Question 1

How does DerivableJS compare to MobX?

Accepted Answer

DerivableJS is more minimal with a smaller API, requires explicit .get/.set calls, lacks built-in collections, but is faster and has a declarative effects system. The README details these key differences in a dedicated section.

Question 2

How to use DerivableJS with React?

Accepted Answer

Integrate via the react-derivable project, which allows seamless use of derivables in render methods and interop with component state and props, as mentioned in the 'With React' section of the README.

Question 3

Can DerivableJS handle immutable data collections?

Accepted Answer

Yes, but it requires external libraries like Immutable.js since DerivableJS has no built-in observable collections. The README notes it works 'spiffingly' with Immutable for medium-to-large collections.

Question 4

What are reactors and how do they work?

Accepted Answer

Reactors are independent agents that execute side effects when derivables change, with declarative control over when they start and stop. They simplify effect management, as shown in the example app in the README.

Question 5

Is DerivableJS production ready?

Accepted Answer

The README states it's considered a solid beta-quality piece of kit and has been used in production, making it mature enough for real-world use, though it might have fewer updates than mainstream libraries.

Question 6

How does transaction batching work?

Accepted Answer

Use the transact function to batch multiple state updates, avoiding intermediate reactions and improving performance. The greeting app example demonstrates this to prevent unwanted console logs.

DerivableJS

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