This is peripheral to the real focus of this thread, but it's worth noting
the parallel between objects and closures. You can implement encapsulation
with closures--although it's less useful if without mutability. Scheme was
supposedly designed as a language for exploration of object-oriented
Will just add, in re: an earlier thread on this talk, one way to view this
is in re: the lifespan of the data.
Building and evolving the components that deal with live data passed around
between them is easier and more fluid when working with maps than with
working with types. One can add a field
I'm curious for the response re: #3 as well, but one pain point I've
experienced with protocols vs multimethods is that as a system evolves,
retaining the semantics that led me to bundle functions together into a
protocol in the first place has sometimes been difficult, a source of
incidental compl
If you implement an API returning custom types or records, consumers
will have to adhere to the same implementation in their own implementations,
The so called freedom becomes a cage for others, they are stuck
with your implementation and it leaks out in places were they should not.
Using generic
can you elaborate on #3? What constraints did you run into with
type-based dispatch that a multimethod that dispatched on :op allowed
you to get around? It seems like, if that's your pattern, lifting the
:op field up into an actual record type would only give you MORE
freedom. You rely on the c
A couple of things on this subject:
1) protocols were invented primarily for their speed. If one was going to
write Clojure in Clojure it would be a little hard to implement
PersistentHashMaps using pure data. You have to start with something. Thus
deftype and defprotocol were born.
2) Unlike in
On 19 January 2014 19:55, Brian Craft wrote:
> http://www.youtube.com/watch?v=ROor6_NGIWU
>
> Around 56:28 Rich is talking about whether components pass a data
> structure, or "an object that has all these verbs and knows how to do stuff
> ...".
>
> Clojure data types also have verbs, in protocol
