How do I implement foreach loop in clojure?

Question

Implementing a for loop in clojure seems to be easy, but how can I implement a foreach statement that reads each element in the list(vector) and does something?

like this...

(foreach i list expression)

Thanks in advance!

What about [`map`](http://clojure.github.com/clojure/clojure.core-api.html#clojure.core/map): `(map (fn [i] …) list)`? — Gumbo, Mar 12 '11 at 22:13

score 32 · Accepted Answer · answered Mar 12 '11 at 22:25

32

Just replace for with doseq and you're all set. Don't use map, which is just as lazy as for.

answered Mar 12 '11 at 22:25

amalloy

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17

More precisely: (doseq [i list] expression) – Alex Miller Mar 12 '11 at 22:30
Thanks, Alex. I figured my answer was sufficient since he already knows how to use `for`, but of course people may wind up reading this who don't. – amalloy Mar 13 '11 at 04:14

score 0 · Answer 2 · answered Feb 26 '14 at 11:29

map is the functional equivalent of foreach, whereas doseq is for imperative programming with side-effects.

map takes a function f and a seqable collection coll and returns the lazily-evaluated result of applying f to each element in the collection.

Example:

(map inc [1 2 3 4])
=> (2 3 4 5)

(map (fn [x] (* x 2)) [1 2 3 4])
=> (2 4 6 8)

(map dec (take 5 (range)))
=> (-1 0 1 2 3)

How do I implement foreach loop in clojure?

2 Answers2

Example:

Linked