Ruby examples (example source code) Organized by topic

1. Ruby

Rails /

Action 4	Application Framework 1	Controller 1	Cookie 1
Environment 1	ERB 7	Form Checkbox 1	Form RadioButton 1
Form Select 2	Form TextField 1	Form 2	Model 3
Rails 1	Session 1	View 4

ActiveRecord /

Assumption from ActiveRecord 3	Connection String 1	Delete 4	Insert 1
Map to SQL 6	One to Many 2	Primary key 1	Search 9
Table Name 6	Transactions 1	Update 2

Unit Test /

assert 5

Unit Testing 10

CGI /

CGI Form 5	CGI Variables 1	CGI 2	Cookie 1
HTML 9	Parameters 1	Session 2

Network /

action_mailer 2	Authentication 1	DNS 2	Email POP3 8
FTP Client 14	Ftp 1	hpricot HTML Parsing 5	HTML Builder 2
HTML Parser 4	HTTP Post 5	HTTP Reponse 11	HTTPS 5
IMAP 1	IP Address 4	mongrel Web Server 2	net http library 3
open uri 10	ping 4	Proxy 2	RSS 2
Ruby remoting 4	Server by gserver 4	SOAP 3	ssh 4
TCP Server 4	TCPSocket 3	Telnet 2	UDP Client 1
UDP Server 2	URI 10	Webrick Web Server 3	XML RPC 2
xmlrpc 8

Threads /

abort_on_exception 2	alive 1	critical 1	Daemon 3
exit 1	fork 6	join 6	kill 1
Mutex 2	pass 1	priority 2	Process 1
raise 1	Ruby Threads 4	run 1	safe_level 1
SizedQueue 1	sleep 5	status 1	stop 2
Synchronization 6	Thread.main 2	Thread.new 6	Thread.pass 1
wakeup 2

Array /

Array Addition 3	Array Creation 15	Array Each 3	Array Elements 9
Array Extension 16	Array Index 11	Array Length 1	Array Literal 2
Array Subtraction 1	Array.new 7	As Set 11	clear 1
clone 1	collect 3	combination 1	compact 1
Compare Array 5	concat 1	count 1	cycle 1
delete 2	delete_at 1	drop_while 1	each 5
each_index 1	each_with_index 1	empty 2	fill 1
find_all 1	find_index 1	first 2	freeze 1
grep 4	group_by 1	include 3	inject 3
insert 1	inspect 2	join 3	last 2
map 4	max 1	max_by 1	min 1
Multidimensional Arrays 7	Object array 1	pack 2	permutation 1
Pop 1	Print Array 1	product 1	Push 5
Range Index 2	reject 2	replace 1	reverse 3
reverse_each 2	select 1	shift 1	slice 4
sort 5	step 1	take_while 1	to Hash 1
to String 2	transpose 1	Two Array Indices 7	uniq 3
unpack 1	unshift 1

Hash /

assoc 1	clear 2	Compare 1	Converrt to Hash 1
Convert to Array 1	Convert to String 2	default 2	default_proc 1
delete 4	delete_if 5	each 4	each_key 2
each_value 2	empty 1	find 1	freeze 1
Hash Creation 11	Hash Elements 3	Hash Extensions 4	Hash Keys 11
Hash Length 1	Hash values 3	Hash.new 8	has_key 1
has_value 2	include 1	index 5	inject 2
invert 1	Key value 2	member 1	merge 4
Nested hash 2	Print Hash 4	rehash 1	reject 1
replace 3	select 1	shift 1	sort 2
sort_by 1	store 1	update 1	values 1
values_at 2

Range /

As Iterator 4	collect 1	Convert to Array 2	Date Range 4
drop 1	each 3	entries 1	find_all 1
first 1	include 1	inject 2	max 1
min 1	minmax 1	minmax_by 1	multi letter based range 1
partition 1	Range Creation 9	Range Extension 2	Range include 7
Range Min Max 3	Range.new 1	reduce 1	reverse_each 1
select 1	take 1	to Set 1	with case 1
with for 6	zip 1

Collections /

Comparable 4	Enumerable 10	Forwardable 3	Set 41
Your Hash 1	Your queue 1	Your stack 1	Your tree 8

