# One-Liners (#113)

**URL:** <https://www.ruby-forum.com/t/one-liners-113/85062>\
**Category:** Ruby\
**Created:** [February 9, 2007, 6:01pm UTC](https://www.ruby-forum.com/t/one-liners-113/85062 "2007-02-09T18:01:04Z")\
**Posts on this page:** 20\
**Page:** 1

<div class="post-metadata">

**Author:** ![bbazzarrakk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bbazzarrakk](https://www.ruby-forum.com/u/bbazzarrakk)\
**Post date:** [February 9, 2007, 6:01pm UTC](https://www.ruby-forum.com/t/one-liners-113/85062/1 "2007-02-09T18:01:04Z")

</div>

The three rules of Ruby Q.:

1. Please do not post any solutions or spoiler discussion for this quiz  
until  
48 hours have passed from the time on this message.

2. Support Ruby Q. by submitting ideas as often as you can:

[http://www.rubyquiz.com/](http://www.rubyquiz.com/)

1. Enjoy!

Suggestion: A [QUIZ] in the subject of emails about the problem helps  
everyone  
on Ruby T. follow the discussion. Please reply to the original quiz  
message,  
if you can.

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

This week’s Ruby Q. is in pop quiz format. For each of the scenarios  
below,  
send in a one line (80 characters or less) solution that performs the  
task. You  
may use any legal Ruby syntax including require statements and  
semicolons, but  
the goal in finesse more than golfing.

Any input described in the problem is in a local variable called quiz.  
Assigning to this variable is assumed to have happened earlier in the  
program  
and is not part of your submitted solution.

Your line just needs to evaluate to the expected result. You do not  
have to  
store the result in a variable or create any output.

Any edge cases not covered by the provided examples are left to your  
best  
judgement.

- Given a Numeric, provide a String representation with commas inserted  
between  
each set of three digits in front of the decimal. For example,  
1999995.99  
should become “1,999,995.99”.

- Given a nested Array of Arrays, perform a flatten()-like operation  
that  
removes only the top level of nesting. For example, [1, [2, [3]]] would  
become  
[1, 2, [3]].

- Shuffle the contents of a provided Array.

- Given a Ruby class name in String form (like  
“GhostWheel::Expression::LookAhead”), fetch the actual class object.

- Insert newlines into a paragraph of prose (provided in a String) so  
lines will  
wrap at 40 characters.

- Given an Array of String words, build an Array of only those words  
that are  
anagrams of the first word in the Array.

- Convert a ThinkGeek t-shirt slogan (in String form) into a binary  
representation (still a String). For example, the popular shirt “you  
are dumb”  
is actually printed as:

- Provided with an open File object, select a random line of content.

- Given a wondrous number Integer, produce the sequence (in an Array).  
A  
wondrous number is a number that eventually reaches one, if you apply  
the  
following rules to build a sequence from it. If the current number in  
the  
sequence is even, the next number is that number divided by two. When  
the  
current number is odd, multiply that number by three and add one to get  
the next  
number in the sequence. Therefore, if we start with the wondrous number  
15, the  
sequence is [15, 46, 23, 70, 35, 106, 53, 160, 80, 40, 20, 10, 5, 16, 8,  
4, 2,  
1].

- Convert an Array of objects to nested Hashes such that %w[one two  
three four  
five] becomes {“one” =\> {“two” =\> {“three” =\> {“four” =\> “five”}}}}.

---

<div class="post-metadata">

**Author:** ![bbazzarrakk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bbazzarrakk](https://www.ruby-forum.com/u/bbazzarrakk)\
**Post date:** [February 9, 2007, 8:41pm UTC](https://www.ruby-forum.com/t/one-liners-113/85062/2 "2007-02-09T20:41:23Z")

</div>

On 2/9/07, Ruby Q. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> The three rules of Ruby Q.:

Sounds like fun,  
Now the stupid question of the day: will a comment before the line be a  
problem for your tools, I guess they are counting 😉

Cheers  
Robert

---

<div class="post-metadata">

**Author:** ![bbazzarrakk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bbazzarrakk](https://www.ruby-forum.com/u/bbazzarrakk)\
**Post date:** [February 9, 2007, 8:47pm UTC](https://www.ruby-forum.com/t/one-liners-113/85062/3 "2007-02-09T20:47:23Z")

</div>

On Feb 9, 2007, at 1:40 PM, Robert D. wrote:

> On 2/9/07, Ruby Q. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:
> 
> > The three rules of Ruby Q.:
> 
> Sounds like fun,  
> Now the stupid question of the day: will a comment before the line  
> be a  
> problem for your tools, I guess they are counting 😉

I don’t have any tools. Someone should build a test suite and post  
it though, if they feel motivated to do so.

