Jira (PUP-5729) Add a reverse_each function

Henrik Lindberg (JIRA) Wed, 03 Feb 2016 13:04:45 -0800

Title: Message Title

PUP-5729

Yes, (single namespace is a PITA). You got it right, returning an Iterator makes things chainable without having to produce intermediate array copies. We allow the Iterator to be passed around (it is a subtype of Iterable), but we do not allow it to be passed to 3.x functions, nor as a parameter value in defines or classes since it cannot really be serialized without first rolling out the iteration to an Array - which you have to do manually atm. We may do automatically in the future (i.e. on assignment to a slot that will be serialized, or in the serialization itself).

These both produce an Array that is the reverse of the LHS.

$arr.reverse_each |$x| { $x }

$arr.reverse_each.map |$x| { $x }

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Jira (PUP-5729) Add a reverse_each function

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