diff --git a/_js/behaviors/dismiss.js b/_js/behaviors/dismiss.js
new file mode 100644
index 000000000..f0d283d6a
--- /dev/null
+++ b/_js/behaviors/dismiss.js
@@ -0,0 +1,21 @@
+import closest from 'dom101/closest'
+import remove from 'dom101/remove'
+import on from 'dom101/on'
+import { getData } from '../helpers/data'
+import onmount from 'onmount'
+
+/**
+ * Dismiss button
+ */
+
+onmount('[data-js-dismiss]', function () {
+  const parent = closest(this, '[data-js-dismissable]')
+  const dismissable = getData(parent, 'js-dismissable')
+  const id = dismissable && dismissable.id || ''
+
+  on(this, 'click', e => {
+    Dismiss.setDismissed(id)
+    e.preventDefault()
+    if (parent) remove(parent)
+  })
+})
diff --git a/_js/behaviors/dismissable.js b/_js/behaviors/dismissable.js
new file mode 100644
index 000000000..f2708f4ee
--- /dev/null
+++ b/_js/behaviors/dismissable.js
@@ -0,0 +1,17 @@
+import onmount from 'onmount'
+import remove from 'dom101/remove'
+import removeClass from 'dom101/remove-class'
+
+import { getData } from '../helpers/data'
+import { isDismissed } from '../helpers/dismiss'
+import { isPreview } from '../helpers/preview'
+
+onmount('[data-js-dismissable]', function () {
+  const id = getData(this, 'js-dismissable').id || ''
+
+  if (isPreview() || isDismissed(id)) {
+    remove(this)
+  } else {
+    removeClass(this, '-hide')
+  }
+})
diff --git a/_js/behaviors/disqus.js b/_js/behaviors/disqus.js
new file mode 100644
index 000000000..b0d8c0c65
--- /dev/null
+++ b/_js/behaviors/disqus.js
@@ -0,0 +1,17 @@
+import onmount from 'onmount'
+import injectDisqus from '../helpers/inject_disqus'
+
+/**
+ * Injects Disqus onto the page.
+ */
+
+onmount('[data-js-disqus]', function () {
+  const data = JSON.parse(this.getAttribute('data-js-disqus'))
+
+  window.disqus_config = function () {
+    this.page.url = data.url
+    this.page.identifier = data.identifier
+  }
+
+  injectDisqus(data.host)
+})
diff --git a/_js/behaviors/no-preview.js b/_js/behaviors/no-preview.js
index 4bf5fe67c..bbcc53b23 100644
--- a/_js/behaviors/no-preview.js
+++ b/_js/behaviors/no-preview.js
@@ -3,12 +3,14 @@ import ready from 'dom101/ready'
 import remove from 'dom101/remove'
 import onmount from 'onmount'
 
+import { isPreview } from '../helpers/preview'
+
 /*
  * Behavior: Things to remove when preview mode is on
  */
 
