.com/u/ara.t.howard)\
**Post date:** [September 25, 2007, 11:05pm UTC](https://www.ruby-forum.com/t/arrayfields-4-1-0/114772/8 "2007-09-25T23:05:35Z")

</div>

On Sat, Sep 15, 2007 at 01:24:22PM +0900, ara.t.howard wrote:

> therein lies the problem with writing documentation 😉
> 
> if you check most of my new stuff the examples generate the README  
> for exactly the reason that i have fat fingers 😉
> 
> thx.

Bug for you…

```
% cat af-bug.rb
require 'rubygems'
require 'arrayfields'
puts "ruby version : #{RUBY_VERSION}"
puts "gems version : #{Gem::RubyGemsVersion}"
puts "arrayfields version : #{ArrayFields::VERSION}"
require 'rake'
puts 42

% ruby af-bug.rb
ruby version : 1.8.6
gems version : 0.9.2
arrayfields version : 4.1.0
/opt/local/lib/ruby/gems/1.8/gems/arrayfields-4.1.0/lib/arrayfields.rb:28:in 

```

`initialize': <nil> not inject-able (ArgumentError) from /opt/local/lib/ruby/gems/1.8/gems/arrayfields-4.1.0/lib/arrayfields.rb:16:in`new’  
from  
/opt/local/lib/ruby/gems/1.8/gems/arrayfields-4.1.0/lib/arrayfields.rb:16:in  
`new' from /opt/local/lib/ruby/gems/1.8/gems/arrayfields-4.1.0/lib/arrayfields.rb:286:in`fields=’  
from  
/opt/local/lib/ruby/gems/1.8/gems/arrayfields-4.1.0/lib/arrayfields.rb:305:in  
`dup' from /opt/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1304 from /opt/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:32:in`gem\_original\_require’  
from  
/opt/local/lib/ruby/site\_ruby/1.8/rubygems/custom\_require.rb:32:in  
`require’  
from af-bug.rb:6

Order matters, require ‘rake’ before arrayfields and there is no error.

enjoy,

-jeremy

---

<div class="post-metadata">

**Author:** ![ara.t.howard](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/a8b319/32.png) [@ara.t.howard](https://www.ruby-forum.com/u/ara.t.howard)\
**Post date:** [September 25, 2007, 11:07pm UTC](https://www.ruby-forum.com/t/arrayfields-4-1-0/114772/9 "2007-09-25T23:07:14Z")

</div>

On Sep 14, 2007, at 9:36 PM, Morton G. wrote:

> Surely, the last line above contains a typo. Shouldn’t it be
> 
> > ```
> > p a['zero'] #=> 42
> > 
> > ```
> 
> Regards, Morton

therein lies the problem with writing documentation 😉

if you check most of my new stuff the examples generate the README  
for exactly the reason that i have fat fingers 😉

thx.

a @ [http://drawohara.com/](http://drawohara.com/)