For my solutions though, I put the questions as comments before each  
solution.

James Edward G. II

---

<div class="post-metadata">

**Author:** ![bbazzarrakk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bbazzarrakk](https://www.ruby-forum.com/u/bbazzarrakk)\
**Post date:** [February 9, 2007, 9:43pm UTC](https://www.ruby-forum.com/t/one-liners-113/85062/4 "2007-02-09T21:43:31Z")

</div>

On 2/9/07, James Edward G. II [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> > Now the stupid question of the day: will a comment before the line  
> > be a  
> > problem for your tools, I guess they are counting 😉
> 
> I don’t have any tools. Someone should build a test suite and post  
> it though, if they feel motivated to do so.
> 
> For my solutions though, I put the questions as comments before each  
> solution.

You read (Past Tense) me perfectly 😉  
Thx

Robert

---

<div class="post-metadata">

**Author:** ![bbazzarrakk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bbazzarrakk](https://www.ruby-forum.com/u/bbazzarrakk)\
**Post date:** [February 9, 2007, 10:01pm UTC](https://www.ruby-forum.com/t/one-liners-113/85062/5 "2007-02-09T22:01:35Z")

</div>

So, does the quiz variable that we’re getting have to remain unmodified,  
or  
does it matter?

---

<div class="post-metadata">

**Author:** ![bbazzarrakk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bbazzarrakk](https://www.ruby-forum.com/u/bbazzarrakk)\
**Post date:** [February 9, 2007, 10:06pm UTC](https://www.ruby-forum.com/t/one-liners-113/85062/6 "2007-02-09T22:06:37Z")

</div>

On Feb 9, 2007, at 3:01 PM, Luke I. wrote:

> So, does the quiz variable that we’re getting have to remain  
> unmodified, or  
> does it matter?

Either way is fine with me.

James Edward G. II

---

<div class="post-metadata">

**Author:** ![bbazzarrakk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bbazzarrakk](https://www.ruby-forum.com/u/bbazzarrakk)\
**Post date:** [February 9, 2007, 10:14pm UTC](https://www.ruby-forum.com/t/one-liners-113/85062/7 "2007-02-09T22:14:41Z")

</div>

On 2/9/07, Luke I. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> > current number is odd, multiply that number by three and add one to get  
> > the input is guaranteed to be wondrous, and we therefore don’t need to  
> > check  
> > it, or does the solution need to include a check to make sure that it is  
> > indeed a wondrous number?

Never mind.

---

<div class="post-metadata">

**Author:** ![bbazzarrakk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bbazzarrakk](https://www.ruby-forum.com/u/bbazzarrakk)\
**Post date:** [February 9, 2007, 10:15pm UTC](https://www.ruby-forum.com/t/one-liners-113/85062/8 "2007-02-09T22:15:42Z")

</div>

On Feb 9, 2007, at 3:10 PM, Luke I. wrote:

> > to get  
> > One final question: you say “given a wondrous number”… does this  
> > mean that  
> > the input is guaranteed to be wondrous, and we therefore don’t need  
> > to check  
> > it…

Correct.

James Edward G. II

---

<div class="post-metadata">

**Author:** ![bbazzarrakk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bbazzarrakk](https://www.ruby-forum.com/u/bbazzarrakk)\
**Post date:** [February 9, 2007, 10:11pm UTC](https://www.ruby-forum.com/t/one-liners-113/85062/9 "2007-02-09T22:11:40Z")

</div>

> 4, 2,  
> 1].

One final question: you say “given a wondrous number”… does this mean  
that  
the input is guaranteed to be wondrous, and we therefore don’t need to  
check  
it, or does the solution need to include a check to make sure that it is  
indeed a wondrous number?

