Is there a shorter way to do this?
See my earlier message. dissoc and assoc will do what you want.
(def brother {:name "Gary" :address "..." :mother "Mary" :father
"John"})
(def sister (assoc brother :name "Cindy"))
user=> sister
{:name "Cindy", :address "...", :mother "Mary", :father "John"}
While I'm on the subject, what is the difference between a structure
and a hash? Are there performance implications? Why wouldn't I just
use a hash if structs can hold new values anyway? When should I use
one over the other?
A struct-map is strictly a performance optimization, with one
additional constraint (that the required keys cannot be removed from
the struct: if you try, you'll get an error).
In every other respect it behaves just like any other map.
There are only two reasons to use struct-maps: if you've profiled and
need the tiny performance improvement (struct-maps store their
required keys in an internal array, which is sometimes faster); or if
you feel that struct-maps offer some documentation advantage for your
code.
struct-maps are not Clojure's equivalent of objects. Use maps unless
you have a clear reason to do otherwise.
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