Merge pull request rust-num#227 from killercup/docs/pointer-example

Add a short example to Value::pointer

json/src/value.rs

@@ -352,6 +352,21 @@ impl Value {
     /// returned.
     ///
     /// For more information read [RFC6901](https://tools.ietf.org/html/rfc6901).
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # #[macro_use] extern crate serde_json;
+    /// use serde_json::{Value, from_str};
+    ///
+    /// # pub fn try_main() -> Result<(), serde_json::Error> {
+    /// let data: Value = from_str(r#"{"x": {"y": ["z", "zz"]}}"#)?;
+    ///
+    /// assert_eq!(data.pointer("/x/y/1").unwrap(), &json!("zz"));
+    /// assert_eq!(data.pointer("/a/b/c"), None);
+    /// # Ok(()) }
+    /// # fn main() { try_main().unwrap() }
+    /// ```
     pub fn pointer<'a>(&'a self, pointer: &str) -> Option<&'a Value> {
         if pointer == "" {
             return Some(self);