---

<div class="post-metadata">

**Author:** ![bbazzarrakk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bbazzarrakk](https://www.ruby-forum.com/u/bbazzarrakk)\
**Post date:** [February 9, 2007, 10:27pm UTC](https://www.ruby-forum.com/t/one-liners-113/85062/10 "2007-02-09T22:27:45Z")

</div>

On Feb 9, 2007, at 3:19 PM, Jamie M. wrote:

> On 2/9/07, James Edward G. II [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:
> 
> > Someone should build a test suite and post  
> > it though, if they feel motivated to do so.
> 
> Okay. The only one I’m taking significant liberties with is the  
> random-line-from-a-file - the test is expecting that the contents of  
> the file be loaded using File#read…

What if it’s a file too big to read into memory? 😉

James Edward G. II

---

<div class="post-metadata">

**Author:** ![bbazzarrakk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bbazzarrakk](https://www.ruby-forum.com/u/bbazzarrakk)\
**Post date:** [February 9, 2007, 10:20pm UTC](https://www.ruby-forum.com/t/one-liners-113/85062/11 "2007-02-09T22:20:44Z")

</div>

On 2/9/07, James Edward G. II [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> Someone should build a test suite and post  
> it though, if they feel motivated to do so.

Okay. The only one I’m taking significant liberties with is the  
random-line-from-a-file - the test is expecting that the contents of  
the file be loaded using File#read, and uses OpenStruct to provide a  
test stub with that functionality. Other than that, these tests are a  
pretty direct translation from the initial description. Method stubs  
for the implementation are also provided.

require ‘test/unit’  
require ‘ostruct’

class OneLiner  
class \<\< self  
def commaize(number)  
end

```
def flatten_once(ary)
end

def shuffle(ary)
end

def get_class(name)
end

def wrap_text(paragraph)
end

def find_anagrams(words)
end

def binarize(slogan)
end

def random_line(file)
end

def wondrous_sequence(n)
end

def nested_hash(ary)
end

```

end  
end

class TestOneLiner \< Test::Unit::TestCase

# Given a Numeric, provide a String representation with commas

inserted

# between each set of three digits in front of the decimal. For

example,

# 1999995.99 should become “1,999,995.99”.

def test\_commaize  
assert\_equal “1,999,995.99”, OneLiner.commaize(1999995.99)  
end

# Given a nested Array of Arrays, perform a flatten()-like operation

that

# removes only the top level of nesting. For example, [1, [2, [3]]]

would

# become [1, 2, [3]].

def test\_flatten\_once  
ary = [1, [2, [3, 4]]]  
flatter\_ary = [1, 2, [3, 4]]  
assert\_equal flatter\_ary, OneLiner.flatten\_once(ary)  
end

# Shuffle the contents of a provided Array.

def test\_shuffle  
ary = [3,1,4,1,5,9]  
shuffled\_ary = OneLiner.shuffle(ary)  
assert\_not\_equal ary, shuffled\_ary  
assert\_equal ary.sort, shuffled\_ary.sort  
end

# Given a Ruby class name in String form (like

# “GhostWheel::Expression::LookAhead”), fetch the actual class object.

def test\_get\_class  
assert\_equal Test::Unit::TestCase,  
OneLiner.get\_class(“Test::Unit::TestCase”)  
end

# Insert newlines into a paragraph of prose (provided in a String) so

# lines will wrap at 40 characters.

def test\_wrap\_text  
wrapped = "Insert newlines into a paragraph of " + “\n” +  
"prose (provided in a String) so lines " + “\n” +  
“will wrap at 40 characters.”  
paragraph = "Insert newlines into a paragraph of " +  
"prose (provided in a String) so lines " +  
“will wrap at 40 characters.”  
assert\_equal wrapped, OneLiner.wrap\_text(paragraph)  
end

# Given an Array of String words, build an Array of only those words

that

# are anagrams of the first word in the Array.

def test\_find\_anagrams  
anagrams = %w(cat act)  
assert\_equal anagrams, OneLiner.find\_anagrams(%w(tac bat cat rat  
act))  
end

