Calls the block once for each [key, value] pair in the database. Returns self.
Returns a hash, that will be turned into a JSON object and represent this object.
Yields the name and value of each struct member in order. If no block is given an enumerator is returned.
Customer = Struct.new(:name, :address, :zip) joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345) joe.each_pair {|name, value| puts("#{name} => #{value}") }
Produces:
name => Joe Smith address => 123 Maple, Anytown NC zip => 12345
Waits until IO is readable without blocking and returns self, or nil when times out. Returns true immediately when buffered data is available.
Calls the given block once for each character in ios, passing the character as an argument. The stream must be opened for reading or an IOError will be raised.
If no block is given, an enumerator is returned instead.
f = File.new("testfile") f.each_char {|c| print c, ' ' } #=> #<File:testfile>
Returns ios.
Closes the write end of a duplex I/O stream (i.e., one that contains both a read and a write stream, such as a pipe). Will raise an IOError if the stream is not duplexed.
f = IO.popen("/bin/sh","r+") f.close_write f.print "nowhere"
produces:
prog.rb:3:in `write': not opened for writing (IOError) from prog.rb:3:in `print' from prog.rb:3
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.
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 ‘exception: false`, the options hash allows you to indicate that read_nonblock should not raise an IO::WaitReadable exception, but return the symbol :wait_readable instead.
Executes block for each key in the database, passing the key and the corresponding value as a parameter.
Returns a hash, that will be turned into a JSON object and represent this object.
Stores class name (OpenStruct) with this struct’s values v as a JSON string.
Returns a hash, that will be turned into a JSON object and represent this object.
Stores class name (Range) with JSON array of arguments a which include first (integer), last (integer), and exclude_end? (boolean) as JSON string.
Deserializes JSON string by constructing new Regexp object with source s (Regexp or String) and options o serialized by to_json
Returns a hash, that will be turned into a JSON object and represent this object.
Returns a hash, that will be turned into a JSON object and represent this object.