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Returns true if file_name is an absolute path, and false otherwise.

File.absolute_path?("c:/foo")     #=> false (on Linux), true (on Windows)

Returns the pathname used to create file as a string. Does not normalize the name.

The pathname may not point to the file corresponding to file. For instance, the pathname becomes void when the file has been moved or deleted.

This method raises IOError for a file created using File::Constants::TMPFILE because they don’t have a pathname.

File.new("testfile").path               #=> "testfile"
File.new("/tmp/../tmp/xxx", "w").path   #=> "/tmp/../tmp/xxx"

Returns whether ASCII-compatible or not.

Encoding::UTF_8.ascii_compatible?     #=> true
Encoding::UTF_16BE.ascii_compatible?  #=> false

Returns any backtrace associated with the exception. This method is similar to Exception#backtrace, but the backtrace is an array of Thread::Backtrace::Location.

This method is not affected by Exception#set_backtrace().

Deserializes JSON string by constructing new Exception object with message m and backtrace b serialized with to_json

Return true if the caused method was called as private.

When this module is included in another, Ruby calls append_features in this module, passing it the receiving module in mod. Ruby’s default implementation is to add the constants, methods, and module variables of this module to mod if this module has not already been added to mod or one of its ancestors. See also Module#include.

When this module is prepended in another, Ruby calls prepend_features in this module, passing it the receiving module in mod. Ruby’s default implementation is to overlay the constants, methods, and module variables of this module to mod if this module has not already been added to mod or one of its ancestors. See also Module#prepend.

Creates instance variables and corresponding methods that return the value of each instance variable. Equivalent to calling “attr:name” on each name in turn. String arguments are converted to symbols.

Creates an accessor method to allow assignment to the attribute symbol.id2name. String arguments are converted to symbols.

Defines a named attribute for this module, where the name is symbol.id2name, creating an instance variable (@name) and a corresponding access method to read it. Also creates a method called name= to set the attribute. String arguments are converted to symbols.

module Mod
  attr_accessor(:one, :two)
end
Mod.instance_methods.sort   #=> [:one, :one=, :two, :two=]

Makes a list of existing constants private.

Makes a list of existing constants deprecated. Attempt to refer to them will produce a warning.

module HTTP
  NotFound = Exception.new
  NOT_FOUND = NotFound # previous version of the library used this name

  deprecate_constant :NOT_FOUND
end

HTTP::NOT_FOUND
# warning: constant HTTP::NOT_FOUND is deprecated

Import a JSON Marshalled object.

method used for JSON marshalling support.

Deserializes JSON string by converting numerator value n, denominator value d, to a Rational object.

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

See also ::jd and ::civil.

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.

Deserializes JSON string by converting time since epoch to Time