Don't convert all input to symbols during lookup

lib/rumoji.rb

@@ -13,7 +13,7 @@ module Rumoji
 
   # Transform a cheat-sheet code into an Emoji
   def decode(str)
-    str.gsub(/:([^\s:]?[\w-]+):/) {|sym| (Emoji.find($1.intern) || sym).to_s }
+    str.gsub(/:([^\s:]?[\w-]+):/) { |match| (Emoji.find($1) || match).to_s }
   end
 
   def encode_io(readable, writeable=StringIO.new(""))

lib/rumoji/emoji.rb

@@ -20,7 +20,7 @@ module Rumoji
     end
 
     def include?(symbol)
-      @cheat_codes.include? symbol.to_sym
+      @cheat_codes.map(&:to_s).include? symbol.to_s
     end
 
     def to_s
@@ -53,8 +53,11 @@ module Rumoji
 
     ALL_REGEXP = Regexp.new(ALL.map(&:string).join('|'))
 
+    FIND_BY_SYMBOL_CACHE = {}
+
     def self.find(symbol)
-      ALL.find {|emoji| emoji.include? symbol }
+      symbol = symbol.to_s
+      FIND_BY_SYMBOL_CACHE[symbol] ||= ALL.find { |emoji| emoji.include? symbol }
     end
 
     STRING_LOOKUP = ALL.each.with_object({}) do |emoji, lookup|

spec/rumoji/emoji_spec.rb

@@ -62,10 +62,14 @@ describe Rumoji::Emoji do
     let(:smile_str) { "\u{1F604}" }
     let(:smile_sym) { :smile }
 
-    it "finds an emoji from cheat sheet code" do
+    it "finds an emoji from cheat sheet code symbol" do
       subject.find(smile_sym).to_s.must_equal smile_str
     end
 
+    it "finds an emoji from cheat sheet code string" do
+      subject.find(smile_sym.to_s).to_s.must_equal smile_str
+    end
+
     it "finds an emoji from a string" do
       subject.find_by_string(smile_str).symbol.must_equal smile_sym
     end