Results for: "Array.new"

Enumerator#next

Returns the next object in the enumerator, and move the internal position forward. When the position reached at the end, StopIteration is raised.

Example

a = [1,2,3]
e = a.to_enum
p e.next   #=> 1
p e.next   #=> 2
p e.next   #=> 3
p e.next   #raises StopIteration

See class-level notes about external iterators.

Enumerator#rewind

Rewinds the enumeration sequence to the beginning.

If the enclosed object responds to a “rewind” method, it is called.

Object#display

Writes self on the given port:

1.display
"cat".display
[ 4, 5, 6 ].display
puts

Output:

1cat[4, 5, 6]

Exception#backtrace

Returns the backtrace (the list of code locations that led to the exception), as an array of strings.

Example (assuming the code is stored in the file named t.rb):

def division(numerator, denominator)
  numerator / denominator
end

begin
  division(1, 0)
rescue => ex
  p ex.backtrace
  # ["t.rb:2:in 'Integer#/'", "t.rb:2:in 'Object#division'", "t.rb:6:in '<main>'"]
  loc = ex.backtrace.first
  p loc.class
  # String
end

The value returned by this method migth be adjusted when raising (see Kernel#raise), or during intermediate handling by set_backtrace.

See also backtrace_locations that provide the same value, as structured objects. (Note though that two values might not be consistent with each other when backtraces are manually adjusted.)

see Backtraces.

NoMethodError#args

Return the arguments passed in as the third parameter to the constructor.

SystemCallError#errno

Return this SystemCallError’s error number.

Module#refine

Refine mod in the receiver.

Returns a module, where refined methods are defined.

Module#refinements

Returns an array of Refinement defined within the receiver.

module A
  refine Integer do
  end

  refine String do
  end
end

p A.refinements

produces:

[#<refinement:Integer@A>, #<refinement:String@A>]

Module::nesting

Returns the list of Modules nested at the point of call.

module M1
  module M2
    $a = Module.nesting
  end
end
$a           #=> [M1::M2, M1]
$a[0].name   #=> "M1::M2"

CGI::parse

Parse an HTTP query string into a hash of key=>value pairs.

params = CGI.parse("query_string")
  # {"name1" => ["value1", "value2", ...],
  #  "name2" => ["value1", "value2", ...], ... }

Date::_parse

Note: This method recognizes many forms in string, but it is not a validator. For formats, see “Specialized Format Strings” in Formats for Dates and Times

If string does not specify a valid date, the result is unpredictable; consider using Date._strptime instead.

Returns a hash of values parsed from string:

Date._parse('2001-02-03') # => {:year=>2001, :mon=>2, :mday=>3}

If comp is true and the given year is in the range (0..99), the current century is supplied; otherwise, the year is taken as given:

Date._parse('01-02-03', true)  # => {:year=>2001, :mon=>2, :mday=>3}
Date._parse('01-02-03', false) # => {:year=>1, :mon=>2, :mday=>3}

See argument limit.

Related: Date.parse(returns a Date object).

Note: This method recognizes many forms in string, but it is not a validator. For formats, see “Specialized Format Strings” in Formats for Dates and Times If string does not specify a valid date, the result is unpredictable; consider using Date._strptime instead.

Returns a new Date object with values parsed from string:

Date.parse('2001-02-03')   # => #<Date: 2001-02-03>
Date.parse('20010203')     # => #<Date: 2001-02-03>
Date.parse('3rd Feb 2001') # => #<Date: 2001-02-03>

If comp is true and the given year is in the range (0..99), the current century is supplied; otherwise, the year is taken as given:

Date.parse('01-02-03', true)  # => #<Date: 2001-02-03>
Date.parse('01-02-03', false) # => #<Date: 0001-02-03>

See:

Argument start.
Argument limit.

Related: Date._parse (returns a hash).

Date#year

Returns the year:

Date.new(2001, 2, 3).year    # => 2001
(Date.new(1, 1, 1) - 1).year # => 0

Date#yday

Returns the day of the year, in range (1..366):

Date.new(2001, 2, 3).yday # => 34

Date#mday

Returns the day of the month in range (1..31):

Date.new(2001, 2, 3).mday # => 3

Date#day

Returns the day of the month in range (1..31):

Date.new(2001, 2, 3).mday # => 3

Date#cwyear

Returns commercial-date year for self (see Date.commercial):

Date.new(2001, 2, 3).cwyear # => 2001
Date.new(2000, 1, 1).cwyear # => 1999

Date#cwday

Returns the commercial-date weekday index for self (see Date.commercial); 1 is Monday:

Date.new(2001, 2, 3).cwday # => 6

Date#wday

Returns the day of week in range (0..6); Sunday is 0:

Date.new(2001, 2, 3).wday # => 6