Farzad Yousefzadeh
Lead developer @epicgames. Core @statelyai. Coach @mentorcruise. ❤️ Statecharts, Finite State Machines, and XState.
Visual programming and executable models
Farzad Yousefzadeh
Farzad Yousefzadeh
Lead Engineer @Stately
Feature programming
Feature programming
Feature programming improved v1
Other improvements
Enter Diagrams
Benefits of diagrams
👉🏻 See entire system
👉🏻 Edge cases
👉🏻 Zooming
👉🏻 Plan and estimate
👉🏻 Integrations
👉🏻 See layers
Diagram types
👉🏻 Hierarchy (spawning)
👉🏻 Sequences
👉🏻 Multi actor (event drive)
purchase only items exist in cart
a part of logic that needs to be checked only if a parent condition is met
Continuous integration
Multi step consent form
separate modules or functions
cloud functions, web workers, k8s pods
Actors
Diagrams show you how the software you're building is a collection of actors structured in a certain way
If diagrams are so good, why not just diagram the software instead of programming it?
Stately.ai
Your entire software can be a collection of graphs
Stately.ai
Finite state machines
Statecharts
state ==> state
(state+ event) ==> next state + side effects
How is Stately different
👉🏻 Diagrams are the source of truth
👉🏻 Diagram ➡ model ➡ execute
👉🏻 Export to more than just code
👉🏻 Import from more than just code
👉🏻 Multi-purpose
👉🏻 Across the stack
Diagrams to the next level
👉🏻 Generate event sequences
👉🏻 Collaborative
👉🏻 Smart reshaping by analytics
Recap
👉🏻 Diagrams improve modeling
👉🏻 Diagrams are low code and abstract
👉🏻 Diagrams can be the single source of truth
👉🏻 Diagrams are not enough
👉🏻 Start diagramming for new features
👉🏻 Start diagramming when refactoring
Kiitos.
Visual programming and executable models
By Farzad Yousefzadeh
Visual programming and executable models
Let's look at the traditional way of making software, the importance of diagramming and ideas to take diagrams to the next level where they can be used as the single source of truth for the software behavior generating rest of the software such as tests, documentation and the runtime.
