Add `invoke` function

Question

When writing code that needs to do predicate dispatch (such as code analysis libraries), it's quite common to need an invoke function for a pattern that looks like:

`
(defn classify [x]
(condp invoke x

string? (string-f x ..)
number? (number-f x ..)
..))

`

This is definitely expressible without invoke, but the condp invoke pattern reads quite nicely.

Additionally invoke is also useful in the cases where one has a sliding window of functions and values, for patterns like:

(apply map invoke funs vals)

Patch: 0001-CLJ-2342-add-invoke.patch

Answer 1

Reference: https://clojure.atlassian.net/browse/CLJ-2342 (reported by bronsa)

Answer 2

Comment made by: rickmoynihan

Some use cases for this are also when you have partially applied all the arguments to a function already and want to call it.

{{(map (comp :result invoke) fns)}}

{{apply}} can't be used for these cases as it requires arguments to be provided.