diff --git a/app/assets/javascripts/columns_selector.js.coffee b/app/assets/javascripts/columns_selector.js.coffee
index 29b91224d..8a7f61208 100644
--- a/app/assets/javascripts/columns_selector.js.coffee
+++ b/app/assets/javascripts/columns_selector.js.coffee
@@ -1,6 +1,6 @@
 App.ColumnsSelector =
 
-  initColums: (name) ->
+  initColums: () ->
     App.ColumnsSelector.hideAll()
     c_value = App.ColumnsSelector.currentValue()
 
@@ -15,8 +15,6 @@ App.ColumnsSelector =
         $("#column_selector_" + column).prop("checked", true)
 
   initChecks: () ->
-    fields = $(".column-selecteable th[data-field]")
-    columns = []
     $(".column-selecteable th[data-field]").each ->
       field = $(this).data("field")
       text = $.trim($(this).text())
@@ -70,7 +68,7 @@ App.ColumnsSelector =
 
   initialize: ->
     App.ColumnsSelector.initChecks()
-    columns = App.ColumnsSelector.initColums($("#js-columns-selector").data("cookie"))
+    App.ColumnsSelector.initColums()
 
     $("#js-columns-selector").on
       click: (event) ->
diff --git a/app/assets/javascripts/comments.js.coffee b/app/assets/javascripts/comments.js.coffee
index 370ab7a53..d80ee6e0b 100644
--- a/app/assets/javascripts/comments.js.coffee
+++ b/app/assets/javascripts/comments.js.coffee
@@ -10,7 +10,7 @@ App.Comments =
     $("##{parent_id} .comment-children:first").prepend($(response_html))
     this.update_comments_count()
 
-  update_comments_count: (parent_id) ->
+  update_comments_count: ->
     $(".js-comments-count").each ->
       new_val = $(this).text().trim().replace /\d+/, (match) -> parseInt(match, 10) + 1
       $(this).text(new_val)
diff --git a/app/assets/javascripts/dashboard_graphs.js b/app/assets/javascripts/dashboard_graphs.js
index 22a52f3e9..ba71e5de4 100644
--- a/app/assets/javascripts/dashboard_graphs.js
+++ b/app/assets/javascripts/dashboard_graphs.js
@@ -263,7 +263,7 @@
   };
 
   ProposalGraph.prototype.formatXColumnValues = function () {
-    var i, l, parts;
+    var i, l;
 
     this.xColumnValues = this.xColumnValues.sort();
 
diff --git a/app/assets/javascripts/documentable.js.coffee b/app/assets/javascripts/documentable.js.coffee
index 035371834..2cfe3323a 100644
--- a/app/assets/javascripts/documentable.js.coffee
+++ b/app/assets/javascripts/documentable.js.coffee
@@ -6,7 +6,7 @@ App.Documentable =
     $.each inputFiles, (index, input) ->
       App.Documentable.initializeDirectUploadInput(input)
 
-    $("#nested-documents").on "cocoon:after-remove", (e, insertedItem) ->
+    $("#nested-documents").on "cocoon:after-remove", ->
       App.Documentable.unlockUploads()
 
     $("#nested-documents").on "cocoon:after-insert", (e, nested_document) ->
diff --git a/app/assets/javascripts/gettext.js.coffee b/app/assets/javascripts/gettext.js.coffee
index 52ae42375..4d9700921 100644
--- a/app/assets/javascripts/gettext.js.coffee
+++ b/app/assets/javascripts/gettext.js.coffee
@@ -19,7 +19,7 @@ i18n = {
   }
 }
 
-window.Gettext = (key) ->
+window.Gettext = ->
   gettext: (key) ->
     locale_id = $("html").attr("lang")
     locale    = i18n[locale_id]
diff --git a/app/assets/javascripts/imageable.js.coffee b/app/assets/javascripts/imageable.js.coffee
index bdb71f4f9..7317c2b49 100644
--- a/app/assets/javascripts/imageable.js.coffee
+++ b/app/assets/javascripts/imageable.js.coffee
@@ -5,10 +5,10 @@ App.Imageable =
     $.each inputFiles, (index, input) ->
       App.Imageable.initializeDirectUploadInput(input)
 
-    $("#nested-image").on "cocoon:after-remove", (e, item) ->
+    $("#nested-image").on "cocoon:after-remove", ->
       $("#new_image_link").removeClass("hide")
 
-    $("#nested-image").on "cocoon:before-insert", (e, nested_image) ->
+    $("#nested-image").on "cocoon:before-insert", ->
       if $(".js-image-attachment").length > 0
         $(".js-image-attachment").closest(".image").remove()
 
diff --git a/app/assets/javascripts/legislation_allegations.js.coffee b/app/assets/javascripts/legislation_allegations.js.coffee
index 98dc36009..3a3f9ce4d 100644
--- a/app/assets/javascripts/legislation_allegations.js.coffee
+++ b/app/assets/javascripts/legislation_allegations.js.coffee
@@ -18,7 +18,7 @@ App.LegislationAllegations =
           App.LegislationAllegations.toggle_comments()
 
     $(".js-toggle-allegations").on
-      click: (e) ->
+      click: ->
         # Toggle comments when the section title is visible
         if !App.LegislationAnnotatable.isMobile()
           if $(this).find(".draft-panel .panel-title:visible").length == 0
diff --git a/app/assets/javascripts/legislation_annotatable.js.coffee b/app/assets/javascripts/legislation_annotatable.js.coffee
index ff6849d2c..ba5b445fa 100644
--- a/app/assets/javascripts/legislation_annotatable.js.coffee
+++ b/app/assets/javascripts/legislation_annotatable.js.coffee
@@ -1,5 +1,3 @@
-_t = (key) -> new Gettext().gettext(key)
-
 App.LegislationAnnotatable =
 
   makeEditableAndHighlight: (colour) ->
@@ -83,7 +81,7 @@ App.LegislationAnnotatable =
     return window.innerWidth <= 652
 
   viewerExtension: (viewer) ->
-    viewer._onHighlightMouseover = (event) ->
+    viewer._onHighlightMouseover = ->
       return
 
   customShow: (position) ->
@@ -106,7 +104,7 @@ App.LegislationAnnotatable =
           App.LegislationAnnotatable.highlight("#7fff9a")
           $("#comments-box textarea").focus()
 
