Use switch/when statement

app/assets/javascripts/notes.js.coffee

@@ -106,30 +106,33 @@ class @Notes
     $textarea = $(e.target)
 
     # Edit previous note when UP arrow is hit
-    if $textarea.val() is '' and e.which is 38
-      myLastNote = $("li.note[data-author-id='#{gon.current_user_id}'][data-editable]:last")
-      if myLastNote.length
-        myLastNoteEditBtn = myLastNote.find('.js-note-edit')
-        myLastNoteEditBtn.trigger('click', [true, myLastNote])
+    switch e.which
+      when 38
+        return unless $textarea.val() is ''
 
-    # Cancel creating diff note or editing any note when ESCAPE is hit
-    if e.which is 27
-      discussionNoteForm = $textarea.closest('.js-discussion-note-form')
-      if discussionNoteForm.length
-        if $textarea.val() isnt ''
-          return unless confirm('Are you sure you want to cancel creating this comment?')
+        myLastNote = $("li.note[data-author-id='#{gon.current_user_id}'][data-editable]:last")
+        if myLastNote.length
+          myLastNoteEditBtn = myLastNote.find('.js-note-edit')
+          myLastNoteEditBtn.trigger('click', [true, myLastNote])
 
-        @removeDiscussionNoteForm(discussionNoteForm)
-        return
+      # Cancel creating diff note or editing any note when ESCAPE is hit
+      when 27
+        discussionNoteForm = $textarea.closest('.js-discussion-note-form')
+        if discussionNoteForm.length
+          if $textarea.val() isnt ''
+            return unless confirm('Are you sure you want to cancel creating this comment?')
 
-      editNote = $textarea.closest(".note")
-      if editNote.length
-        originalText = $textarea.closest('form').data('original-note')
-        newText = $textarea.val()
-        if originalText isnt newText
-          return unless confirm('Are you sure you want to cancel editing this comment?')
+          @removeDiscussionNoteForm(discussionNoteForm)
+          return
 
-        @removeNoteEditForm(editNote)
+        editNote = $textarea.closest('.note')
+        if editNote.length
+          originalText = $textarea.closest('form').data('original-note')
+          newText = $textarea.val()
+          if originalText isnt newText
+            return unless confirm('Are you sure you want to cancel editing this comment?')
+
+          @removeNoteEditForm(editNote)
 
 
   isMetaKey = (e) ->
@@ -427,7 +430,7 @@ class @Notes
   ###
   cancelEdit: (e) =>
     e.preventDefault()
-    note = $(e.target).closest(".note")
+    note = $(e.target).closest('.note')
     @removeNoteEditForm(note)
 
   removeNoteEditForm: (note) ->