Commit 45e70e4d authored by Seba Gamboa's avatar Seba Gamboa

Fix enumerator doc errors

parent 5cdcce8d
......@@ -6,93 +6,92 @@
# A class which allows both internal and external iteration.
#
# An Enumerator can be created by the following methods.
# - Kernel#to_enum
# - Kernel#enum_for
# - Enumerator.new
# - {Kernel#to_enum}
# - {Kernel#enum_for}
# - {Enumerator#initialize Enumerator.new}
#
# Most methods have two forms: a block form where the contents
# are evaluated for each item in the enumeration, and a non-block form
# which returns a new Enumerator wrapping the iteration.
#
# enumerator = %w(one two three).each
# puts enumerator.class # => Enumerator
# enumerator = %w(one two three).each
# puts enumerator.class # => Enumerator
#
# enumerator.each_with_object("foo") do |item, obj|
# puts "#{obj}: #{item}"
# end
# enumerator.each_with_object("foo") do |item, obj|
# puts "#{obj}: #{item}"
# end
#
# # foo: one
# # foo: two
# # foo: three
# # foo: one
# # foo: two
# # foo: three
#
# enum_with_obj = enumerator.each_with_object("foo")
# puts enum_with_obj.class # => Enumerator
# enum_with_obj = enumerator.each_with_object("foo")
# puts enum_with_obj.class # => Enumerator
#
# enum_with_obj.each do |item, obj|
# puts "#{obj}: #{item}"
# end
# enum_with_obj.each do |item, obj|
# puts "#{obj}: #{item}"
# end
#
# # foo: one
# # foo: two
# # foo: three
# # foo: one
# # foo: two
# # foo: three
#
# This allows you to chain Enumerators together. For example, you
# can map a list's elements to strings containing the index
# and the element as a string via:
#
# puts %w[foo bar baz].map.with_index { |w, i| "#{i}:#{w}" }
# # => ["0:foo", "1:bar", "2:baz"]
# puts %w[foo bar baz].map.with_index { |w, i| "#{i}:#{w}" }
# # => ["0:foo", "1:bar", "2:baz"]
#
# An Enumerator can also be used as an external iterator.
# For example, Enumerator#next returns the next value of the iterator
# or raises StopIteration if the Enumerator is at the end.
#
# e = [1,2,3].each # returns an enumerator object.
# puts e.next # => 1
# puts e.next # => 2
# puts e.next # => 3
# puts e.next # raises StopIteration
# e = [1,2,3].each # returns an enumerator object.
# puts e.next # => 1
# puts e.next # => 2
# puts e.next # => 3
# puts e.next # raises StopIteration
#
# You can use this to implement an internal iterator as follows:
#
# def ext_each(e)
# while true
# begin
# vs = e.next_values
# rescue StopIteration
# return $!.result
# def ext_each(e)
# while true
# begin
# vs = e.next_values
# rescue StopIteration
# return $!.result
# end
# y = yield(*vs)
# e.feed y
# end
# end
# y = yield(*vs)
# e.feed y
# end
# end
#
# o = Object.new
# o = Object.new
#
# def o.each
# puts yield
# puts yield(1)
# puts yield(1, 2)
# 3
# end
# def o.each
# puts yield
# puts yield(1)
# puts yield(1, 2)
# 3
# end
#
# # use o.each as an internal iterator directly.
# puts o.each {|*x| puts x; [:b, *x] }
# # => [], [:b], [1], [:b, 1], [1, 2], [:b, 1, 2], 3
# # use o.each as an internal iterator directly.
# puts o.each {|*x| puts x; [:b, *x] }
# # => [], [:b], [1], [:b, 1], [1, 2], [:b, 1, 2], 3
#
# # convert o.each to an external iterator for
# # implementing an internal iterator.
# puts ext_each(o.to_enum) {|*x| puts x; [:b, *x] }
# # => [], [:b], [1], [:b, 1], [1, 2], [:b, 1, 2], 3
# # convert o.each to an external iterator for
# # implementing an internal iterator.
# puts ext_each(o.to_enum) {|*x| puts x; [:b, *x] }
# # => [], [:b], [1], [:b, 1], [1, 2], [:b, 1, 2], 3
#
# @mrbgem mruby-enumerator
class Enumerator
include Enumerable
##
# call-seq:
# Enumerator.new(size = nil) { |yielder| ... }
# Enumerator.new(obj, method = :each, *args)
# @overload initialize(size = nil, &block)
# @overload initialize(obj, method = :each, *args)
#
# Creates a new Enumerator object, which can be used as an
# Enumerable.
......@@ -101,15 +100,15 @@ class Enumerator
# which a "yielder" object, given as block parameter, can be used to
# yield a value by calling the +yield+ method (aliased as +<<+):
#
# fib = Enumerator.new do |y|
# a = b = 1
# loop do
# y << a
# a, b = b, a + b
# fib = Enumerator.new do |y|
# a = b = 1
# loop do
# y << a
# a, b = b, a + b
# end
# end
# end
#
# p fib.take(10) # => [1, 1, 2, 3, 5, 8, 13, 21, 34, 55]
# p fib.take(10) # => [1, 1, 2, 3, 5, 8, 13, 21, 34, 55]
#
def initialize(obj=nil, meth=:each, *args, &block)
if block_given?
......@@ -189,8 +188,7 @@ class Enumerator
#
# If no block is given, returns a new Enumerator.
#
# === Example
#
# @example
# to_three = Enumerator.new do |y|
# 3.times do |x|
# y << x
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment