Add empty? predicate to Fields::Array

lib/rackstash/fields/array.rb

@@ -39,6 +39,10 @@ module Rackstash
         self
       end
 
+      def empty?
+        @raw.empty?
+      end
+
       def length
         @raw.length
       end

lib/rackstash/fields/hash.rb

@@ -45,6 +45,10 @@ module Rackstash
         self
       end
 
+      def empty?
+        @raw.empty?
+      end
+
       def keys
         @raw.keys
       end

spec/rackstash/fields/array_spec.rb

@@ -123,6 +123,16 @@ describe Rackstash::Fields::Array do
     end
   end
 
+  describe '#empty?' do
+    it 'returns true of there are any tags' do
+      expect(array.empty?).to be true
+      array[0] = 'foo'
+      expect(array.empty?).to be false
+      array.clear
+      expect(array.empty?).to be true
+    end
+  end
+
   describe '#length' do
     it 'returns the length of the array' do
       expect(array.length).to eql 0

spec/rackstash/fields/hash_spec.rb

@@ -160,6 +160,16 @@ describe Rackstash::Fields::Hash do
     end
   end
 
+  describe '#empty?' do
+    it 'returns true of there are any fields' do
+      expect(hash.empty?).to be true
+      hash['key'] = 'foo'
+      expect(hash.empty?).to be false
+      hash.clear
+      expect(hash.empty?).to be true
+    end
+  end
+
   describe '#forbidden_key?' do
     let(:forbidden_keys) { ['forbidden', :foo] }