# Convert a ThinkGeek t-shirt slogan (in String form) into a binary

# representation (still a String). For example, the popular shirt

# “you are dumb” is actually printed as:

```
     # 111100111011111110101
     # 110000111100101100101
     # 1100100111010111011011100010

```

def test\_binarize  
output = “111100111011111110101” + “\n” +  
“110000111100101100101” + “\n” +  
“1100100111010111011011100010”  
assert\_equal output, OneLiner.binarize(“you are dumb”)  
end

# Provided with an open File object, select a random line of content.

# 

# NOTE: This test assumes you’re using File#read to get the string

data

# from the file - if doing otherwise, update the test?

def test\_random\_line  
file = OpenStruct.new(:read =\> “development:  
adapter: mysql  
database: redvase\_development  
host: localhost  
username: root  
password:”)  
lines = file.read.split(“\n”)  
line = OneLiner.random\_line(file)  
assert\_equal true, lines.include?(line)  
end

# Given a wondrous number Integer, produce the sequence (in an Array).

A

# wondrous number is a number that eventually reaches one, if you

apply

# the following rules to build a sequence from it. If the current

number

# in the sequence is even, the next number is that number divided by

two.

# When the current number is odd, multiply that number by three and

add

# one to get the next number in the sequence. Therefore, if we start

with

# the wondrous number 15, the sequence is [15, 46, 23, 70, 35, 106,

53,

# 160, 80, 40, 20, 10, 5, 16, 8, 4, 2, 1].

def test\_wondrous\_sequence  
seq = [23, 70, 35, 106, 53, 160, 80, 40, 20, 10, 5, 16, 8, 4, 2, 1]  
assert\_equal seq, OneLiner.wondrous\_sequence(23)  
end

# Convert an Array of objects to nested Hashes such that %w[one two

three

# four five] becomes {“one” =\> {“two” =\> {“three” =\> {“four” =\>

“five”}}}}.  
def test\_nested\_hash  
hash = {:o =\> {:t =\> {:t =\> {:f =\> :f}}}}  
assert\_equal hash, OneLiner.nested\_hash([:o, :t, :t, :f, :f])  
end  
end

---

<div class="post-metadata">

**Author:** ![bbazzarrakk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bbazzarrakk](https://www.ruby-forum.com/u/bbazzarrakk)\
**Post date:** [February 9, 2007, 11:10pm UTC](https://www.ruby-forum.com/t/one-liners-113/85062/12 "2007-02-09T23:10:55Z")

</div>

[snip]

> # Given an Array of String words, build an Array of only those words that
> 
> # are anagrams of the first word in the Array.
> 
> def test\_find\_anagrams  
> anagrams = %w(cat act)  
> assert\_equal anagrams, OneLiner.find\_anagrams(%w(tac bat cat rat act))  
> end  
> [snip]

I changed anagrams to %w(tac cat act). I’m the sort of person that  
thinks a word is an anagram of itself (although, I have a feeling  
“tac” isn’t a word).

---

<div class="post-metadata">

**Author:** ![bbazzarrakk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bbazzarrakk](https://www.ruby-forum.com/u/bbazzarrakk)\
**Post date:** [February 9, 2007, 10:56pm UTC](https://www.ruby-forum.com/t/one-liners-113/85062/13 "2007-02-09T22:56:53Z")

</div>

On Feb 9, 10:00 am, Ruby Q. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> - Given a wondrous number Integer, produce the sequence (in an Array). A  
> wondrous number is a number that eventually reaches one, if you apply the  
> following rules to build a sequence from it. If the current number in the  
> sequence is even, the next number is that number divided by two. When the  
> current number is odd, multiply that number by three and add one to get the next  
> number in the sequence. Therefore, if we start with the wondrous number 15, the  
> sequence is [15, 46, 23, 70, 35, 106, 53, 160, 80, 40, 20, 10, 5, 16, 8, 4, 2,  
> 1].

