Performance: replace ruby methods with their faster alternatives (#949)

- Array#select.first is slower than Array#detect.

  - Array#shuffle.first is slower than Array#sample.

app/controllers/github_repos_controller.rb

@@ -34,9 +34,9 @@ class GithubReposController < ApplicationController
   end
 
   def fetched_repo_params
-    fetched_repo = @client.repositories.select do |repo|
+    fetched_repo = @client.repositories.detect do |repo|
       repo.id == permitted_attributes(GithubRepo)[:github_id_code].to_i
-    end.first
+    end
     {
       github_id_code: fetched_repo.id,
       user_id: current_user.id,

app/liquid_tags/glitch_tag.rb

@@ -57,7 +57,7 @@ class GlitchTag < LiquidTagBase
     params = options.map { |x| option_to_query_pair(x) }.compact
 
     # Deal with the file option if present or use default
-    file_option = options.select { |x| x.start_with?("file=") }.first
+    file_option = options.detect { |x| x.start_with?("file=") }
     path = file_option ? (file_option.sub! "file=", "") : "index.html"
     params.push ["path", path]
 

app/services/suggester/users/recent.rb

@@ -9,10 +9,10 @@ module Suggester
       def suggest
         users = if user.decorate.cached_followed_tag_names.any?
                   ((recent_producers(3) - [user]).
-                           shuffle.first(55) + tagged_producers).uniq
+                           sample(55) + tagged_producers).uniq
                 else
                   (recent_commenters(4, 30) + recent_top_producers - [user]).
-                    uniq.shuffle.first(50)
+                    uniq.sample(50)
                 end
         users
       end