Question 1

How to update nested JSON data with Partial Lenses?

Accepted Answer

Use `L.set` with a composed lens, such as `L.set(['titles', 0, 'text'], 'New Title', data)`, where array notation shorthand simplifies path specification. The library handles immutability by returning new objects.

Question 2

Partial Lenses vs Ramda lenses: which is better?

Accepted Answer

Partial Lenses offers more features like partiality and isomorphisms, focusing on JSON manipulation, while Ramda lenses are simpler and integrated with Ramda's functional utilities. Choose based on need for advanced optics versus a minimal, familiar API.

Question 3

Can Partial Lenses handle optional or missing properties?

Accepted Answer

Yes, it gracefully handles missing data by treating `undefined` as non-existent, with combinators like `L.optional` and `L.defaults` to provide fallbacks and maintain data invariants during updates.

Question 4

What are the performance benchmarks for Partial Lenses?

Accepted Answer

The README includes benchmarks showing minimal overhead compared to manual updates, making it efficient for complex operations, though very simple accesses might be slower due to abstraction layers.

Question 5

How to install Partial Lenses with npm?

Accepted Answer

Run `npm install partial.lenses` and import it as `import * as L from 'partial.lenses'`. It supports CommonJS and ES modules, with versions available on npm and Bower for broader compatibility.

Question 6

Does Partial Lenses work with TypeScript?

Accepted Answer

The library is written in JavaScript and lacks official TypeScript definitions, so TypeScript users may need community types or manual type annotations, which can limit type safety and integration.

partial.lenses

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