CODEWITHSUNDEEP
clojure
Brad Koch
Brad Koch

Reputation: 20297

Simple way to truncate a string in Clojure

I have a string that must be truncated at 200 characters if it is too long.

Checking the cheatsheet, (subs "Lorem Ipsum" 0 200) would seem to be an obvious choice, but it throws an exception if the second operator is greater than the length of the string.

Is there a simple, built-in function for truncating a string in Clojure? What's the simplest way to do this if I have to define my own?

Upvotes: 20

Views: 5026

Answers (2)

ponzao
ponzao

Reputation: 20934

You can treat them as sequences and get safety (and elegance?) but the cost is performance:

(defn truncate
  [s n]
  (apply str (take n s)))

Upvotes: 8

xsc
xsc

Reputation: 6073

You can check the length beforehand or use min to determine the actual number of characters that will remain:

(defn trunc
  [s n]
  (subs s 0 (min (count s) n)))

Upvotes: 29

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