Leaves - Mariya

lib/binary_to_decimal.rb

@@ -5,5 +5,9 @@
 # Calculate  and return the decimal value for this binary number using
 # the algorithm you devised in class.
 def binary_to_decimal(binary_array)
-  raise NotImplementedError
+  decimal_total = 0
+  binary_array.each do |digit|
+    decimal_total = (decimal_total * 2) + digit
+  end
+  return decimal_total
 end

test/binary_to_decimal_test.rb

@@ -6,28 +6,28 @@
   it "From 10011001 to 153" do
     binary_array = [1, 0, 0, 1, 1, 0, 0, 1]
     expected_decimal = 153
-
+    
     binary_to_decimal(binary_array).must_equal expected_decimal
   end
-
+  
   it "From 00001101 to 13" do
     binary_array = [0, 0, 0, 0, 1, 1, 0, 1]
     expected_decimal = 13
-
+    
     binary_to_decimal(binary_array).must_equal expected_decimal
   end
-
+  
   it "From 10000000 to 128" do
     binary_array = [1, 0, 0, 0, 0, 0, 0, 0]
     expected_decimal = 128
-
+    
     binary_to_decimal(binary_array).must_equal expected_decimal
   end
-
+  
   it "From random binary to decimal" do
     binary_array = Array.new(8) { rand(0..1) }
     expected_decimal = binary_array.join.to_s.to_i(2)
-
+    
     binary_to_decimal(binary_array).must_equal expected_decimal
   end
 end