https://git.ruby-lang.org/ruby.git/commit/?id=fac4339a12

From fac4339a1273df64fe764579f0d3ccccf64b74b4 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Tue, 22 Oct 2019 19:39:42 +0900
Subject: NEWS: add an example for Lazy#eager


diff --git a/NEWS b/NEWS
index f29669a..8165b87 100644
--- a/NEWS
+++ b/NEWS
@@ -251,6 +251,15 @@ Enumerator:: https://github.com/ruby/ruby/blob/trunk/NEWS#L251
     * Added Enumerator::Lazy#eager that generates a non-lazy enumerator
       from a lazy enumerator.  [Feature #15901]
 
+        a = %w(foo bar baz)
+        e = a.lazy
+             .map {|x| p [x, :upcase]; x.upcase }
+             .map {|x| p [x, :add_bang]; x + "!" }
+             .eager
+        p e.next #=> ["foo", :upcase], ["FOO", :add_bang], "FOO!"
+        p e.next #=> ["bar", :upcase], ["BAR", :add_bang], "BAR!"
+        p e.next #=> ["baz", :upcase], ["BAZ", :add_bang], "BAZ!"
+
     * Added Enumerator::Yielder#to_proc so that a Yielder object
       can be directly passed to another method as a block
       argument.  [Feature #15618]
-- 
cgit v0.10.2


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