Merge pull request #243 from Aweary/random-seed

[api] Implement faker.seed for deterministic output

1 files changed, 11 insertions, 3 deletions

diff --git a/lib/random.js b/lib/random.js
index 2d37c551..fc7e54d9 100644
--- a/lib/random.js
+++ b/lib/random.js
@@ -1,7 +1,15 @@
 var mersenne = require('../vendor/mersenne');
 
-function Random (faker) {
-  
+function Random (faker, seed) {
+  // Use a user provided seed if it exists
+  if (seed) {
+    if (Array.isArray(seed) && seed.length) {
+      mersenne.seed_array(seed);
+    }
+    else {
+      mersenne.seed(seed);
+    }
+  }
   // returns a single random number based on a max number or range
   this.number = function (options) {
 
@@ -28,7 +36,7 @@ function Random (faker) {
     var max = options.max;
     if (max >= 0) {
       max += options.precision;
-    } 
+    }
 
     var randomNumber = options.precision * Math.floor(
       mersenne.rand(max / options.precision, options.min / options.precision));