Added Set#random()

lib/objects/set.js

@@ -64,6 +64,19 @@ Set.prototype.pop = function(fn){
   return this;
 };
 
+/**
+ * Return a random element from this set and callback `fn(err, str)`.
+ *
+ * @param {Function} fn
+ * @return {Set} for chaining
+ * @api public
+ */
+
+Set.prototype.random = function(fn){
+  this.client.srandmember(this.key, fn);
+  return this;
+};
+
 /**
  * Get the members in this set and callback`fn(err, members)`.
  *

test/set.test.js

@@ -48,5 +48,20 @@ module.exports = {
         done();
       });
     });
+  },
+
+  '.random()': function(done){
+    var names = new Set('names');
+    names.add('tj');
+    names.add('aaron');
+    names.add('guillermo');
+    names.random(function(err, name){
+      name.should.be.a('string');
+      names.card(function(err, cardinality){
+        cardinality.should.equal(3);
+        names.client.end();
+        done();
+      });
+    });
   }
 };