manveru · December 18, 2015 03:19 · Jun 5, 2013 · Feb 25, 2013
diff --git a/gistfile1 b/gistfile1
@@ -1,20 +0,0 @@
-#!/usr/bin/ruby
-
-# This program adds up the numbers 1 through 10,000 using 100 threads.
-
-# Challenge A: Does this solution have any problems? If so, explain.
-# Challenge B: Propose an alternate implementation that does not use threads.
-
-require "thread"
-
-mt_result = 0
-100.times.map do |n|
-  Thread.new do
-    base = 1 + (n * 100)
-    100.times do |i|
-      mt_result += base + i
-    end
-  end
-end.map(&:join)
-
-puts "The multi-threaded result is: #{mt_result}"

diff --git a/thread_sum.rb b/thread_sum.rb
@@ -0,0 +1,16 @@
+#!/usr/bin/env ruby
+
+threads = 100.times.map do |n|
+  Thread.new n do |m|
+    base = 1 + (m * 100)
+    100.times.map do |i|
+      base + i
+    end
+  end
+end
+
+result = threads.reduce(0) do |sum, thread|
+  sum + thread.join.value.reduce(:+)
+end
+
+puts "The multi-threaded result is: #{result}"
diff --git a/gistfile1 b/gistfile1
@@ -0,0 +1,20 @@
+#!/usr/bin/ruby
+
+# This program adds up the numbers 1 through 10,000 using 100 threads.
+
+# Challenge A: Does this solution have any problems? If so, explain.
+# Challenge B: Propose an alternate implementation that does not use threads.
+
+require "thread"
+
+mt_result = 0
+100.times.map do |n|
+  Thread.new do
+    base = 1 + (n * 100)
+    100.times do |i|
+      mt_result += base + i
+    end
+  end
+end.map(&:join)
+
+puts "The multi-threaded result is: #{mt_result}"