Enumerator::Product

< Enumerator 4 instance methods 1 class methods

Enumerator::Product generates a Cartesian product of any number of enumerable objects. Iterating over the product of enumerable objects is roughly equivalent to nested each_entry loops where the loop for the rightmost object is put innermost.

Example

innings = Enumerator::Product.new(1..9, ['top', 'bottom'])

innings.each do |i, h|
  p [i, h]
end
# [1, "top"]
# [1, "bottom"]
# [2, "top"]
# [2, "bottom"]
# [3, "top"]
# [3, "bottom"]
# ...
# [9, "top"]
# [9, "bottom"]

The method used against each enumerable object is each_entry instead of each so that the product of N enumerable objects yields an array of exactly N elements in each iteration.

When no enumerator is given, it calls a given block once yielding an empty argument list.

This type of objects can be created by Enumerator.product.

Class methods 1

.new

Instance methods 4

#each #inspect #rewind #size