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Add koan addressing Hash#fetch.
author
Dan Dorman
<dan.dorman@gmail.com>
Thu, 8 Sep 2011 15:46:02 +0000
(09:46 -0600)
committer
Dan Dorman
<dan.dorman@gmail.com>
Thu, 8 Sep 2011 15:46:02 +0000
(09:46 -0600)
koans/about_hashes.rb
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diff --git
a/koans/about_hashes.rb
b/koans/about_hashes.rb
index
2324b04
..
7662488
100644
(file)
--- 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"