Jira (PUP-9568) Migrate merge() from stdlib and make it support iterative creation of hash

[Henrik Lindberg (JIRA)]

Title: Message Title

Henrik Lindberg created an issue   Puppet / PUP-9568 Migrate merge() from stdlib and make it support iterative creation of hash Issue Type: Improvement Assignee: Unassigned Created: 2019/03/19 8:12 AM Priority: Normal Reporter: Henrik Lindberg I think we should migrate the merge() function from stdlib to puppet and teach it new tricks. Currently it only merges two hashes - it should instead be allowed to iterate over a hash or array and yield to a lambda that computes entries to merge - either by returning a hash, or an array that can be converted to a Hash. Returning undef adds nothing. This is of value since the only option in puppet to iteratively building a hash is via the reduce function (or by first creating an array - with similar issues) and it does not perform well if used to build a large hash (it will create a new copy of the hash it is building on each iteration). The lambda should be called with the hash built to this point (to allow reading it). $input = [a, b, c, d, c, b, b, a] $input.merge |$hsh, $val| { { $val => $hsh[$val].lest || { 0 } + 1} } Would build a hash with a count per occurence of string in an array. The example would produce: { a => 2, b => 3, c=> 2, d => 1 } Add Comment   This message was sent by Atlassian JIRA (v7.7.1#77002-sha1:e75ca93) -- You received this message because you are subscribed to the Google Groups "Puppet Bugs" group. To unsubscribe from this group and stop receiving emails from it, send an email to puppet-bugs+unsubscr...@googlegroups.com. To post to this group, send email to puppet-bugs@googlegroups.com. Visit this group at https://groups.google.com/group/puppet-bugs. For more options, visit https://groups.google.com/d/optout.