No need for such micro-optimizations, LLVM takes care of those

src/ameba/ast/visitors/scope_visitor.cr

@@ -21,7 +21,6 @@ module Ameba::AST
     }
 
     SPECIAL_NODE_NAMES = %w[super previous_def]
-    RECORD_NODE_NAME   = "record"
 
     @scope_queue = [] of Scope
     @current_scope : Scope
@@ -190,7 +189,7 @@ module Ameba::AST
     end
 
     private def record_macro?(node)
-      node.name == RECORD_NODE_NAME && node.args.first?.is_a?(Crystal::Path)
+      node.name == "record" && node.args.first?.is_a?(Crystal::Path)
     end
 
     private def skip?(node)

src/ameba/rule/lint/not_nil.cr

@@ -32,15 +32,14 @@ module Ameba::Rule::Lint
       description "Identifies usage of `not_nil!` calls"
     end
 
-    NOT_NIL_NAME = "not_nil!"
+    MSG = "Avoid using `not_nil!`"
-    MSG          = "Avoid using `not_nil!`"
 
     def test(source)
       AST::NodeVisitor.new self, source, skip: :macro
     end
 
     def test(source, node : Crystal::Call)
-      return unless node.name == NOT_NIL_NAME
+      return unless node.name == "not_nil!"
       return unless node.obj && node.args.empty?
 
       return unless name_location = node.name_location

src/ameba/rule/lint/not_nil_after_no_bang.cr

@@ -30,15 +30,14 @@ module Ameba::Rule::Lint
     BLOCK_CALL_NAMES = %w(index rindex find)
     CALL_NAMES       = %w(index rindex)
 
-    NOT_NIL_NAME = "not_nil!"
+    MSG = "Use `%s! {...}` instead of `%s {...}.not_nil!`"
-    MSG          = "Use `%s! {...}` instead of `%s {...}.not_nil!`"
 
     def test(source)
       AST::NodeVisitor.new self, source, skip: :macro
     end
 
     def test(source, node : Crystal::Call)
-      return unless node.name == NOT_NIL_NAME && node.args.empty?
+      return unless node.name == "not_nil!" && node.args.empty?
       return unless (obj = node.obj).is_a?(Crystal::Call)
       return unless obj.name.in?(obj.block ? BLOCK_CALL_NAMES : CALL_NAMES)
 

src/ameba/rule/performance/any_after_filter.cr

@@ -32,11 +32,10 @@ module Ameba::Rule::Performance
       filter_names %w(select reject)
     end
 
-    ANY_NAME = "any?"
+    MSG = "Use `any? {...}` instead of `%s {...}.any?`"
-    MSG      = "Use `any? {...}` instead of `%s {...}.any?`"
 
     def test(source, node : Crystal::Call)
-      return unless node.name == ANY_NAME && (obj = node.obj)
+      return unless node.name == "any?" && (obj = node.obj)
       return unless obj.is_a?(Crystal::Call) && obj.block && node.block.nil?
       return unless obj.name.in?(filter_names)
 

src/ameba/rule/performance/any_instead_of_empty.cr

@@ -34,11 +34,10 @@ module Ameba::Rule::Performance
       description "Identifies usage of arg-less `any?` calls"
     end
 
-    ANY_NAME = "any?"
+    MSG = "Use `!{...}.empty?` instead of `{...}.any?`"
-    MSG      = "Use `!{...}.empty?` instead of `{...}.any?`"
 
     def test(source, node : Crystal::Call)
-      return unless node.name == ANY_NAME
+      return unless node.name == "any?"
       return unless node.block.nil? && node.args.empty?
       return unless node.obj
 

src/ameba/rule/performance/compact_after_map.cr

@@ -26,18 +26,16 @@ module Ameba::Rule::Performance
       description "Identifies usage of `compact` calls that follow `map`"
     end
 
-    COMPACT_NAME = "compact"
+    MSG = "Use `compact_map {...}` instead of `map {...}.compact`"
-    MAP_NAME     = "map"
-    MSG          = "Use `compact_map {...}` instead of `map {...}.compact`"
 
     def test(source)
       AST::NodeVisitor.new self, source, skip: :macro
     end
 
     def test(source, node : Crystal::Call)
-      return unless node.name == COMPACT_NAME && (obj = node.obj)
+      return unless node.name == "compact" && (obj = node.obj)
       return unless obj.is_a?(Crystal::Call) && obj.block
-      return unless obj.name == MAP_NAME
+      return unless obj.name == "map"
 
       issue_for obj.name_location, node.name_end_location, MSG
     end

src/ameba/rule/performance/flatten_after_map.cr

@@ -26,18 +26,16 @@ module Ameba::Rule::Performance
       description "Identifies usage of `flatten` calls that follow `map`"
     end
 
-    FLATTEN_NAME = "flatten"
+    MSG = "Use `flat_map {...}` instead of `map {...}.flatten`"
-    MAP_NAME     = "map"
-    MSG          = "Use `flat_map {...}` instead of `map {...}.flatten`"
 
     def test(source)
       AST::NodeVisitor.new self, source, skip: :macro
     end
 
     def test(source, node : Crystal::Call)
-      return unless node.name == FLATTEN_NAME && (obj = node.obj)
+      return unless node.name == "flatten" && (obj = node.obj)
       return unless obj.is_a?(Crystal::Call) && obj.block
-      return unless obj.name == MAP_NAME
+      return unless obj.name == "map"
 
       issue_for obj.name_location, node.name_end_location, MSG
     end

src/ameba/rule/performance/size_after_filter.cr

@@ -38,15 +38,14 @@ module Ameba::Rule::Performance
       filter_names %w(select reject)
     end
 
-    SIZE_NAME = "size"
+    MSG = "Use `count {...}` instead of `%s {...}.size`."
-    MSG       = "Use `count {...}` instead of `%s {...}.size`."
 
     def test(source)
       AST::NodeVisitor.new self, source, skip: :macro
     end
 
     def test(source, node : Crystal::Call)
-      return unless node.name == SIZE_NAME && (obj = node.obj)
+      return unless node.name == "size" && (obj = node.obj)
       return unless obj.is_a?(Crystal::Call) && obj.block
       return unless obj.name.in?(filter_names)