Resources tutorial

[Michael-F-Bryan]

Intro

• A promise statement
  • We're going to introduce the concept of "resources"
  • Gives the host access to an "object" with associated behaviour without exposing how that object is implemented, or even which language it was written in
• A preview of what's to come
  • We'll turn our calculator into an object

Body

Define the WIT file:

// calculator-v2.wit
resource calculator {
    static new: func(initial-value: f32) -> calculator
    current-value: func() -> f32
    add: func(value: f32)
    multiply: func(value: f32)
    divide: func(value: f32)
}

Implement the guest:

• Explain the need for interior mutability
• Publish

Use the bindings:

• Create a Python project
  • Use pytest to test the calculator is correct
• Create a JavaScript project
  • Similar tests, but with Jest

Conclusion

• Reminder of how helpful the guide is
• Reiterate how important your topic is
• Call-to-action
  • Create a Regex library using the regex crate