Replace use of .inject with more efficient .each_with_object.

Author: jperville

lib/json/ld/compact.rb

@@ -218,7 +218,7 @@ def compact(element, property: nil)
         end
 
         # Re-order result keys
-        result.keys.kw_sort.inject({}) {|map, kk| map[kk] = result[kk]; map}
+        result.keys.kw_sort.each_with_object({}) {|kk, memo| memo[kk] = result[kk]}
       else
         # For other types, the compacted value is the element value
         #log_debug("compact") {element.class.to_s}

lib/json/ld/context.rb

@@ -1576,9 +1576,10 @@ def remove_base(iri)
     #
     # @return [Array<RDF::URI>]
     def mappings
-      term_definitions.inject({}) do |memo, (t,td)|
-        memo[t] = td ? td.id : nil
-        memo
+      {}.tap do |memo|
+        term_definitions.each_pair do |t,td|
+          memo[t] = td ? td.id : nil
+        end
       end
     end
 
@@ -1598,9 +1599,10 @@ def mapping(term)
     # @return [Array<String>]
     # @deprecated
     def languages
-      term_definitions.inject({}) do |memo, (t,td)|
-        memo[t] = td.language_mapping
-        memo
+      {}.tap do |memo|
+        term_definitions.each_pair do |t,td|
+          memo[t] = td.language_mapping
+        end
       end
     end
 

lib/json/ld/expand.rb

@@ -113,7 +113,7 @@ def expand(input, active_property, context, ordered: true)
 
         # Re-order result keys if ordering
         if ordered
-          output_object.keys.kw_sort.inject({}) {|map, kk| map[kk] = output_object[kk]; map}
+          output_object.keys.kw_sort.each_with_object({}) {|kk, memo| memo[kk] = output_object[kk]}
         else
           output_object
         end

lib/json/ld/frame.rb

@@ -264,10 +264,9 @@ def cleanup_preserve(input, bnodes_to_clear)
     #
     # @return all of the matched subjects.
     def filter_subjects(state, subjects, frame, flags)
-      subjects.inject({}) do |memo, id|
+      subjects.each_with_object({}) do |id, memo|
         subject = state[:graphMap][state[:graph]][id]
         memo[id] = subject if filter_subject(subject, frame, state, flags)
-        memo
       end
     end