Here are a few more test cases, both to help others and to be sure  
that mine is right:

def test\_wondrous( str )  
maps = [  
[1, [1]],  
[3,[3,10,5,16,8,4,2,1]],  
[5,[5,16,8,4,2,1]],  
[8,[8,4,2,1]],  
[15,[15,46,23,70,35,106,53,160,80,40,20,10,5,16,8,4,2,1]],  
[31,  
[31,94,47,142,71,214,107,322,161,484,242,121,364,182,91,274,137,412,206,103,310,155,466,233,700,350,175,526,263,790,395,1186,593,1780,890,445,1336,668,334,167,502,251,754,377,1132,566,283,850,425,1276,638,319,958,479,1438,719,2158,1079,3238,1619,4858,2429,7288,3644,1822,911,2734,1367,4102,2051,6154,3077,9232,4616,2308,1154,577,1732,866,433,1300,650,325,976,488,244,122,61,184,92,46,23,70,35,106,53,160,80,40,20,10,5,16,8,4,2,1]]  
]  
raise “Solution too long (#{str.length} characters)” unless  
str.length \<= 80  
maps.each{ |pair|  
quiz = pair[0]  
expected = pair[1]  
output = eval( str )  
unless expected==output  
raise “quiz=#{quiz}; expected #{expected.inspect}, got  
#{output.inspect}”  
end  
}  
end

---

<div class="post-metadata">

**Author:** ![bbazzarrakk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bbazzarrakk](https://www.ruby-forum.com/u/bbazzarrakk)\
**Post date:** [February 9, 2007, 11:17pm UTC](https://www.ruby-forum.com/t/one-liners-113/85062/14 "2007-02-09T23:17:56Z")

</div>

On 2/9/07, Chris S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> thinks a word is an anagram of itself (although, I have a feeling  
> “tac” isn’t a word).

Neither did I, I was just looking for an easy test. And yet, lo and  
behold:

[http://cancerweb.ncl.ac.uk/cgi-bin/omd?query=tac](http://cancerweb.ncl.ac.uk/cgi-bin/omd?query=tac)  
A kind of customary payment by a tenant; a word used in old records.  
Origin: Cf. Tack, 4.  
Source: Websters Dictionary

---

<div class="post-metadata">

**Author:** ![bbazzarrakk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bbazzarrakk](https://www.ruby-forum.com/u/bbazzarrakk)\
**Post date:** [February 9, 2007, 11:15pm UTC](https://www.ruby-forum.com/t/one-liners-113/85062/15 "2007-02-09T23:15:56Z")

</div>

On Feb 9, 10:00 am, Ruby Q. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> - Given a Numeric, provide a String representation with commas inserted between  
> each set of three digits in front of the decimal. For example, 1999995.99  
> should become “1,999,995.99”.

More test cases:  
def test\_commify( str )  
maps = [  
[1, “1”],  
[-1, “-1”],  
[0.001, “0.001”],  
[-0.001, “-0.001”],  
[999, “999”],  
[-999, “-999”],  
[999.1, “999.1”],  
[-999.1, “-999.1”],  
[999.12, “999.12”],  
[-999.12, “-999.12”],  
[999.123, “999.123”],  
[-999.123, “-999.123”],  
[9999, “9,999”],  
[-9999, “-9,999”],  
[9999.1, “9,999.1”],  
[-9999.1, “-9,999.1”],  
[9999.12, “9,999.12”],  
[-9999.12, “-9,999.12”],  
[9999.123, “9,999.123”],  
[-9999.123, “-9,999.123”],  
[12, “12”],  
[123, “123”],  
[1234, “1,234”],  
[12345, “12,345”],  
[123456, “123,456”],  
[1234567, “1,234,567”],  
[12345678, “12,345,678”],  
[-12, “-12”],  
[-123, “-123”],  
[-1234, “-1,234”],  
[-12345, “-12,345”],  
[-123456, “-123,456”],  
[-1234567, “-1,234,567”],  
[-12345678, “-12,345,678”]  
]  
raise “Solution too long (#{str.length} characters)” unless  
str.length \<= 80  
maps.each{ |pair|  
quiz = pair[0]  
expected = pair[1]  
output = eval( str )

```
unless expected==output
  raise "quiz=#{quiz}; expected #{expected.inspect}, got

```

#{output.inspect}"  
end  
}  
end

---

<div class="post-metadata">

**Author:** ![bbazzarrakk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bbazzarrakk](https://www.ruby-forum.com/u/bbazzarrakk)\
**Post date:** [February 9, 2007, 11:45pm UTC](https://www.ruby-forum.com/t/one-liners-113/85062/16 "2007-02-09T23:45:59Z")

</div>

On Feb 9, 10:00 am, Ruby Q. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> - Given a nested Array of Arrays, perform a flatten()-like operation that  
> removes only the top level of nesting. For example, [1, [2, [3]]] would become  
> [1, 2, [3]].

