lesson-plan.md

• Intro slide
• Hello, World Example
  • Explain:
    • fn declaration
    • println is a macro
  • Format strings in println!
    • println("Hello, {}!", world);
    • also show {:?}
  • Move "world" into a local variable so we can change it
    • let name = "Rustacean"; println("Hello, {}!", name);
  • Abstract into a helper fn
    • fn greet(name: String) { println("Hello, {}!", name); }
    • What goes wrong?
      • Explain format!, show how you can use same helpers
      • Explain push_str and mutable local variables
        • let mut name = format!("fellow "); name.push_str("Rustacean");
  • Call helper fn twice
    • What goes wrong now?
• Ownership slides
• Borrowing slides
• Borrowing example
  • Show that & and &mut cannot overlap
  • Time-limited
• For loops
  • show that s has type String
• Options and enums
  • explain about unwrap and how it is risky
  • show let x = None and unwrap
  • modify to some other example, like Shape / Square / Circle
• Sequential search
  • 10 minutes, wonder about
• Parallel search
  • note the use statement
  • let's look at these two curious clones:
    • we'll start with shopping_list
      • type of shopping_list is in fact a reference
      • threads can't close over a reference
        • try to remove the clone, see what happens
    • what about name?
      • name is needed because store is moved into
  • how do we parallelize?
    • we have to start ALL the threads before we join ANY of them
• Shared memory exercise
  • Afterwards:
    • show how you can change so that we request an Vec<ShoppingList> instead of &Vec, note that in general if you will consume data, it's best to take it by value, and let the owner clone if they must
    • note that this applies equally well when using channels, and in fact a common pattern is to send an Arc<T> over a channel