From: Dan Dorman <dan.dorman@gmail.com>
Date: Thu, 8 Sep 2011 15:46:02 +0000 (-0600)
Subject: Add koan addressing Hash#fetch.
X-Git-Url: https://git.eng.unimelb.edu.au/public?p=ruby_koans.git;a=commitdiff_plain;h=7c34268f848a359132874a285acc54cb704216c9

Add koan addressing Hash#fetch.
---

diff --git a/koans/about_hashes.rb b/koans/about_hashes.rb
index 2324b04..7662488 100644
--- a/koans/about_hashes.rb
+++ b/koans/about_hashes.rb
@@ -20,6 +20,18 @@ class AboutHashes < EdgeCase::Koan
     assert_equal __, hash[:doesnt_exist]
   end
 
+  def test_accessing_hashes_with_fetch
+    hash = { :one => "uno" }
+    assert_equal "uno", hash.fetch(:one)
+    assert_raise(___) do
+      hash.fetch(:doesnt_exist)
+    end
+
+    # THINK ABOUT IT:
+    #
+    # Why might you want to use #fetch instead of #[] when accessing hash keys?
+  end
+
   def test_changing_hashes
     hash = { :one => "uno", :two => "dos" }
     hash[:one] = "eins"