Number /

abs 2	between 1	BigDecimal 12	Bignum class 3
Bignum 1	Binary number 4	ceil 1	coerce 1
Complex Numbers 1	Convert from Integer 1	Convert to Char 3	Convert to Float 4
Convert to Integer 14	Convert to String 8	Fixnum class 6	Fixnum extension 5
Float Extension 3	float 12	floor 1	hexadecimal numbers 3
infinite 4	Integer 12	matrix 4	nan 5
next 4	nonzero 4	Number class 7	Number Literal 7
Numeric class 7	octal numbers 3	Prime Numbers 6	Rational Numbers 16
round 4	shift 2	zero 2

Method /

alias 5	args 1	binding 2	block_given 3
call 1	Code Block 16	def 3	defined 1
define_method 3	lambda 6	Method Arguments 12	Method Creation 9
Method objects 1	Method Pointer 4	Overloading 1	Procs 8
recursive 1	remove_method 3	return 10	send 2
undef 1	Utility Method 6	Variable Number Arguments 5	yield 10

Class /

abstract class 2	Access level 4	attr 2	attr_accessor 5
attr_reader 4	attr_writer 3	child class 4	Class Defintion 11
Class Methods 4	Class Variables 3	clone 3	DelegateClass 2
Encapsulation 1	eql 2	equal 3	freeze 2
getter setter 9	include 4	inheritance 10	initialize class 5
inspect 2	instance variables 5	interface 1	Member method 6
Multiple inheritance 2	nested classes 2	new 2	object Creation 3
Object in Ruby 4	OpenStruct 1	Operator 2	Overriding Methods 4
Polymorphism 1	private 2	Protected 2	Public 2
Readable attributes 2	self 2	singleton method 4	Struct 1
super 2	tainted 3	to String 4	Virtual method 2
Writable Attributes 2

Reflection /

ancestors 2	caller 2	Class Reflection 6	class_eval 2
class_variable_get 1	eval 3	extend_object 1	FILE 1
find_all 1	global_variables 1	inherited 1	instance_eval 1
instance_method 1	instance_of 6	instance_variables 1	instance_variable_set 1
is_a 1	kind_of 3	local_variables 1	Method Reflection 5
method_added 1	method_defined 1	method_missing 6	Module Reflection 2
module_eval 2	Object 7	ObjectSpace 3	object_id 4
private_class_method 1	private_instance_methods 1	protected_instance_methods 1	protected_methods 1
remove_const 1	respond_to 5	set_trace_func 1	singleton_methods 1
singleton_method_added 3	superclass 3	variable Reflection 1

Database /

dbi drivers 1	dbm 4	Mysql 1	ODBC 1
Oracle 2	postgres 2	pstore 1

File Directory /

atime 2	basename 2	Binary File 7	blksize 1
blockdev 1	blocks 1	chardev 1	chdir 2
chmod 8	chown 1	close a file 1	ctime 2
delete 3	dev 3	Dir rewind 1	Dir.delete 1
Dir.entries 3	Dir.foreach 2	Dir.getwd 1	Dir.glob 1
Dir.open 2	Dir.pwd 1	Dir.reject 2	Dir.rmdir 1
Dir 10	directory list 2	directory 2	dirname 1
each byte 3	each line 2	each 2	eof 1
Executable.File 1	executable_real 1	exist 4	expand_path 1
extname 1	File class 2	file handle 1	File position 2
File SEPARATOR 2	File tests 4	File type 1	File.exists 2
File.new 5	file 1	Find 11	flock 1
fnmatch 2	ftype 2	gets 3	gid 1
grpowned 1	identical 2	ino 1	IO.close 1
IO.fileno 1	IO.flush 1	IO.foreach 2	IO.new 3
IO.popen 4	IO.puts 1	IO.read 3	IO.readlines 2
join 2	lock 1	lstat 2	mkdir 4
mode 1	mp3 file 2	mtime 2	nlink 1
Open a File 9	owned 1	path 1	pipe 1
putc 1	puts 2	pwd 2	rdev 3
Read lines together 3	read 4	Readable File 1	readable_real 1
readline 2	readlink 1	rename 1	seek 2
setgid 1	setuid 1	set_encoding 2	size 4
socket 1	split 1	stat 1	sticky 1
StringIO 7	subclass File 1	symlink 2	sysread 1
syswrite 2	tell 1	Tempfile 4	Text file 8
tmpdir 2	truncate 2	uid 1	ungetc 1
unlink 1	unmask 1	Utilities 10	utime 1
Word counter 4	world_readable 1	Writable File 1	writable_real 1
write 2	zero 1

