Iterates over each key-value pair in the database.
If no block is given, returns an Enumerator.
Calls block once for each key in hsh, passing the key-value pair as parameters.
If no block is given, an enumerator is returned instead.
h = { "a" => 100, "b" => 200 } h.each {|key, value| puts "#{key} is #{value}" }
produces:
a is 100 b is 200
Yields each environment variable name and value.
If no block is given an Enumerator is returned.
Returns an array with bindir attached to each executable in the executables list
creates a temporary directory with hax TODO: deprecate and remove
Redirects to url with a WEBrick::HTTPStatus::Redirect status.
Example:
res.set_redirect WEBrick::HTTPStatus::TemporaryRedirect
Quietly ensure the Gem directory dir contains all the proper subdirectories for handling default gems. If we can’t create a directory due to a permission problem, then we will silently continue.
If mode is given, missing directories are created with this mode.
World-writable directories will never be created.
Returns the first element, or the first n elements, of the array. If the array is empty, the first form returns nil, and the second form returns an empty array. See also Array#last for the opposite effect.
a = [ "q", "r", "s", "t" ] a.first #=> "q" a.first(2) #=> ["q", "r"]
Extracts the nested value specified by the sequence of idx objects by calling dig at each step, returning nil if any intermediate step is nil.
a = [[1, [2, 3]]] a.dig(0, 1, 1) #=> 3 a.dig(1, 2, 3) #=> nil a.dig(0, 0, 0) #=> TypeError: Integer does not have #dig method [42, {foo: :bar}].dig(1, :foo) #=> :bar
Returns a Digest subclass by name in a thread-safe manner even when on-demand loading is involved.
require 'digest' Digest("MD5") # => Digest::MD5 Digest(:SHA256) # => Digest::SHA256 Digest(:Foo) # => LoadError: library not found for class Digest::Foo -- digest/foo
Prints obj on the given port (default $>). Equivalent to:
def display(port=$>) port.write self nil end
For example:
1.display "cat".display [ 4, 5, 6 ].display puts
produces:
1cat[4, 5, 6]
Performs integer division: returns the integer result of dividing int by numeric.
Returns the floating point result of dividing int by numeric.
654321.fdiv(13731) #=> 47.652829364212366 654321.fdiv(13731.24) #=> 47.65199646936475 -654321.fdiv(13731) #=> -47.652829364212366
Returns the digits of int‘s place-value representation with radix base (default: 10). The digits are returned as an array with the least significant digit as the first array element.
base must be greater than or equal to 2.
12345.digits #=> [5, 4, 3, 2, 1] 12345.digits(7) #=> [4, 6, 6, 0, 5] 12345.digits(100) #=> [45, 23, 1] -12345.digits(7) #=> Math::DomainError
Performs division as each part is a float, never returns a float.
Complex(11, 22).fdiv(3) #=> (3.6666666666666665+7.333333333333333i)
Returns float division.
Uses / to perform division, then converts the result to an integer. Numeric does not define the / operator; this is left to subclasses.
Equivalent to num.divmod(numeric)[0].
See Numeric#divmod.
Returns an array containing the quotient and modulus obtained by dividing num by numeric.
If q, r = x.divmod(y), then
q = floor(x/y) x = q*y + r
The quotient is rounded toward negative infinity, as shown in the following table:
a | b | a.divmod(b) | a/b | a.modulo(b) | a.remainder(b) ------+-----+---------------+---------+-------------+--------------- 13 | 4 | 3, 1 | 3 | 1 | 1 ------+-----+---------------+---------+-------------+--------------- 13 | -4 | -4, -3 | -4 | -3 | 1 ------+-----+---------------+---------+-------------+--------------- -13 | 4 | -4, 3 | -4 | 3 | -1 ------+-----+---------------+---------+-------------+--------------- -13 | -4 | 3, -1 | 3 | -1 | -1 ------+-----+---------------+---------+-------------+--------------- 11.5 | 4 | 2, 3.5 | 2.875 | 3.5 | 3.5 ------+-----+---------------+---------+-------------+--------------- 11.5 | -4 | -3, -0.5 | -2.875 | -0.5 | 3.5 ------+-----+---------------+---------+-------------+--------------- -11.5 | 4 | -3, 0.5 | -2.875 | 0.5 | -3.5 ------+-----+---------------+---------+-------------+--------------- -11.5 | -4 | 2, -3.5 | 2.875 | -3.5 | -3.5
Examples
11.divmod(3) #=> [3, 2] 11.divmod(-3) #=> [-4, -1] 11.divmod(3.5) #=> [3, 0.5] (-11).divmod(3.5) #=> [-4, 3.0] 11.5.divmod(3.5) #=> [3, 1.0]
Returns the Encoding object that represents the encoding of obj.
Returns float / numeric, same as Float#/.
Returns the birth time for the named file.
file_name can be an IO object.
File.birthtime("testfile") #=> Wed Apr 09 08:53:13 CDT 2003
If the platform doesn’t have birthtime, raises NotImplementedError.
Returns the birth time for file.
File.new("testfile").birthtime #=> Wed Apr 09 08:53:14 CDT 2003
If the platform doesn’t have birthtime, raises NotImplementedError.