Returns true if the given calendar date is valid, and false if not. Valid in this context is whether the arguments passed to this method would be accepted by ::new
.
Date.valid_date?(2001,2,3) #=> true Date.valid_date?(2001,2,29) #=> false Date.valid_date?(2001,2,-1) #=> true
Returns self.
Returns a DateTime
object which denotes self.
Deserializes JSON
string by converting Julian year y
, month m
, day d
and Day of Calendar Reform sg
to Date
.
Returns a Date
object which denotes self.
Returns 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 a Date
object which denotes self.
Returns a DateTime
object which denotes self.
Returns the offset in seconds between the timezone of time and UTC.
t = Time.gm(2000,1,1,20,15,1) #=> 2000-01-01 20:15:01 UTC t.gmt_offset #=> 0 l = t.getlocal #=> 2000-01-01 14:15:01 -0600 l.gmt_offset #=> -21600
Returns an array containing the values associated with the given keys.
Calls the block once for each value string in the database. Returns self.
Calls the block once for each key string in the database. Returns self.
Calls the block once for each [key, value] pair in the database. Returns self.
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]
Executes the block for every line in ios, where lines are separated by sep. ios 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 {|line| puts "#{f.lineno}: #{line}" }
produces:
1: This is line one 2: This is line two 3: This is line three 4: And so on...
See IO.readlines
for details about getline_args.
Calls the given block once for each byte (0..255) in ios, passing the byte 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") checksum = 0 f.each_byte {|x| checksum ^= x } #=> #<File:testfile> checksum #=> 12
Passes the Integer
ordinal of each character in ios, passing the codepoint 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.
Returns an array of the values associated with each specified key.
Executes block for each key in the database, passing the corresponding value as a parameter.