Usage of serde_json

Some sample code shows behavior of serde_json.

I used to write code like

val.as_object().unwrap().get("field_name").unwrap().as_object().unwrap().get_("sub_field_name").as_str().unwrap().

Turns out that using index of serde_json makes code much less verbose.

	use serde_json::Value;
	fn main() {
	let test_json = r#"
	{
	"a":"a_val",
	"b":{
	"b_sub" : "b_sub_val"
	},
	"d":[
	{
	"d0" : "d0_val"
	},
	{
	"d1" : "d1_val"
	}
	]
	}
	"#;
	let val: Value = serde_json::from_str(test_json).unwrap();
	println!("{}", val["a"]);
	println!("{}", val["b"]);
	println!("{}", val["b"]["b_sub"]);
	println!("{}", val["b"]["b_sub"].to_string());
	println!("{}", val["b"]["b_sub"].as_str().unwrap());
	println!("{}", val["d"][0]["d0"].as_str().unwrap());
	println!("{}", val["no_exist"]["what_will_happen"]);
	}

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