The required_rubygems_version
constraint for this specification
A fallback is included because the original version of the specification API didn’t include that field, so some marshalled specs in the index have it set to nil
.
The required_rubygems_version
constraint for this specification
With a block given, calls the block with each repeated permutation of length size
of the elements of self
; each permutation is an array; returns self
. The order of the permutations is indeterminate.
If a positive integer argument size
is given, calls the block with each size
-tuple repeated permutation of the elements of self
. The number of permutations is self.size**size
.
Examples:
size
is 1:
p = [] [0, 1, 2].repeated_permutation(1) {|permutation| p.push(permutation) } p # => [[0], [1], [2]]
size
is 2:
p = [] [0, 1, 2].repeated_permutation(2) {|permutation| p.push(permutation) } p # => [[0, 0], [0, 1], [0, 2], [1, 0], [1, 1], [1, 2], [2, 0], [2, 1], [2, 2]]
If size
is zero, calls the block once with an empty array.
If size
is negative, does not call the block:
[0, 1, 2].repeated_permutation(-1) {|permutation| fail 'Cannot happen' }
With no block given, returns a new Enumerator
.
Related: see Methods for Combining.
Returns an array of the grapheme clusters in self
(see Unicode Grapheme Cluster Boundaries):
s = "\u0061\u0308-pqr-\u0062\u0308-xyz-\u0063\u0308" # => "ä-pqr-b̈-xyz-c̈" s.grapheme_clusters # => ["ä", "-", "p", "q", "r", "-", "b̈", "-", "x", "y", "z", "-", "c̈"]
Returns true
if obj responds to the given method. Private and protected methods are included in the search only if the optional second parameter evaluates to true
.
If the method is not implemented, as Process.fork
on Windows, File.lchmod
on GNU/Linux, etc., false is returned.
If the method is not defined, respond_to_missing?
method is called and the result is returned.
When the method name parameter is given as a string, the string is converted to a symbol.
Creates module functions for the named methods. These functions may be called with the module as a receiver, and also become available as instance methods to classes that mix in the module. Module
functions are copies of the original, and so may be changed independently. The instance-method versions are made private. If used with no arguments, subsequently defined methods become module functions. String
arguments are converted to symbols. If a single argument is passed, it is returned. If no argument is passed, nil is returned. If multiple arguments are passed, the arguments are returned as an array.
module Mod def one "This is one" end module_function :one end class Cls include Mod def call_one one end end Mod.one #=> "This is one" c = Cls.new c.call_one #=> "This is one" module Mod def one "This is the new one" end end Mod.one #=> "This is one" c.call_one #=> "This is the new one"
Equivalent to >>
with argument n
.
See as_json
.
See as_json
.
Reads at most maxlen bytes from ios using the read(2) system call after O_NONBLOCK is set for the underlying file descriptor.
If the optional outbuf argument is present, it must reference a String
, which will receive the data. The outbuf will contain only the received data after the method call even if it is not empty at the beginning.
read_nonblock
just calls the read(2) system call. It causes all errors the read(2) system call causes: Errno::EWOULDBLOCK, Errno::EINTR, etc. The caller should care such errors.
If the exception is Errno::EWOULDBLOCK or Errno::EAGAIN, it is extended by IO::WaitReadable
. So IO::WaitReadable
can be used to rescue the exceptions for retrying read_nonblock.
read_nonblock
causes EOFError
on EOF.
On some platforms, such as Windows, non-blocking mode is not supported on IO
objects other than sockets. In such cases, Errno::EBADF will be raised.
If the read byte buffer is not empty, read_nonblock
reads from the buffer like readpartial. In this case, the read(2) system call is not called.
When read_nonblock
raises an exception kind of IO::WaitReadable
, read_nonblock
should not be called until io is readable for avoiding busy loop. This can be done as follows.
# emulates blocking read (readpartial). begin result = io.read_nonblock(maxlen) rescue IO::WaitReadable IO.select([io]) retry end
Although IO#read_nonblock
doesn’t raise IO::WaitWritable
. OpenSSL::Buffering#read_nonblock
can raise IO::WaitWritable
. If IO
and SSL should be used polymorphically, IO::WaitWritable
should be rescued too. See the document of OpenSSL::Buffering#read_nonblock
for sample code.
Note that this method is identical to readpartial except the non-blocking flag is set.
By specifying a keyword argument exception to false
, you can indicate that read_nonblock
should not raise an IO::WaitReadable
exception, but return the symbol :wait_readable
instead. At EOF, it will return nil instead of raising EOFError
.
See as_json
.
Returns true if this class can be used to create an instance from a serialised JSON
string. The class has to implement a class method json_create that expects a hash as first parameter. The hash should include the required data.