Sha256: da28057cef42ff8964d9bd15bd161d776c7f5a66f46976f4fdd7da34d18f1faf
Contents?: true
Size: 1.16 KB
Versions: 7
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Stored size: 1.16 KB
Contents
# = Iteration
#
#
class It
attr_reader :index, :value, :prior, :after
def initialize(array)
@array = array
@index = 0
@value = array[0]
@prior = []
@after = array[1..-1]
end
def first? ; @index == 0 ; end
def last?
if Enumerable === self
nil
else
@index == @array.length
end
end
private
def next_iteration
@index += 1
@prior << @value
@value = @after.shift
end
end
class Array
# Iterate over each element of array using an iteration object.
#
# [1,2,3].each_iteration do |it|
# p it.index
# p it.value
# p it.first?
# p it.last?
# p it.prior
# p it.after
# end
#
# on each successive iteration produces:
#
# 0 1 2
# 1 2 3
# true false false
# false false true
# [] [1] [1,2]
# [2,3] [3] []
#
# CREDIT: Trans
def each_iteration
if block_given?
it = It.new(self)
each do |e|
yield(it)
it.send(:next_iteration)
end
else
return Enumerable::Enumerator.new(self, :each_iteration)
end
end
end
Version data entries
7 entries across 7 versions & 2 rubygems