Brownbag notes

Brownbag notes

- `git checkout explicit-types`
- show more type errors possible w/ annotations

- `git checkout hello-world`
- show undefined error, type error (in editor, in browser)
- `elm-repl`
- Built-in Types
- `git checkout explicit-types`
- show more type errors possible w/ annotations

- Lists
  - talk a little about type parameters / parametericity here
- Tuples
- Records
- Type Inference
- Functions
- Modules
- Types
  - more about parametricity here

- Standard Lib
  - Maybe
    - map
    - andThen  
  - Result
    - map
    - andThen    
  - No Runtime Exceptions
    - compiler prevents type errors
    - nil errors
    - unhandled cases

Pattern Matching and Destructuring

- Building Web Apps - The Elm Architecture
  - `git checkout simple-counter`
  - show compiler catching unhandled Msg type
  - `git checkout more-counter`

- Embedding your app in HTML

- managed effects
 - side-effects
 - purity
 - Debug.log
 - Tasks
 - Subscriptions
 - Ports

- Tasks, Cmds and HTTP  
  - relation to callbacks
  - `git checkout json`
  - startup json-server
  - Can fail, but compiler makes you handle it...

- Handling JSON

Dealing with External Events - Subscriptions
- Ports 
 - your elm and js can subscribe to messages from each other
   - how does elm handle messages? through update
     - so you need to describe how to turn message from JS into an Elm message
   - how does js handle messages? with callbacks
     - so you need to fire off an async task from Elm to JS  

• git checkout explicit-types
• show more type errors possible w/ annotations
• git checkout hello-world
• show undefined error, type error (in editor, in browser)
• elm-repl
• Built-in Types
• git checkout explicit-types
• show more type errors possible w/ annotations
• Lists
  • talk a little about type parameters / parametericity here
• Tuples
• Records
• Type Inference
• Functions
• Modules
• Types
  • more about parametricity here
• Standard Lib
  • Maybe
    • map
    • andThen
  • Result
    • map
    • andThen
  • No Runtime Exceptions
    • compiler prevents type errors
    • nil errors
    • unhandled cases

Pattern Matching and Destructuring

• Building Web Apps - The Elm Architecture
  • git checkout simple-counter
  • show compiler catching unhandled Msg type
  • git checkout more-counter
• Embedding your app in HTML
• managed effects
  • side-effects
  • purity
  • Debug.log
  • Tasks
  • Subscriptions
  • Ports
• Tasks, Cmds and HTTP
  • relation to callbacks
  • git checkout json
  • startup json-server
  • Can fail, but compiler makes you handle it...
• Handling JSON

Dealing with External Events - Subscriptions

• Ports
  • your elm and js can subscribe to messages from each other
    • how does elm handle messages? through update
      • so you need to describe how to turn message from JS into an Elm message
  • how does js handle messages? with callbacks
    • so you need to fire off an async task from Elm to JS