Make ToIntSliceE more flexible

Now it accepts any slice or array type that contains a type supported by ToIntE.

[close #12]

cast_test.go

@@ -82,6 +82,8 @@ func TestSlices(t *testing.T) {
 	assert.Equal(t, []string{"1", "3"}, ToStringSlice([]interface{}{1, 3}))
 	assert.Equal(t, []int{1, 3}, ToIntSlice([]int{1, 3}))
 	assert.Equal(t, []int{1, 3}, ToIntSlice([]interface{}{1.2, 3.2}))
+	assert.Equal(t, []int{2, 3}, ToIntSlice([]string{"2", "3"}))
+	assert.Equal(t, []int{2, 3}, ToIntSlice([2]string{"2", "3"}))
 }
 
 func TestToBool(t *testing.T) {

caste.go

@@ -321,21 +321,33 @@ func ToStringSliceE(i interface{}) ([]string, error) {
 func ToIntSliceE(i interface{}) ([]int, error) {
 	jww.DEBUG.Println("ToIntSliceE called on type:", reflect.TypeOf(i))
 
-	var a []int
+	if i == nil {
+		return []int{}, fmt.Errorf("Unable to Cast %#v to []int", i)
+	}
 
 	switch v := i.(type) {
-	case []interface{}:
-		for _, u := range v {
-			a = append(a, ToInt(u))
-		}
-		return a, nil
 	case []int:
 		return v, nil
+	}
+
+	kind := reflect.TypeOf(i).Kind()
+	switch kind {
+	case reflect.Slice, reflect.Array:
+		s := reflect.ValueOf(i)
+		a := make([]int, s.Len())
+		for j := 0; j < s.Len(); j++ {
+			val, err := ToIntE(s.Index(j).Interface())
+			if err != nil {
+				return []int{}, fmt.Errorf("Unable to Cast %#v to []int", i)
+			}
+			a[j] = val
+		}
+		return a, nil
 	default:
-		return a, fmt.Errorf("Unable to Cast %#v to []int", i)
+		return []int{}, fmt.Errorf("Unable to Cast %#v to []int", i)
 	}
 
-	return a, fmt.Errorf("Unable to Cast %#v to []int", i)
+	return []int{}, fmt.Errorf("Unable to Cast %#v to []int", i)
 }
 
 func StringToDate(s string) (time.Time, error) {