Add project 1 to git project.

jdzak · Nov 10, 2008 · 4a13dab · 4a13dab
commit 4a13dab
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diff --git a/integer.rb b/integer.rb
@@ -0,0 +1,7 @@
+class Integer
+  def multiples(range)
+    range.select do |num|
+      num % self == 0
+    end
+  end
+end
diff --git a/integer_spec.rb b/integer_spec.rb
@@ -0,0 +1,7 @@
+require 'integer'
+describe Integer do
+  it "should return multiples of 3 for all natural numbers up to 9" do
+    multiples = 3.multiples(1..9)
+    multiples.should == [3,6,9]
+  end
+ end
diff --git a/problem1.rb b/problem1.rb
@@ -0,0 +1,9 @@
+require 'integer'
+
+multiples_of_3 = 3.multiples(1..999)
+multiples_of_5 =  5.multiples(1..999)
+multiples_of_3.each { |num| multiples_of_3.delete(num) if multiples_of_5.include?(num) }
+
+sum = (multiples_of_3 + multiples_of_5).inject {|sum, multiple| sum + multiple }
+puts sum
+