diff --git a/src/annotation/lineAnnotation.js b/src/annotation/lineAnnotation.js
index 424f574761..fa6739c7dd 100644
--- a/src/annotation/lineAnnotation.js
+++ b/src/annotation/lineAnnotation.js
@@ -42,8 +42,7 @@ var lineAnnotation = function (args) {
       line: function (d) {
         /* Return an array that has the same number of items as we have
          * vertices. */
-        return Array.apply(null, Array(m_this.options('vertices').length)).map(
-          function () { return d; });
+        return Array(m_this.options('vertices').length).fill(d);
       },
       position: function (d, i) {
         return m_this.options('vertices')[i];
@@ -53,8 +52,7 @@ var lineAnnotation = function (args) {
       line: function (d) {
         /* Return an array that has the same number of items as we have
          * vertices. */
-        return Array.apply(null, Array(m_this.options('vertices').length)).map(
-          function () { return d; });
+        return Array(m_this.options('vertices').length).fill(d);
       },
       position: function (d, i) {
         return m_this.options('vertices')[i];
diff --git a/src/annotation/polygonAnnotation.js b/src/annotation/polygonAnnotation.js
index 0e8df9947e..337d2782bc 100644
--- a/src/annotation/polygonAnnotation.js
+++ b/src/annotation/polygonAnnotation.js
@@ -43,7 +43,9 @@ var polygonAnnotation = function (args) {
     return new polygonAnnotation(args);
   }
 
-  args = util.deepMerge({}, this.constructor.defaults, {
+  var m_this = this;
+
+  args = util.deepMerge({
     style: {
       polygon: function (d) { return d.polygon; }
     },
@@ -52,12 +54,11 @@ var polygonAnnotation = function (args) {
         const coord = m_this._coordinates();
         /* Return an array that has the same number of items as we have
          * vertices. */
-        return Array.apply(null, Array((coord.outer || coord).length)).map(
-          function () { return d; });
+        return Array((coord.outer || coord).length).fill(d);
       },
       position: function (d, i) {
         if (d.x !== undefined) {
-          return d.x;
+          return d;
         }
         return m_this.options('vertices')[i];
       }
@@ -65,13 +66,12 @@ var polygonAnnotation = function (args) {
     cursorStyle: {
       position: util.identityFunction
     }
-  }, args);
+  }, this.constructor.defaults, args);
   args.vertices = args.vertices || args.coordinates || [];
   delete args.coordinates;
   annotation.call(this, 'polygon', args);
 
-  var m_this = this,
-      s_actions = this.actions,
+  var s_actions = this.actions,
       s_state = this.state;
 
   /**
diff --git a/src/util/common.js b/src/util/common.js
index 065980688d..5f2c9e3d3e 100644
--- a/src/util/common.js
+++ b/src/util/common.js
@@ -1011,15 +1011,15 @@ var util = {
         }
         const copy = source[key];
         if (copy && typeof copy === 'object' && (copy.constructor === Object || Array.isArray(copy))) {
-          let src = target[key];
+          let value = target[key];
           if (!Array.isArray(copy)) {
-            if (typeof src !== 'object' || Array.isArray(src)) {
-              src = {};
+            if (typeof value !== 'object' || Array.isArray(value)) {
+              value = {};
             }
-          } else if (!Array.isArray(src)) {
-            src = [];
+          } else if (!Array.isArray(value)) {
+            value = [];
           }
-          target[key] = util.deepMerge(src, copy);
+          target[key] = util.deepMerge(value, copy);
         } else if (copy !== undefined) {
           target[key] = copy;
         }