# playground `playground` is a tool to help you running your Rust code file without manually setting up a Cargo project. ## Install ``` cargo install playground ``` ## Usage Simply running `playground ` is sufficient. You can specify your external dependency at the beginning of your file with the prefix `//#`. It accepts the same TOML syntax as in `Cargo.toml`. ## Example ```rust $ cat serde_json.rs //# serde_json = "*" use serde_json::{Result, Value}; fn main() -> Result<()> { // Some JSON input data as a &str. Maybe this comes from the user. let data = r#" { "name": "John Doe", "age": 43, "phones": [ "+44 1234567", "+44 2345678" ] }"#; // Parse the string of data into serde_json::Value. let v: Value = serde_json::from_str(data)?; // Access parts of the data by indexing with square brackets. println!("Please call {} at the number {}", v["name"], v["phones"][0]); Ok(()) } $ playground serde_json.rs Please call "John Doe" at the number "+44 1234567" ```