Microsoft To-Do

React Practices

Microsoft To-Do

React

Redux

Redux-actions

ES6 + TypeScript

eslint plugins

ImmutableJS

...

Just a To-Do list...

Reselect

Passing state

vs.

ICC

ICC

=

Independently

Connected

Components

State Passing

Model Passing

Primitives Passing

props.completed
props.todo.completed

Model Passing

  1. Data hierarchy == View hierarchy
  2. Expensive updates
  3. Very sensitive to changes
  4. Where do I add child data?
  5. Derived data dependencies

Easy vs. Performant

Primitives Passing

  1. Data hierarchy == View hierarchy
  2. Expensive updates
  3. Sensitive to changes
  4. Where do I add child data?
  5. Derived data dependencies
  6. Does not extend (too many things)

Performant vs. Extensible

ICC

  1. Data hierarchy == View hierarchy
  2. Expensive updates
  3. Sensitive to changes
  4. Where do I add child data?
  5. Derived data dependencies
  6. Does not extend (too many things)
  7. Performance?
  8. SCARY!!!

Extensible vs. ?

Let's split!

Data vs View

Connector + Component = single entity

ICC Data Hierarchy

Not so scary...

ICC View Hierarchy

Not so scary...

What about Performance?

Worry not!

State passing

ICC

Now FIGHT!!!

Rendering: 1717 ms

Total: 1680 ms

ICC + react-redux < v5.0.0

Rendering: 600 ms

Total: 1660 ms

No Batcher + react-redux < v5.0.0

Rendering: 500 ms

Total: 1720 ms

No Batcher + react-redux v5.0.0beta3

  1. More components = less overhead
    25 items -> ~50ms, 500 items -> ~300ms

  2. Every connect() adds 0.1ms to initial rendering time

  3. State Passing is  <10% faster in our hot rendering path 🔥but ...

  4. Single file with ~50 selectors and 25 handlers 🙀

Complexity

vs.

a bit of Performance

  1. Measure in your own case 🔎
  2. Use virtualized list 📜
  3. Do not create custom Batchers 💩

Composing behaviour using React components may not be the best idea...

...but that's a different story!

Thank you!

Questions?

Microsoft To-Do

By Alexey Migutsky

Microsoft To-Do

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