Yet more test cases (and a new way that I’m testing them). Used like:  
s = ‘your 80 char solution here’  
test\_solution( :flatten\_once, s )

def test\_solution( map\_set, str )  
raise “Solution too long (#{str.length} chars)” unless str.length \<=  
80  
maps = MAPS[map\_set]  
maps.each{ |pair|  
quiz = pair[0]  
expected = pair[1]  
output = eval( str )

```
unless expected==output
  raise "quiz=#{quiz}; expected #{expected.inspect}, got

```

#{output.inspect}"  
end  
}  
end

MAPS = {  
:commify =\> [  
[1, “1”],  
[-1, “-1”],  
[0.001, “0.001”],  
[-0.001, “-0.001”],  
[999, “999”],  
[-999, “-999”],  
[999.1, “999.1”],  
[-999.1, “-999.1”],  
[999.12, “999.12”],  
[-999.12, “-999.12”],  
[999.123, “999.123”],  
[-999.123, “-999.123”],  
[9999, “9,999”],  
[-9999, “-9,999”],  
[9999.1, “9,999.1”],  
[-9999.1, “-9,999.1”],  
[9999.12, “9,999.12”],  
[-9999.12, “-9,999.12”],  
[9999.123, “9,999.123”],  
[-9999.123, “-9,999.123”],  
[12, “12”],  
[123, “123”],  
[1234, “1,234”],  
[12345, “12,345”],  
[123456, “123,456”],  
[1234567, “1,234,567”],  
[12345678, “12,345,678”],  
[-12, “-12”],  
[-123, “-123”],  
[-1234, “-1,234”],  
[-12345, “-12,345”],  
[-123456, “-123,456”],  
[-1234567, “-1,234,567”],  
[-12345678, “-12,345,678”]  
],

:flatten\_once =\> [  
[[], [] ],  
[[1], [1] ],  
[[1,2], [1,2] ],  
[[1,[2]], [1,2] ],  
[[[1],2], [1,2] ],  
[[[1,2]], [1,2] ],  
[[1,2,3], [1,2,3] ],  
[[1,[2,3]], [1,2,3] ],  
[[[1,2,3]], [1,2,3] ],  
[[1, [2, [3]]], [1, 2, [3]] ],  
[[1, [[2], 3]], [1, [2], 3] ],  
[[1,[2,[3,[4]]]], [1, 2, [3,[4]]] ],  
[[[[[[[6]]]]]], [[[[[6]]]]] ]  
],

:wondrous =\> [  
[1, [1]],  
[3,[3,10,5,16,8,4,2,1]],  
[5,[5,16,8,4,2,1]],  
[8,[8,4,2,1]],  
[15,[15,46,23,70,35,106,53,160,80,40,20,10,5,16,8,4,2,1]],  
[31,  
[31,94,47,142,71,214,107,322,161,484,242,121,364,182,91,274,137,412,206,103,310,155,466,233,700,350,175,526,263,790,395,1186,593,1780,890,445,1336,668,334,167,502,251,754,377,1132,566,283,850,425,1276,638,319,958,479,1438,719,2158,1079,3238,1619,4858,2429,7288,3644,1822,911,2734,1367,4102,2051,6154,3077,9232,4616,2308,1154,577,1732,866,433,1300,650,325,976,488,244,122,61,184,92,46,23,70,35,106,53,160,80,40,20,10,5,16,8,4,2,1]]  
]

}

---

<div class="post-metadata">

**Author:** ![bbazzarrakk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bbazzarrakk](https://www.ruby-forum.com/u/bbazzarrakk)\
**Post date:** [February 10, 2007, 12:36am UTC](https://www.ruby-forum.com/t/one-liners-113/85062/17 "2007-02-10T00:36:04Z")

