Benefit over recursiveUpdate?

[jorsn]

What's the benefit of this over recursiveUpdate?

[masaeedu]

Well for one thing you can use it to overwrite a deeply nested attrset as well as non-attrsets. The former is not supported by recursiveUpdate.

That aside, they're profunctor optics: so you can do all the stuff with them that you can with profunctor optics. You can:

• pass them around
• compose them
• use them to read deeply nested fields
• use them to write deeply nested fields (this is the only feature recursiveUpdate supports afaict)
• use them to modify deeply nested fields (with access to the original value)
• instantiate them at any suitable profunctor (the previous three bullet points are examples)