batch: remove side effects

Author: juliangruber

lib/batch.js

@@ -1,17 +1,20 @@
 var encodeKey = require('./encode-key');
 var encodeValue = require('./encode-value');
 
-module.exports = function(ops, batchOptions, dbOptions){
-  ops.forEach(function(op){
-    op.key = encodeKey(op.key, [op, batchOptions, dbOptions]);
+module.exports = function(ops, optionObjects){
+  return ops.map(function(_op){
+    var localOptionObjects = [_op].concat(optionObjects);
 
-    if ('value' in op) {
-      op.value = encodeValue(op.value, [op, batchOptions, dbOptions]);
+    var op = {
+      type: _op.type,
+      key: encodeKey(_op.key, localOptionObjects)
+    };
+
+    if ('value' in _op) {
+      op.value = encodeValue(_op.value, localOptionObjects);
     }
 
-    delete op.keyEncoding;
-    delete op.valueEncoding;
-    delete op.encoding;
+    return op;
   });
 };