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This page lists the built-in Ruby classes and modules, and the methods they contain. Click on a class, module, or method name for a detailed description.
classes
Array
[ ]
new
&
*
+
-
<<
<=>
==
===
[ ]
[ ]=
|
assoc
at
clear
collect
collect!
compact
compact!
concat
delete
delete_at
delete_if
each
each_index
empty?
eql?
fill
first
flatten
flatten!
include?
index
indexes
indices
join
last
length
map!
nitems
pack
pop
push
rassoc
reject!
replace
reverse
reverse!
reverse_each
rindex
shift
size
slice
slice!
sort
sort!
to_a
to_ary
to_s
uniq
uniq!
unshift
Bignum
Arithmetic operations
Bit operations
<=>
[ ]
size
to_f
to_i
to_s
Binding
Class
inherited
new
new
superclass
Continuation
call
Dir
[ ]
chdir
chroot
delete
entries
foreach
getwd
glob
mkdir
new
open
pwd
rmdir
unlink
close
each
read
rewind
seek
tell
Exception
exception
backtrace
exception
message
set_backtrace
FalseClass
&
^
|
File
atime
basename
chmod
chown
ctime
delete
dirname
expand_path
ftype
join
link
lstat
mtime
new
open
readlink
rename
size
split
stat
symlink
truncate
umask
unlink
utime
atime
chmod
chown
ctime
flock
lstat
mtime
path
truncate
File::Stat
<=>
atime
blksize
blockdev?
blocks
chardev?
ctime
dev
directory?
executable?
executable_real?
file?
ftype
gid
grpowned?
ino
mode
mtime
nlink
owned?
pipe?
rdev
readable?
readable_real?
setgid?
setuid?
size
size?
socket?
sticky?
symlink?
uid
writable?
writable_real?
zero?
Fixnum
Arithmetic operations
Bit operations
<=>
[ ]
id2name
size
to_f
to_i
to_s
Float
Arithmetic operations
<=>
ceil
finite?
floor
infinite?
nan?
round
to_f
to_i
to_s
Hash
[ ]
new
==
[ ]
[ ]=
clear
default
default=
delete
delete_if
each
each_key
each_pair
each_value
empty?
fetch
has_key?
has_value?
include?
index
indexes
indices
invert
key?
keys
length
member?
rehash
reject
reject!
replace
shift
size
sort
store
to_a
to_s
update
value?
values
Integer
chr
downto
integer?
next
step
succ
times
upto
IO
foreach
new
pipe
popen
readlines
select
<<
binmode
clone
close
close_read
close_write
closed?
each
each_byte
each_line
eof
eof?
fcntl
fileno
flush
getc
gets
ioctl
isatty
lineno
lineno=
pid
pos
pos=
print
printf
putc
puts
read
readchar
readline
readlines
reopen
rewind
seek
stat
sync
sync=
sysread
syswrite
tell
to_i
to_io
tty?
ungetc
write
MatchData
[ ]
begin
end
length
offset
post_match
pre_match
size
string
to_a
to_s
Method
[ ]
arity
call
to_proc
Module
constants
nesting
new
<, <=, >, >=
<=>
===
ancestors
class_eval
class_variables
clone
const_defined?
const_get
const_set
constants
included_modules
instance_methods
method_defined?
module_eval
name
private_class_method
private_instance_methods
protected_instance_methods
public_class_method
public_instance_methods
alias_method
append_features
attr
attr_accessor
attr_reader
attr_writer
extend_object
include
method_added
module_function
private
protected
public
remove_const
remove_method
undef_method
NilClass
&
^
|
nil?
to_a
to_i
to_s
Numeric
+@
-@
abs
coerce
divmod
eql?
integer?
modulo
nonzero?
remainder
zero?
Object
==
===
=~
__id__
__send__
class
clone
display
dup
eql?
equal?
extend
freeze
frozen?
hash
id
inspect
instance_eval
instance_of?
instance_variables
is_a?
kind_of?
method
method_missing
methods
nil?
private_methods
protected_methods
public_methods
respond_to?
send
singleton_methods
taint
tainted?
to_a
to_s
type
untaint
Proc
new
[ ]
arity
call
Range
new
===
begin
each
end
exclude_end?
first
last
length
size
Regexp
compile
escape
last_match
new
quote
==
===
=~
~
casefold?
kcode
match
source
String
new
%
*
+
<<
<=>
==
===
=~
[ ]
[ ]=
~
capitalize
capitalize!
center
chomp
chomp!
chop
chop!
concat
count
crypt
delete
delete!
downcase
downcase!
dump
each
each_byte
each_line
empty?
gsub
gsub!
hash
hex
include?
index
intern
length
ljust
next
next!
oct
replace
reverse
reverse!
rindex
rjust
scan
size
slice
slice!
split
squeeze
squeeze!
strip
strip!
sub
sub!
succ
succ!
sum
swapcase
swapcase!
to_f
to_i
to_s
to_str
tr
tr!
tr_s
tr_s!
unpack
upcase
upcase!
upto
Struct
new
new
members
==
[ ]
[ ]=
each
length
members
size
to_a
values
Struct::Tms
Symbol
id2name
inspect
to_i
to_s
Thread
abort_on_exception
abort_on_exception=
critical
critical=
current
exit
fork
kill
list
main
new
pass
start
stop
[ ]
[ ]=
abort_on_exception
abort_on_exception=
alive?
exit
join
key?
kill
priority
priority=
raise
run
safe_level
status
stop?
value
wakeup
ThreadGroup
new
add
list
Time
at
gm
local
mktime
new
now
times
utc
+
-
<=>
asctime
ctime
day
gmt?
gmtime
hour
isdst
localtime
mday
min
mon
month
sec
strftime
to_a
to_f
to_i
to_s
tv_sec
tv_usec
usec
utc
utc?
wday
yday
year
zone
TrueClass
&
^
|
modules
Comparable
Comparisons
between?
Enumerable
collect
detect
each_with_index
entries
find
find_all
grep
include?
map
max
member?
min
reject
select
sort
to_a
Errno
FileTest
GC
disable
enable
start
garbage_collect
Kernel
Array
Float
Integer
String
` (backquote)
abort
at_exit
autoload
binding
block_given?
callcc
caller
catch
chomp
chomp!
chop
chop!
eval
exec
exit
exit!
fail
fork
format
gets
global_variables
gsub
gsub!
iterator?
lambda
load
local_variables
loop
open
p
print
printf
proc
putc
puts
raise
rand
readline
readlines
require
scan
select
set_trace_func
singleton_method_added
sleep
split
sprintf
srand
sub
sub!
syscall
system
test
throw
trace_var
trap
untrace_var
Marshal
dump
load
restore
Math
atan2
cos
exp
frexp
ldexp
log
log10
sin
sqrt
tan
ObjectSpace
_id2ref
define_finalizer
each_object
garbage_collect
undefine_finalizer
Process
egid
egid=
euid
euid=
exit!
fork
getpgid
getpgrp
getpriority
gid
gid=
kill
pid
ppid
setpgid
setpgrp
setpriority
setsid
uid
uid=
wait
wait2
waitpid
waitpid2
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