From cc7e8e3fbe89ce58fb1b7051f6a3aa1ac73ff698 Mon Sep 17 00:00:00 2001
From: skadilover <526389172@qq.com>
Date: Fri, 1 Apr 2016 13:43:33 +0800
Subject: [PATCH 1/2] add len  method

when data is not array or map, return error.
---
 simplejson.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/simplejson.go b/simplejson.go
index 27ce986..ad1cedc 100644
--- a/simplejson.go
+++ b/simplejson.go
@@ -444,3 +444,13 @@ func (j *Json) MustUint64(args ...uint64) uint64 {
 
 	return def
 }
+
+func (j *Json) Len() (int, error) {
+    if array, err := j.Array(); err == nil {
+        return len(array), nil
+    }
+    if m, err := j.Map(); err == nil {
+        return len(m), nil
+    }
+    return -1, errors.New("not array or map.")
+}

From 911ad23cbcfbff01a95f3fccdc91582f93131c3c Mon Sep 17 00:00:00 2001
From: skadilover <526389172@qq.com>
Date: Fri, 1 Apr 2016 13:50:00 +0800
Subject: [PATCH 2/2] Update simplejson.go

---
 simplejson.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/simplejson.go b/simplejson.go
index ad1cedc..8d77c3b 100644
--- a/simplejson.go
+++ b/simplejson.go
@@ -445,6 +445,7 @@ func (j *Json) MustUint64(args ...uint64) uint64 {
 	return def
 }
 
+//return len of j when j is array or map,it is useful when handle json rpcs
 func (j *Json) Len() (int, error) {
     if array, err := j.Array(); err == nil {
         return len(array), nil