XML /

rexml 18	XML Builder 4	xmlparser 1	XPath 10
YAML 6

Date /

ajd 1	Date Calculation 11	Date.new 5	DateTime 16
downto 1	gregorian 1	julian 3	mjd 1
next 2	parse 3	strptime 4	to String 1
to Time 2	today 1	upto 1

Time /

Compare Time 2	Convert to Date 1	Convert to Integer 1	ctime 1
Day Light Saving 5	day 1	dst 1	gm 2
hour 1	local 5	now 3	strftime 9
Time Calculation 5	Time class 3	Time Extension 3	Time format 5
Time Zones 2	timer 1	utc 2	year 1

String /

capitalize 3	casecmp 2	char in string 14	char range 4
chomp 3	chop 3	concat 2	Convert Number 3
Convert to Array 3	Convert to String 3	Convert to Symbol 2	crypt 1
delete 5	downcase 3	dump 1	each 2
each_byte 6	each_char 3	each_line 1	each_with_index 1
empty 1	encoding 10	end_with 1	eq 1
Escape Characters 14	force_encoding 1	freeze 5	grep 12
gsub 14	hash value 1	hash 1	Here Document 3
include 2	index 4	insert 3	intern 2
Justify Center 5	Justify Left 2	Justify Right 4	length 2
lines 1	match 6	matching operator 2	multiply strings 4
next 8	replace 3	reverse 5	scan 15
select 2	slice 3	split 8	squeeze 1
String class Extension 20	String comparisons 10	String Concatenation 7	String format 5
String from Right 1	String Literal 9	String Quotation 9	String Range 7
string variable 4	String.new 5	Strip from Left 2	Strip from right 1
Strip 5	sub with regular expressions 8	sub 1	succ 3
sum 2	swapcase 2	tr 2	tr_s 1
unicode 5	upcase 5	upto 1	wrap 2

Design Patterns /

Command 4	Composite 5	Decorator 1	Factory 2
Iterator 1	Observer 4	Singletons 6	Strategy 3

GUI /

gtk 2

opengl 1

wxruby 1

Tk /

Entry TextField 2	Layout 5	Main Window 3	TkButton 2
TkLabel 3	TkListbox 1	TkRadioButton 1

Language Basics /

Bitwise Operations 5	Boolean Operators 9	Boolean variable 2	Code statement 2
Comments 5	Comparison Operators 5	Constants 7	Global Constants 1
Global Variables 2	Interpolating 15	irb 4	load 2
Math Operators 10	Mixins 5	Modules Creation 16	nil 5
Operator Precedence 2	Operators 2	Parallel Assignment 2	Predefined Variables 1
putc 1	puts 23	rake 2	RDoc 5
require 4	Reserved words 5	ri 5	Ruby Commandline 3
Ruby Interpreter 5	RubyGems 12	shebang line 2	STDOUT 2
Symbols 7	Ternary Operator 4	Variable scope 5	Variables 23

Statement /

BEGIN END 3	break 5	case 9	catch 2
downto 5	ensure 1	for 4	if as modifier 5
If 18	in 3	include 1	loop 1
next 1	raise 5	redo 1	rescue 6
retry 2	step 1	throw 2	times 8
unless as Modifiers 2	unless 4	Until as modifier 1	until 6
upto 10	while as Modifier 2	while 8

Development /

ARGF 3	ARGV 4	Aspect Oriented Programming 1	Benchmark 5
chomp 2	Command line 1	csv 10	Data Type 2
Embedded Ruby 5	Embeded C 1	ENV 2	eval 5
Exception 4	exec 1	GC 2	gem 7
Generator 2	gets 8	KCODE 8	Kernel 1
Keyboard reading 1	logger 4	Marshal 2	Match Operator 2
Math extensions 9	Math.constants 3	Math 10	print 3
printf 5	Process 4	profile 2	PStore 2
rand 7	Regexps Group 5	Regexps Repetition 18	Regexps 29
RUBY_PLATFORM 1	scanf 1	Shell 1	sprintf 5
SyncEnumerator 1	system 5	Timeout 2	Unicode 1
Utility Regexps 3	Your Exception 3	zip 3

Windows Platform /

Dialog 1	Excel 5	Internet Explorer 7	Powerpoint 1
Sound 1	Win32API 5	winsock 1	Word 4