The Book

Following along The Book to document my thoughts and progress while learning Rust. I am coming from a javascript, typescript background, The sample applications we build along the way are located in the ./apps directory:

• guessing game
• tempurature converter
• fibonacci sequencer
• christmas carol lyrics

Ownership

Rust manages memory efficiently through ownership. To types of memory are stack & heap. Stacks are FIFO system such as a stack of plates. length and type must be static. This is why I cannot push data onto an array like we do so often in typescript. Tuples utilize heap based memory which require a pointer to access.

Debug ownership

Byte logic to determine the index of new words look different than what I've seen in typescript. Let's debug it.

Using VSCode, install Rust & CodeLLDB extensions then create a launch.json. Put a breakpoint anywhere and F5 it.

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "ownership",
            "type": "lldb",
            "request": "launch",
            "program": "${workspaceRoot}/ownership/target/debug/ownership",
            "args": [],
            "cwd": "${workspaceRoot}",
        }
    ]
}

Error Handling

• unwrap and expect methods are very handy when prototyping, before you’re ready to decide how to handle errors. They leave clear markers in your code for when you’re ready to make your program more robust.

• It’s advisable to have your code panic when it’s possible that your code could end up in a bad state.

Useful commnads

• RUST_BACKTRACE=1 cargo run
• `cargo new