making arrays first and last more relaxed as well as allow nil comparison

Author: khash

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    c66-copper (0.0.4)
+    c66-copper (0.0.5)
       colorize (~> 0.8)
       ipaddress (~> 0.8)
       json (~> 1.4)

lib/copper/comparison.rb

@@ -6,7 +6,8 @@ def value(vars = {})
 			comp_op = elements[1].value(vars)
 			rhs = elements[2].value(vars)
 
-			raise ParseError, "cannot compare nil" if rhs.nil? || lhs.nil?
+			return true if rhs.nil? && lhs.nil?
+			return false if rhs.nil? || lhs.nil?
 
 			puts "[DEBUG] Comparing #{lhs} (#{lhs.class.name}) #{comp_op} #{rhs} (#{rhs.class.name})" if $debug
 			begin

lib/copper/data_types/array.rb

@@ -7,12 +7,12 @@ def count
 			end
 
 			def first
-				raise RuntimeError, "cannot call first on an empty array" if @value.empty?
+				return nil if @value.empty?
 				return @value.first
 			end
 
 			def last
-				raise RuntimeError, "cannot call last on an empty array" if @value.empty?
+				return nil if @value.empty?
 				return @value.last
 			end
 

lib/copper/version.rb

@@ -1,5 +1,5 @@
 module Copper
-	VERSION = '0.0.5'
+	VERSION = '0.0.6'
 	COPYRIGHT_MESSAGE = "(c) 2018 Cloud66 Inc."
 	APP_NAME = 'Copper'
 end