crodjer · May 22, 2013 06:39 · May 22, 2013
diff --git a/uuids.js b/uuids.js
@@ -0,0 +1,57 @@
+function uuids (count, seed) {
+  var pattern = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx';
+  var _uuids = [];
+
+
+  if (count === undefined) {
+    count = 1;
+  }
+
+  if (seed === undefined) {
+    seed = 1;
+  }
+
+  if (count < 1 && count > 0) {
+    seed = count;
+    count = 1;
+  }
+
+  if (count <= 0) {
+    throw 'Count should be greater than 0';
+  }
+
+  if (seed <= 0 || seed > 1) {
+    throw 'Seed should be in greater than 0 and less than or equal to 1';
+  }
+
+  function getUUID(pattern) {
+    // Borrowed from http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript/2117523#2117523
+    return pattern.replace(/[xy]/g, function(character) {
+      var seeded_rand;
+
+      var raw_rand = Math.random();
+      var max = Math.max(raw_rand, seed);
+      var min = Math.min(raw_rand, seed);
+
+      if (max === 0) {
+        seeded_rand = 0;
+      } else {
+        /* This is required to ensure that either of the numbers don't decrease
+           the range of set size. That is why seed * raw_rand will not be right. */
+        seeded_rand = min/max;
+      }
+
+      var ranged_rand = seeded_rand*16|0;
+      var replacement = character === 'x' ? ranged_rand : (ranged_rand & 0x3|0x8);
+
+      return replacement.toString(16);
+    });
+  }
+
+
+  // Fill up uuids upto the count which is asked for
+  while(_uuids.push(getUUID(pattern)) < count) {
+  }
+
+  return _uuids;
+};