--- !ditz.rubyforge.org,2008-03-06/issue 
title: array index enum primitive guaranteeing correct array index order (even for sparse arrays)
desc: |-
  This primitive is needed e.g. for Array.prototype.forEach() which is required
  to enumerate in ascending array index order, and needs to skip non-existent
  elements.
  
  For arrays with an array part, it's easy to just run through the array part.
  
  For arrays without an array part we don't care about speed that much, but
  looping for every possible index and checking whether it exists is still too
  slow.  On the other hand, the normal enumeration primitive does not guarantee
  correct ordering when array part is missing.
  
  This primitive can be added as a flag to the ordinary enumeration primitive.
  The flag would enable sorting of the key list based on numerical value as a
  post-step.  The sorting algorithm can be optimized for the assumption that
  keys are usually in almost correct order.
  
  The primitive could also be used to fix JSON.stringify() PropertyList
  handling; stringify() is also required to use ascending array index order
  for PropertyList but does not currently do so.
type: :task
component: duk
release: v0.3
reporter: sva <sami.vaarala@iki.fi>
status: :closed
disposition: :fixed
creation_time: 2013-03-02 19:30:26.519339 Z
references: []

id: a28ade3e0769f104de4fc0f3ca3b75f123cf79df
log_events: 
- - 2013-03-02 19:30:26.706507 Z
  - sva <sami.vaarala@iki.fi>
  - created
  - ""
- - 2013-03-11 12:35:51.031749 Z
  - sva <sami.vaarala@iki.fi>
  - assigned to release v0.3 from v0.4
  - ""
- - 2013-03-11 12:35:55.607784 Z
  - sva <sami.vaarala@iki.fi>
  - closed with disposition fixed
  - ""