diff --git a/examples/pivot.js b/examples/pivot.js
index 5f6b199d..0be1891f 100644
--- a/examples/pivot.js
+++ b/examples/pivot.js
@@ -570,18 +570,18 @@
     return len;
   };
   pivotTableRenderer = function(pivotData) {
-    var aggregator, c, colKey, colKeys, cols, i, j, r, result, rowKey, rowKeys, rows, th, totalAggregator, tr, txt, val, x;
-    cols = pivotData.colAttrs;
-    rows = pivotData.rowAttrs;
+    var aggregator, c, colAttrs, colKey, colKeys, i, j, r, result, rowAttrs, rowKey, rowKeys, th, totalAggregator, tr, txt, val, x;
+    colAttrs = pivotData.colAttrs;
+    rowAttrs = pivotData.rowAttrs;
     rowKeys = pivotData.getRowKeys();
     colKeys = pivotData.getColKeys();
     result = $("<table class='table table-bordered pvtTable'>");
-    for (j in cols) {
-      if (!__hasProp.call(cols, j)) continue;
-      c = cols[j];
+    for (j in colAttrs) {
+      if (!__hasProp.call(colAttrs, j)) continue;
+      c = colAttrs[j];
       tr = $("<tr>");
-      if (parseInt(j) === 0 && rows.length !== 0) {
-        tr.append($("<th>").attr("colspan", rows.length).attr("rowspan", cols.length));
+      if (parseInt(j) === 0 && rowAttrs.length !== 0) {
+        tr.append($("<th>").attr("colspan", rowAttrs.length).attr("rowspan", colAttrs.length));
       }
       tr.append($("<th class='pvtAxisLabel'>").text(c));
       for (i in colKeys) {
@@ -590,26 +590,26 @@
         x = spanSize(colKeys, parseInt(i), parseInt(j));
         if (x !== -1) {
           th = $("<th class='pvtColLabel'>").text(colKey[j]).attr("colspan", x);
-          if (parseInt(j) === cols.length - 1 && rows.length !== 0) {
+          if (parseInt(j) === colAttrs.length - 1 && rowAttrs.length !== 0) {
             th.attr("rowspan", 2);
           }
           tr.append(th);
         }
       }
       if (parseInt(j) === 0) {
-        tr.append($("<th class='pvtTotalLabel'>").text("Totals").attr("rowspan", cols.length + (rows.length === 0 ? 0 : 1)));
+        tr.append($("<th class='pvtTotalLabel'>").text("Totals").attr("rowspan", colAttrs.length + (rowAttrs.length === 0 ? 0 : 1)));
       }
       result.append(tr);
     }
-    if (rows.length !== 0) {
+    if (rowAttrs.length !== 0) {
       tr = $("<tr>");
-      for (i in rows) {
-        if (!__hasProp.call(rows, i)) continue;
-        r = rows[i];
+      for (i in rowAttrs) {
+        if (!__hasProp.call(rowAttrs, i)) continue;
+        r = rowAttrs[i];
         tr.append($("<th class='pvtAxisLabel'>").text(r));
       }
       th = $("<th>");
-      if (cols.length === 0) {
+      if (colAttrs.length === 0) {
         th.addClass("pvtTotalLabel").text("Totals");
       }
       tr.append(th);
@@ -625,7 +625,7 @@
         x = spanSize(rowKeys, parseInt(i), parseInt(j));
         if (x !== -1) {
           th = $("<th class='pvtRowLabel'>").text(txt).attr("rowspan", x);
-          if (parseInt(j) === rows.length - 1 && cols.length !== 0) {
+          if (parseInt(j) === rowAttrs.length - 1 && colAttrs.length !== 0) {
             th.attr("colspan", 2);
           }
           tr.append(th);
@@ -645,7 +645,7 @@
     }
     tr = $("<tr>");
     th = $("<th class='pvtTotalLabel'>").text("Totals");
-    th.attr("colspan", rows.length + (cols.length === 0 ? 0 : 1));
+    th.attr("colspan", rowAttrs.length + (colAttrs.length === 0 ? 0 : 1));
     tr.append(th);
     for (j in colKeys) {
       if (!__hasProp.call(colKeys, j)) continue;
diff --git a/pivot.coffee b/pivot.coffee
index ce200a46..25ac3238 100644
--- a/pivot.coffee
+++ b/pivot.coffee
@@ -287,8 +287,8 @@ spanSize = (arr, i, j) ->
     return len
 
