(update m k f)
(update m k f x)
(update m k f x y)
(update m k f x y z)
(update m k f x y z & more)
'Updates' a value in an associative structure, where k is a
key and f is a function that will take the old value
and any supplied args and return the new value, and returns a new
structure. If the key does not exist, nil is passed as the old value.
Source
(defn update
"'Updates' a value in an associative structure, where k is a
key and f is a function that will take the old value
and any supplied args and return the new value, and returns a new
structure. If the key does not exist, nil is passed as the old value."
{:added "1.7"
:static true}
([m k f]
(assoc m k (f (get m k))))
([m k f x]
(assoc m k (f (get m k) x)))
([m k f x y]
(assoc m k (f (get m k) x y)))
([m k f x y z]
(assoc m k (f (get m k) x y z)))
([m k f x y z & more]
(assoc m k (apply f (get m k) x y z more))))