bst: batch op.

lib/bcoin/bst.js

@@ -610,7 +610,7 @@ function Batch(tree, options) {
 
 Batch.prototype.put = function(key, value) {
   assert(this.tree, 'Already written.');
-  this.ops.push({ type: 'put', key: key, value: value });
+  this.ops.push(new BatchOp('put', key, value));
   return this;
 };
 
@@ -621,7 +621,7 @@ Batch.prototype.put = function(key, value) {
 
 Batch.prototype.del = function del(key) {
   assert(this.tree, 'Already written.');
-  this.ops.push({ type: 'del', key: key });
+  this.ops.push(new BatchOp('del', key));
   return this;
 };
 
@@ -666,6 +666,21 @@ Batch.prototype.clear = function clear() {
   return this;
 };
 
+/**
+ * Batch Operation
+ * @constructor
+ * @private
+ * @param {String} type
+ * @param {Buffer} key
+ * @param {Buffer|null} value
+ */
+
+function BatchOp(type, key, value) {
+  this.type = type;
+  this.key = key;
+  this.value = value;
+}
+
 /**
  * Iterator
  * @constructor