 pivotTableRenderer = (pivotData) ->
-    cols = pivotData.colAttrs
-    rows = pivotData.rowAttrs
+    colAttrs = pivotData.colAttrs
+    rowAttrs = pivotData.rowAttrs
     rowKeys = pivotData.getRowKeys()
     colKeys = pivotData.getColKeys()
 
@@ -296,32 +296,32 @@ pivotTableRenderer = (pivotData) ->
     result = $("<table class='table table-bordered pvtTable'>")
 
     #the first few rows are for col headers
-    for own j, c of cols
+    for own j, c of colAttrs
         tr = $("<tr>")
-        if parseInt(j) == 0 and rows.length != 0
+        if parseInt(j) == 0 and rowAttrs.length != 0
             tr.append $("<th>")
-                .attr("colspan", rows.length)
-                .attr("rowspan", cols.length)
+                .attr("colspan", rowAttrs.length)
+                .attr("rowspan", colAttrs.length)
         tr.append $("<th class='pvtAxisLabel'>").text(c)
         for own i, colKey of colKeys
             x = spanSize(colKeys, parseInt(i), parseInt(j))
             if x != -1
                 th = $("<th class='pvtColLabel'>").text(colKey[j]).attr("colspan", x)
-                if parseInt(j) == cols.length-1 and rows.length != 0
+                if parseInt(j) == colAttrs.length-1 and rowAttrs.length != 0
                     th.attr("rowspan", 2)
                 tr.append th
         if parseInt(j) == 0
             tr.append $("<th class='pvtTotalLabel'>").text("Totals")
-                .attr("rowspan", cols.length + (if rows.length ==0 then 0 else 1))
+                .attr("rowspan", colAttrs.length + (if rowAttrs.length ==0 then 0 else 1))
         result.append tr
 
     #then a row for row header headers
-    if rows.length !=0
+    if rowAttrs.length !=0
         tr = $("<tr>")
-        for own i, r of rows
+        for own i, r of rowAttrs
             tr.append $("<th class='pvtAxisLabel'>").text(r)
         th = $("<th>")
-        if cols.length ==0
+        if colAttrs.length ==0
             th.addClass("pvtTotalLabel").text("Totals")
         tr.append th
         result.append tr
@@ -333,7 +333,7 @@ pivotTableRenderer = (pivotData) ->
             x = spanSize(rowKeys, parseInt(i), parseInt(j))
             if x != -1
                 th = $("<th class='pvtRowLabel'>").text(txt).attr("rowspan", x)
-                if parseInt(j) == rows.length-1 and cols.length !=0
+                if parseInt(j) == rowAttrs.length-1 and colAttrs.length !=0
                     th.attr("colspan",2)
                 tr.append th
         for own j, colKey of colKeys
@@ -354,7 +354,7 @@ pivotTableRenderer = (pivotData) ->
     #finally, the row for col totals, and a grand total
     tr = $("<tr>")
     th = $("<th class='pvtTotalLabel'>").text("Totals")
-    th.attr("colspan", rows.length + (if cols.length == 0 then 0 else 1))
+    th.attr("colspan", rowAttrs.length + (if colAttrs.length == 0 then 0 else 1))
     tr.append th
     for own j, colKey of colKeys
         totalAggregator = pivotData.getAggregator([], colKey)