-          $("#new_legislation_annotation").on("ajax:complete", (e, data, status, xhr) ->
+          $("#new_legislation_annotation").on("ajax:complete", (e, data) ->
             App.LegislationAnnotatable.app.destroy()
             if data.status == 200
               App.LegislationAnnotatable.remove_highlight()
@@ -127,7 +125,7 @@ App.LegislationAnnotatable =
     editor.show = App.LegislationAnnotatable.customShow
 
   scrollToAnchor: ->
-    annotationsLoaded: (annotations) ->
+    annotationsLoaded: ->
       anchor = $(location).attr("hash")
       if anchor && anchor.startsWith("#annotation")
         ann_id = anchor.split("-")[-1..]
@@ -183,7 +181,6 @@ App.LegislationAnnotatable =
 
     $(".legislation-annotatable").each ->
       $this          = $(this)
-      ann_type       = "legislation_draft_version"
       ann_id         = $this.data("legislation-draft-version-id")
       base_url       = $this.data("legislation-annotatable-base-url")
 
diff --git a/app/assets/javascripts/managers.js.coffee b/app/assets/javascripts/managers.js.coffee
index 60eab58e9..63218f2f5 100644
--- a/app/assets/javascripts/managers.js.coffee
+++ b/app/assets/javascripts/managers.js.coffee
@@ -14,11 +14,11 @@ App.Managers =
     $("#user_password").prop "type", type
 
   initialize: ->
-    $(".generate-random-value").on "click", (event) ->
+    $(".generate-random-value").on "click", ->
       password = App.Managers.generatePassword()
       $("#user_password").val(password)
 
-    $(".show-password").on "click", (event) ->
+    $(".show-password").on "click", ->
       if $("#user_password").is("input[type='password']")
         App.Managers.togglePassword("text")
       else
diff --git a/app/assets/javascripts/sortable.js.coffee b/app/assets/javascripts/sortable.js.coffee
index ee98703f3..1e24da891 100644
--- a/app/assets/javascripts/sortable.js.coffee
+++ b/app/assets/javascripts/sortable.js.coffee
@@ -1,7 +1,7 @@
 App.Sortable =
   initialize: ->
     $(".sortable").sortable
-      update: (event, ui) ->
+      update: ->
         new_order = $(this).sortable("toArray", { attribute: "data-answer-id" })
         $.ajax
           url: $(".sortable").data("js-url"),
@@ -9,7 +9,7 @@ App.Sortable =
           type: "POST"
 
     $(".sortable-priotirized-votation").sortable
-      update: (event, ui) ->
+      update: ->
         new_order = $(this).sortable("toArray", { attribute: "data-answer-id" })
         $.ajax
           url: $(this).data("js-url"),
diff --git a/app/assets/javascripts/stats.js.coffee b/app/assets/javascripts/stats.js.coffee
index 56987c27a..982d2f98e 100644
--- a/app/assets/javascripts/stats.js.coffee
+++ b/app/assets/javascripts/stats.js.coffee
@@ -4,7 +4,7 @@
 buildGraph = (el) ->
   url = $(el).data "graph"
   conf = bindto: el,  data: { x: "x", url: url, mimeType: "json" },  axis: { x: { type: "timeseries", tick: { format: "%Y-%m-%d" } } }
-  graph = c3.generate conf
+  c3.generate conf
 
 App.Stats =
   initialize: ->
diff --git a/app/assets/javascripts/tree_navigator.js.coffee b/app/assets/javascripts/tree_navigator.js.coffee
index bd7192caf..86fd240fd 100644
--- a/app/assets/javascripts/tree_navigator.js.coffee
+++ b/app/assets/javascripts/tree_navigator.js.coffee
@@ -20,7 +20,7 @@ App.TreeNavigator =
       App.TreeNavigator.setNodes(ul.children())
 
     $("[data-tree-navigator] span").on
-      click: (e) ->
+      click: ->
         elem = $(this)
         if(elem.hasClass("open"))
           elem.removeClass("open").addClass("closed")
diff --git a/app/assets/javascripts/watch_form_changes.js.coffee b/app/assets/javascripts/watch_form_changes.js.coffee
index 693a68d0e..740876506 100644
--- a/app/assets/javascripts/watch_form_changes.js.coffee
+++ b/app/assets/javascripts/watch_form_changes.js.coffee
@@ -6,7 +6,7 @@ App.WatchFormChanges =
     if($("[data-watch-form-message]").length)
       return $("[data-watch-form-message]").data("watch-form-message")
 
-  checkChanges: (event) ->
+  checkChanges: ->
     changes = false
     App.WatchFormChanges.forms().each ->
       form = $(this)
@@ -21,7 +21,7 @@ App.WatchFormChanges =
     if App.WatchFormChanges.forms().length == 0 || App.WatchFormChanges.msg() == undefined
       return
 
-    $(document).off("page:before-change").on("page:before-change", (e) -> App.WatchFormChanges.checkChanges(e))
+    $(document).off("page:before-change").on("page:before-change", -> App.WatchFormChanges.checkChanges())
 
     App.WatchFormChanges.forms().each ->
       form = $(this)