View source for Powers Of 2 Range Assignment

=Reference=
* [https://apidock.com/ruby/Proc/yield yield]
* [https://apidock.com/ruby/Kernel/block_given%3F block_given?]
* [https://www.rubydoc.info/stdlib/core/Object:to_enum to_enum]

=Code to Implement=
==PowersOfTwoRange==
{{RubyToImplement|powers_of_two_range|powers_of_two_range|PowersOfTwoRange|Object|initialize(maximum, inclusive: false)<br/>each<br/>each_with_index}}
===initialize(maximum, inclusive: false)===
hang onto enough information in instance variables to support each and each_with_index
===each===
if a block is given, repeatedly yield with appropriate value.

otherwise, return an enum via to_enum.

====exclusive client with block given====
 <nowiki>exclusive_powers_of_two = PowersOfTwoRange.new(64)
exclusive_powers_of_two.each do |n|
  puts n
end</nowiki>

outputs

 <nowiki>1
2
4
8
16
32</nowiki>

====inclusive client with block given====

 <nowiki>exclusive_powers_of_two = PowersOfTwoRange.new(64, inclusive: true)
exclusive_powers_of_two.each do |n|
  puts n
end</nowiki>

outputs

 <nowiki>1
2
4
8
16
32
64</nowiki>

====exclusive client without block====

 <nowiki>exclusive_powers_of_two = PowersOfTwoRange.new(64)
as_enum = exclusive_powers_of_two.each
p as_enum.to_a</nowiki>

outputs

 <nowiki>[1, 2, 4, 8, 16, 32]
</nowiki>

===each_with_index===
if a block is given, repeatedly yield with appropriate value and its index.

otherwise, return an enum via to_enum.
====exclusive client with block given====

 <nowiki>exclusive_powers_of_two = PowersOfTwoRange.new(64)
exclusive_powers_of_two.each_with_index do |n, index|
  puts "#{n}, #{index}"
end</nowiki>

outputs

 <nowiki>1, 0
2, 1
4, 2
8, 3
16, 4
32, 5</nowiki>

=Client=
{{RubyToRun|powers_of_two_range_client|powers_of_two_range_client|main}}

=Unit Test=
{{RubyUnitTest|powers_of_two_range|powers_of_two_range}}