Run grunt.

dist/js/bootstrap.js

@@ -511,8 +511,7 @@ if (typeof jQuery === 'undefined') { throw new Error('Bootstrap\'s JavaScript re
 
     this.$element
       .removeClass('collapse')
-      .addClass('collapsing')
-      [dimension](0)
+      .addClass('collapsing')[dimension](0)
 
     this.transitioning = 1
 
@@ -520,8 +519,7 @@ if (typeof jQuery === 'undefined') { throw new Error('Bootstrap\'s JavaScript re
       if (e && e.target != this.$element[0]) return
       this.$element
         .removeClass('collapsing')
-        .addClass('collapse in')
-        [dimension]('auto')
+        .addClass('collapse in')[dimension]('auto')
       this.transitioning = 0
       this.$element.trigger('shown.bs.collapse')
     }
@@ -532,8 +530,7 @@ if (typeof jQuery === 'undefined') { throw new Error('Bootstrap\'s JavaScript re
 
     this.$element
       .one($.support.transition.end, $.proxy(complete, this))
-      .emulateTransitionEnd(350)
-      [dimension](this.$element[0][scrollSize])
+      .emulateTransitionEnd(350)[dimension](this.$element[0][scrollSize])
   }
 
   Collapse.prototype.hide = function () {
@@ -545,9 +542,7 @@ if (typeof jQuery === 'undefined') { throw new Error('Bootstrap\'s JavaScript re
 
     var dimension = this.dimension()
 
-    this.$element
-      [dimension](this.$element[dimension]())
-      [0].offsetHeight
+    this.$element[dimension](this.$element[dimension]())[0].offsetHeight
 
     this.$element
       .addClass('collapsing')