How to use the demo

Preparations

• Clone the project
• Install node JS from here https://nodejs.org/fr
• After installing node js, go to the folder Your_Relative_path\RustForTheWeb\rust_vs_js\demo_js and do npm install
• Install rust and cargo from here https://rust-lang.org/tools/install/

Usage

Javascript Demo

• Run node bug.js in the demo_js folder and access the server via http://localhost:3000
• add user/1 to test to retrieve one user and then try user/3. You should see an error from the server

Rust Demo

• go to the folder Your_Relative_path\RustForTheWeb\rust_vs_js\demo-rust
• Comment one of the two get_user methods and do cargo run

One of the method will do a compile error, the other one will run the server and handle the error

What does it demonstrate ?

It shows us that when using for example Javascript, you could theoretically put a server on in production and still have an error if you didn't thought about the user trying to retrieve an inexistent ID. This will return a 500 error from the server

In Rust, if you don't take into account the fact that null could be a possibility, Rust won't let you even compile the server and forces you to take taht into account and handle this potential error.