Setting the class property

lib/challenge.rb

@@ -1,19 +1,34 @@
 require "time"
 
 class Challenge
-  attr_reader :earliest_time
-  attr_reader :latest_time
-  attr_reader :peak_year
+  attr_reader :earliest_time, :latest_time, :peak_year
 
+  # Initializer
   def initialize(file_path)
     @file_path = File.expand_path(file_path)
   end
 
+  # Parse method which sets the class properties
   def parse
-    # Parse the file located at @file_path and set three attributes:
-    #
-    # earliest_time: the earliest time contained within the data set
-    # latest_time: the latest time contained within the data set
-    # peak_year: the year with the most number of timestamps contained within the data set
+    all_rows = {}
+    peak = {}
+    # Parsing the file and iterating over the rows
+    File.open(@file_path, 'r').each_line do |row|
+      row_time = Time.parse(row)
+      all_rows[row_time.to_i] = row_time
+      # Check if year exists in the hash
+      if(peak.has_key?(row_time.year))
+          peak[row_time.year] += 1 # if exist Increase the count
+      else
+          peak[row_time.year] = 1 # if not assign the one
+      end
+    end
+
+    # Minimum timestamp in the all_rows will be earliest time
+    @earliest_time = all_rows[all_rows.keys.min]
+    # Maximum timestamp in the all_rows will be latest time
+    @latest_time = all_rows[all_rows.keys.max]
+    # Peak Year with maximum row counts
+    @peak_year = peak.key(peak.values.max)
   end
 end