</div>

> ```
> [999.12, "999.12"],
> [-9999.123, "-9,999.123"],
> [-12345, "-12,345"],
> [[[1],2], [1,2] ],
> 
> ```
> 
> :wondrous =\> [  
> [1, [1]],  
> [3,[3,10,5,16,8,4,2,1]],  
> [5,[5,16,8,4,2,1]],  
> [8,[8,4,2,1]],  
> [15,[15,46,23,70,35,106,53,160,80,40,20,10,5,16,8,4,2,1]],  
> [31,  
> [31,94,47,142,71,214,107,322,161,484,242,121,364,182,91,274,137,412,206,103,310,155,466,233,700,350,175,526,263,790,395,1186,593,1780,890,445,1336,668,334,167,502,251,754,377,1132,566,283,850,425,1276,638,319,958,479,1438,719,2158,1079,3238,1619,4858,2429,7288,3644,1822,911,2734,1367,4102,2051,6154,3077,9232,4616,2308,1154,577,1732,866,433,1300,650,325,976,488,244,122,61,184,92,46,23,70,35,106,53,160,80,40,20,10,5,16,8,4,2,1]]  
> ]
> 
> }

# Built-in classes for testing #4

:class\_from\_string =\> [  
[“OpenSSL”, OpenSSL],  
[“OpenSSL::Digest”, OpenSSL::Digest],  
[“OpenSSL::Digest::DigestError”, OpenSSL::Digest::DigestError],  
],

---

<div class="post-metadata">

**Author:** ![bbazzarrakk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bbazzarrakk](https://www.ruby-forum.com/u/bbazzarrakk)\
**Post date:** [February 10, 2007, 12:47am UTC](https://www.ruby-forum.com/t/one-liners-113/85062/18 "2007-02-10T00:47:05Z")

</div>

On Feb 9, 2007, at 5:35 PM, Phrogz wrote:

> # Built-in classes for testing #4
> 
> :class\_from\_string =\> [  
> [“OpenSSL”, OpenSSL],  
> [“OpenSSL::Digest”, OpenSSL::Digest],  
> [“OpenSSL::Digest::DigestError”, OpenSSL::Digest::DigestError],  
> ],

Technically those are constants, not classes. For example, OpenSSL  
is a module. That neatly foils a solution someone sent me off list  
today. 😉

James Edward G. II

---

<div class="post-metadata">

**Author:** ![bbazzarrakk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bbazzarrakk](https://www.ruby-forum.com/u/bbazzarrakk)\
**Post date:** [February 10, 2007, 1:01am UTC](https://www.ruby-forum.com/t/one-liners-113/85062/19 "2007-02-10T01:01:07Z")

</div>

On Feb 9, 4:46 pm, James Edward G. II [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
wrote:

> is a module. That neatly foils a solution someone sent me off list  
> today. 😉

I had wondered about that. The wording of the quiz says “class”, but I  
figure that:  
a) Given the number of modules-as-namespaces over classes-as-  
namespaces, a good solution to the problem allows module stops along  
the way, and thus  
b) If you’re going to allow non-classes along the way, you generally  
want the “resolve this as though I typed it” functionality, which may  
end in constants.

BUT…if the quiz has the wrinkle that only Classes should be returned  
(and thus you should get nil for the cases above), that would be  
interesting to program, too.

---

<div class="post-metadata">

**Author:** ![bbazzarrakk](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bbazzarrakk](https://www.ruby-forum.com/u/bbazzarrakk)\
**Post date:** [February 10, 2007, 1:09am UTC](https://www.ruby-forum.com/t/one-liners-113/85062/20 "2007-02-10T01:09:09Z")

</div>

On Feb 9, 2007, at 6:00 PM, Phrogz wrote:

> > 
> 
> want the “resolve this as though I typed it” functionality, which may  
> end in constants.
> 
> BUT…if the quiz has the wrinkle that only Classes should be returned  
> (and thus you should get nil for the cases above), that would be  
> interesting to program, too.

My solution handles either.

James Edward G. II

[Next page](https://www.ruby-forum.com/t/one-liners-113/85062.md?page=2)