Leticia Tran (Ampers) - Binary to Decimal

lib/binary_to_decimal.rb

@@ -1,9 +1,20 @@
-# A method named `binary_to_decimal` that receives as input an array of size 8.
-# The array is randomly filled with 0’s and 1’s.
-# The most significant bit is at index 0.
-# The least significant bit is at index 7.
-# Calculate  and return the decimal value for this binary number using
-# the algorithm you devised in class.
+# Transform a 8 bits number into a decimal number using a method based on the material covered in class.
+
+
+#_____Step 1:
+# Fill new array with 8 random numbers from 0 to 1.
+random_binary_number = []
+8.times {  random_binary_number << rand(0..1)}
+
+
+#_____Step 2:
 def binary_to_decimal(binary_array)
-  raise NotImplementedError
+  # Reverse array to facilitate the calculations:
+  binary_array = binary_array.reverse
+
+  # Loop trough each index of the reversed binary number and multiply it by 2 to the power of it's index.
+  sum = 0
+  8.times {|i| sum += binary_array[i] * (2 ** i)}
+
+  return sum
 end