add a function to return sorted Object keys to be used by values in plot-schema

Author: archmoj

src/lib/index.js

@@ -65,6 +65,8 @@ lib.roundUp = searchModule.roundUp;
 lib.sort = searchModule.sort;
 lib.findIndexOfMin = searchModule.findIndexOfMin;
 
+lib.sortedObjectKeys = require('./sorted_object_keys');
+
 var statsModule = require('./stats');
 lib.aggNums = statsModule.aggNums;
 lib.len = statsModule.len;

src/lib/sorted_object_keys.js

@@ -0,0 +1,5 @@
+'use strict';
+
+module.exports = function sortedObjectKeys(obj) {
+    return Object.keys(obj).sort();
+};