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!
2 Answers
Just replace for with doseq and you're all set. Don't use map, which is just as lazy as for.
2 Comments
Alex Miller
More precisely: (doseq [i list] expression)
amalloy
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.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)
map:(map (fn [i] …) list)?