 onmount('[data-js-no-preview]', function (b) {
-  if (~window.location.search.indexOf('preview=1')) {
+  if (isPreview()) {
     remove(this)
   }
 })
diff --git a/_js/behaviors/searchable-item.js b/_js/behaviors/searchable-item.js
new file mode 100644
index 000000000..e6c1869dc
--- /dev/null
+++ b/_js/behaviors/searchable-item.js
@@ -0,0 +1,12 @@
+
+import $ from 'jquery'
+import onmount from 'onmount'
+import permutate from '../helpers/permutate'
+
+onmount('[data-js-searchable-item]', function () {
+  const $this = $(this)
+  const data = $this.data('js-searchable-item')
+  const words = permutate(data)
+
+  $this.attr('data-search-index', words.join(' '))
+})
diff --git a/_js/helpers/data.js b/_js/helpers/data.js
new file mode 100644
index 000000000..2e74e4285
--- /dev/null
+++ b/_js/helpers/data.js
@@ -0,0 +1,20 @@
+/**
+ * Stores and retrieves data from an element. Works like jQuery.data().
+ */
+
+export function data (el, key, val) {
+  if (typeof val !== 'undefined') {
+    return getData(el, key)
+  } else {
+    return setData(el, key, val)
+  }
+}
+
+export function getData (el, key) {
+  const str = el.getAttribute('data-' + key)
+  return JSON.parse(str || '{}')
+}
+
+export function setData (el, key, val) {
+  el.setAttribute('data-' + key, JSON.stringify(val))
+}
diff --git a/_js/helpers/dismiss.js b/_js/helpers/dismiss.js
new file mode 100644
index 000000000..b629d2b71
--- /dev/null
+++ b/_js/helpers/dismiss.js
@@ -0,0 +1,28 @@
+import * as Store from './store'
+
+/**
+ * Dismisses an announcement.
+ *
+ * @example
+ *     setDismissed('2017-09-02-happy-birthday')
+ */
+
+export function setDismissed (id) {
+  Store.update('dismissed', function (data) {
+    data[id] = true
+    return data
+  })
+}
+
+/**
+ * Checks if an announcement has been dismissed before.
+ *
+ * @example
+ *     setDismissed('2017-09-02-happy-birthday')
+ *     isDismissed('2017-09-02-happy-birthday') => true
+ */
+
+export function isDismissed (id) {
+  const data = Store.fetch('dismissed')
+  return data && data[id]
+}
diff --git a/_js/helpers/inject_disqus.js b/_js/helpers/inject_disqus.js
new file mode 100644
index 000000000..48fbeb5d5
--- /dev/null
+++ b/_js/helpers/inject_disqus.js
@@ -0,0 +1,14 @@
+/**
+ * Injects disqus's scripts into the page.
+ *
+ * @example
+ *     injectDisqus('devhints.disqus.com')
+ */
+
+export default function injectDisqus (host) {
+  var d = document, s = d.createElement('script')
+  s.src = 'https://' + host + '/embed.js'
+  s.setAttribute('data-timestamp', +new Date())
+  ;(d.head || d.body).appendChild(s)
+}
+
diff --git a/_js/helpers/permutate.js b/_js/helpers/permutate.js
new file mode 100644
index 000000000..c440b9077
--- /dev/null
+++ b/_js/helpers/permutate.js
@@ -0,0 +1,71 @@
+/**
+ * Permutates a searcheable item.
+ *
+ *     permutate({
+ *       slug: 'hello-world',
+ *       category: 'greetings'
+ *     })
+ */
+
+export default function permutate (data) {
+  let words = []
+  if (data.slug) {
+    words = words.concat(permutateString(data.slug))
+  }
+  if (data.category) {
+    words = words.concat(permutateString(data.category))
+  }
+  return words
+}
+
+/*
+ * Permutates strings.
+ *
+ * @example
+ *     permutateString('hi joe')
+ *     => ['h', 'hi', 'j', 'jo', 'joe']
+ */
+
+export function permutateString (str) {
+  let words = []
+  let inputs = splitwords(str)
+
+  inputs.forEach(word => {
+    words = words.concat(permutateWord(word))
+  })
+
+  return words
+}
+
+/**
+ * Permutates a word.
+ *
+ * @example
+ *     permutateWord('hello')
+ *     => ['h', 'he', 'hel', 'hell', 'hello']
+ */
+
+export function permutateWord (str) {
+  let words = []
+  const len = str.length
+  for (var i = 1; i <= len; ++i) {
+    words.push(str.substr(0, i))
+  }
+  return words
+}
+
+/**
+ * Helper for splitting to words.
+ *
+ * @example
+ *     splitWords('Hello, world!')
+ *     => ['hello', 'world']
+ */
+
+export function splitwords (str) {
+  const words = str.toLowerCase()
+    .split(/[ \/\-_]/)
+    .filter(k => k && k.length !== 0)
+
+  return words
+}
diff --git a/_js/helpers/preview.js b/_js/helpers/preview.js
new file mode 100644
index 000000000..670c09c68
--- /dev/null
+++ b/_js/helpers/preview.js
@@ -0,0 +1,7 @@
+/**
+ * Checks if we're in preview mode (?preview=1).
+ */
+
+export function isPreview () {
+  return window.location.search.indexOf('preview=1') !== -1
+}
diff --git a/_js/helpers/store.js b/_js/helpers/store.js
new file mode 100644
index 000000000..8da6af718
--- /dev/null
+++ b/_js/helpers/store.js
@@ -0,0 +1,29 @@
+/**
+ * Updates a local storage key. If it doesn't exist, it defaults to an empty
+ * object.
+ *
+ * @example
+ *     update('dismissed', (data) => {
+ *       data.lol = true
+ *       return data
+ *     })
+ */
+
+export function update (key, fn) {
+  if (!window.localStorage) return
+  let data = JSON.parse(window.localStorage[key] || '{}')
+  data = fn(data)
+  window.localStorage[key] = JSON.stringify(data)
+}
+
+/**
+ * Fetches a local storage key.
+ *
+ * @example
+ *     const data = fetch('dismissed')
+ */
+
+export function fetch (key) {
+  if (!window.localStorage) return
+  return JSON.parse(window.localStorage[key] || '{}')
+}
diff --git a/assets/2017/script.js b/assets/2017/script.js
index 8cefebabb..f0d92b036 100644
--- a/assets/2017/script.js
+++ b/assets/2017/script.js
@@ -3,14 +3,6 @@
  */
 
