Merge pull request #8 from mkeesey/master

Adding GetIndex() for traversing JSON Arrays

README.md

@@ -56,6 +56,15 @@ func (j *Json) Get(key string) *Json
 
     js.Get("top_level").Get("dict").Get("value").Int()
 
+func (j *Json) GetIndex(index int) *Json
+    GetIndex resturns a pointer to a new `Json` object for `index` in its
+    `array` representation
+
+    this is the analog to Get when accessing elements of a json array
+    instead of a json object:
+
+    js.Get("top_level").Get("array").GetIndex(1).Get("key").Int()
+
 func (j *Json) Int() (int, error)
     Int type asserts to `float64` then converts to `int`
 

simplejson.go

@@ -46,6 +46,22 @@ func (j *Json) Get(key string) *Json {
 	return &Json{nil}
 }
 
+// GetIndex resturns a pointer to a new `Json` object
+// for `index` in its `array` representation
+//
+// this is the analog to Get when accessing elements of
+// a json array instead of a json object:
+//    js.Get("top_level").Get("array").GetIndex(1).Get("key").Int()
+func (j *Json) GetIndex(index int) *Json {
+  a, err := j.Array()
+  if err == nil {
+    if len(a) > index {
+      return &Json{a[index]}
+    }
+  }
+  return &Json{nil}
+}
+
 // CheckGet returns a pointer to a new `Json` object and
 // a `bool` identifying success or failure
 //

simplejson_test.go

@@ -17,6 +17,8 @@ func TestSimplejson(t *testing.T) {
 	js, err := NewJson([]byte(`{ 
 		"test": { 
 			"array": [1, "2", 3],
+      "arraywithsubs": [{"subkeyone": 1},
+            {"subkeytwo": 2, "subkeythree": 3}],
 			"int": 10,
 			"float": 5.150,
 			"bignum": 9223372036854775807,
@@ -47,6 +49,16 @@ func TestSimplejson(t *testing.T) {
 		assert.Equal(t, i+1, iv)
 	}
 
+  aws := js.Get("test").Get("arraywithsubs")
+  assert.NotEqual(t, nil, aws)
+  var awsval int
+  awsval, _ = aws.GetIndex(0).Get("subkeyone").Int()
+  assert.Equal(t, 1, awsval)
+  awsval, _ = aws.GetIndex(1).Get("subkeytwo").Int()
+  assert.Equal(t, 2, awsval)
+  awsval, _ = aws.GetIndex(1).Get("subkeythree").Int()
+  assert.Equal(t, 3, awsval)
+
 	i, _ := js.Get("test").Get("int").Int()
 	assert.Equal(t, 10, i)