What's the easiest way to parse numbers in clojure?

Question

I\'ve been using java to parse numbers, e.g.

(. Integer parseInt  numberString)

Is there a more clojuriffic way that would handle both int

Answer 1

Use bigint and bigdec

(bigint "1")
(bigint "010") ; returns 10N as expected
(bigint "111111111111111111111111111111111111111111111111111")
(bigdec "11111.000000000000000000000000000000000000000000001")

Clojure's bigint will use primitives when possible, while avoiding regexps, the problem with octal literals or the limited size of the other numeric types, causing (Integer. "10000000000") to fail.

(This last thing happened to me and it was quite confusing: I wrapped it into a parse-int function, and afterwards just assumed that parse-int meant "parse a natural integer" not "parse a 32bit integer")