CODEWITHSUNDEEP
clojure
user2219372
user2219372

Reputation: 2455

is there something in clojure like * or ** in python?

I have a vector and want to call a function in Clojure. The function accepts many arguments and I have vector.

For example:

 (defn f [a b] (+ a b))

and I have the vector:

  [1 2]

I can use apply:

  (apply f [1 2])

But can I call f in Clojure like in python?

  (f *[1 2]) .

My use case is that I need to dissoc some keys from a map. I want to call (dissoc amap *keys), but it's not supported.

I could use apply 

(apply dissoc (cons amap keys))

but it's not so convenient.

What's the best way to do this in Clojure?

Upvotes: 1

Views: 289

Answers (1)

Thumbnail
Thumbnail

Reputation: 13473

As everyone else noticed, apply is the exact equivalent of Python's arbitrary argument lists. In your use-case, given 

(def a-map {1 2, 3 4, 5 6})
(def some-keys (range 5))

to dissoc some-keys from a-map 

(apply dissoc a-map some-keys)
; {5 6}

My original solution also works

(reduce dissoc a-map some-keys)
; {5 6}

but only because dissoc can take its key arguments one at a time or all at once.

Upvotes: 6

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