Absolute value of a number in Clojure

Question

How can the absolute number of a value be calculated in Clojure?

(abs  1) => 1 (abs -1) => 1 (abs  0) => 0 

Answer 1

For double, float, long and int you can use the java.lang.Math method abs (Math/abs -1)

Take care it won't work for decimals, ratio's, bigint(eger)s and other Clojure numeric types. The official clojure contrib math library that tries guarantee working correctly with all of these is clojure.math.numeric-tower