Issue #6596 has been updated by trans (Thomas Sawyer).


=begin
@knu I think you have already pointed out the usecase. Wherever someone is using #each_with_index which contains a conditional selection would be a potential use case.

  even_indexes = []
  array_of_numbers.each_with_index do |c, i|
    next if c % 2 == 1
    even_indexes << i
  end

Basically #indexes is to #index as #select is to #find. We could do without #select too, but why would we?
=end

----------------------------------------
Bug #6596: New method for Arrays : Array#index
https://bugs.ruby-lang.org/issues/6596#change-27274

Author: robin850 (Robin Dupret)
Status: Feedback
Priority: Normal
Assignee: 
Category: core
Target version: 2.0.0
ruby -v: 2.0.0


Hello

5 days ago, I submitted a pull request on Github which provides a new method for the array objects which is Array#indexes. I have fist edit the Array#index method in order it to return an array of indexes and not a single index (which is the first occurrence it finds). I found it more logical but a user (trans) tells us that it could break the contract of Array#index so I decided to move it into Array#indexes. Eric (drbrain) tells me I should reasonning why I want to add this method ; it's just a point of view : I don't really understand why Array#index return a single index if the parameter is in the array several times. 

Examples

a = [1, 2, 3, 1]
a.indexes(1)
Return : [0, 3]
a.index(1)
Return : 0
In my opinion, it's not really logical, 1 is in the array twice

Moreover, this pull request doesn't beak anything because we don't edit the Array#index method so programms which were created with previous version of Ruby will work. 

I hope my post is complete. Have a nice day.




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