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Returns true if the given calendar date is valid, and false if not.

Date.valid_date?(2001,2,3)        #=> true
Date.valid_date?(2001,2,29)       #=> false

See also ::jd and ::civil.

Returns true if the given week date is valid, and false if not.

Date.valid_commercial?(2001,5,6)  #=> true
Date.valid_commercial?(2001,5,8)  #=> false

See also ::jd and ::commercial.

This method is equivalent to d >> n.

See Date#>> for examples.

This method is equivalent to d << n.

See Date#<< for examples.

Returns a Time object which denotes self.

Returns self.

Deserializes JSON string by converting Julian year y, month m, day d and Day of Calendar Reform sg to Date.

Returns a Time object which denotes self.

Returns a Date object which denotes self.

Deserializes JSON string by converting year y, month m, day d, hour H, minute M, second S, offset of and Day of Calendar Reform sg to DateTime.

Returns self.

Returns a Date object which denotes self.

Deserializes JSON string by converting time since epoch to Time

Returns an array containing the values associated with the given keys.

Calls the block once for each [key, value] pair in the database. Returns self.

Deserializes JSON string by constructing new Struct object with values v serialized by to_json.

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

Returns the struct member values for each selector as an Array. A selector may be either an Integer offset or a Range of offsets (as in Array#values_at).

Customer = Struct.new(:name, :address, :zip)
joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345)
joe.values_at(0, 2)   #=> ["Joe Smith", 12345]

IO.copy_stream copies src to dst. src and dst is either a filename or an IO.

This method returns the number of bytes copied.

If optional arguments are not given, the start position of the copy is the beginning of the filename or the current file offset of the IO. The end position of the copy is the end of file.

If copy_length is given, No more than copy_length bytes are copied.

If src_offset is given, it specifies the start position of the copy.

When src_offset is specified and src is an IO, IO.copy_stream doesn’t move the current file offset.

Returns the Encoding object that represents the encoding of the file. If io is in write mode and no encoding is specified, returns nil.

Returns the Encoding of the internal string if conversion is specified. Otherwise returns nil.

Returns an array of the values associated with each specified key.

Executes block for each key in the database, passing the key and the corresponding value as a parameter.