 $(function () {
-  $('[data-js-searchable-item]').each(function () {
-    const $this = $(this)
-    const data = $this.data('js-searchable-item')
-    const words = permutate(data)
-
-    $this.attr('data-search-index', words.join(' '))
-  })
-
   // Propagate item search indices to headers
   $('[data-js-searchable-header]').each(function () {
     const $this = $(this)
@@ -65,100 +57,6 @@ $(function () {
   })
 })
 
-/*
- * Behavior: Disqus
- */
-
-$(function () {
-  $('[data-js-disqus]').each(function () {
-    const $this = $(this)
-    const data = $this.data('js-disqus')
-
-    window.disqus_config = function () {
-      this.page.url = data.url
-      this.page.identifier = data.identifier
-    }
-
-    injectDisqus(data.host)
-  })
-})
-
-/*
- * Behavior: dismiss button
- */
-
-$(function () {
-  $('[data-js-dismiss]').each(function () {
-    var $button = $(this)
-    var $parent = $button.closest('[data-js-dismissable]')
-    var id = $parent.data('js-dismissable').id || ''
-
-    $button.on('click', function (e) {
-      Dismiss.setDismissed(id)
-      e.preventDefault()
-      $parent.remove()
-    })
-  })
-
-  $('[data-js-dismissable]').each(function () {
-    var $this = $(this)
-    var id = $this.data('js-dismissable').id || ''
-    const isDismissed = Dismiss.isDismissed(id)
-    if (isDismissed || window.location.search.indexOf('preview') !== -1) {
-      $this.remove()
-    } else {
-      $this.removeClass('-hide')
-    }
-  })
-})
-
-/*
- * Helper: dismissed
- */
-
-const Dismiss = {
-  setDismissed: function (id) {
-    Store.update('dismissed', function (data) {
-      data[id] = true
-      return data
-    })
-  },
-
-  isDismissed: function (id) {
-    const data = Store.fetch('dismissed')
-    return data && data[id]
-  }
-}
-
-/*
- * Simple LocalStorage shim
- */
-
-const Store = {
-  update: function (key, fn) {
-    if (!window.localStorage) return
-    let data = JSON.parse(window.localStorage[key] || '{}')
-    data = fn(data)
-    window.localStorage[key] = JSON.stringify(data)
-  },
-
-  fetch: function (key) {
-    if (!window.localStorage) return
-    return JSON.parse(window.localStorage[key] || '{}')
-  }
-}
-
-/*
- * Helper: injects disqus
- */
-
-function injectDisqus (host) {
-  var d = document, s = d.createElement('script')
-  s.src = 'https://' + host + '/embed.js'
-  s.setAttribute('data-timestamp', +new Date())
-  ;(d.head || d.body).appendChild(s)
-}
-
 /*
  * Helper for splitting to words
  */
@@ -194,40 +92,6 @@ const Search = {
   }
 }
 
-/*
- * Permutator
- */
-
-function permutate (data) {
-  let words = []
-  if (data.slug) {
-    words = words.concat(permutateString(data.slug))
-  }
-  if (data.category) {
-    words = words.concat(permutateString(data.category))
-  }
-  return words
-}
-
-function permutateString (str) {
-  let words = []
-  let inputs = splitwords(str)
-
-  inputs.forEach(word => {
-    words = words.concat(permutateWord(word))
-  })
-
-  return words
-}
-
-function permutateWord (str) {
-  let words = []
-  const len = str.length
-  for (var i = 1; i <= len; ++i) {
-    words.push(str.substr(0, i))
-  }
-  return words
-}
 
 /*
  * Helper: minimal qs implementation