[ruby-core:33627] Re: Why is SyncEnumerator in REXML?

On Dec 7, 2010, at 3:41 PM, Asher wrote:

> Would your preference be to direct them to manually iterate each of the enumerators or create their own convenience class? Seems easy enough, but given that SyncEnumerator is there it made sense to me to leave it and move it into the main extension branch.

Enumerator should be used for this now, as I explained before:

>> enums = [1..3, %w[a b c]].map(&:each)
=> [#<Enumerator: 1..3:each>, #<Enumerator: ["a", "b", "c"]:each>]
>> loop do
?>   break if enums.all? { |e| e.peek && false rescue true }
>>   puts enums.map { |e| e.next rescue nil }.join(", ")
>> end
1, a
2, b
3, c
=> nil

or:

>> enums = [1..3, %w[a b c]]
=> [1..3, ["a", "b", "c"]]
>> se = enums[0].to_enum(:zip, *enums[1..-1])
=> #<Enumerator: 1..3:zip(["a", "b", "c"])>
>> loop do
?>   puts se.next.join(", ")
>> end
1, a
2, b
3, c
=> nil

James Edward Gray II