Merge branch 'creditCard' of https://github.com/zpiman/faker.js

1 files changed, 18 insertions, 0 deletions

diff --git a/test/support/luhnCheck.js b/test/support/luhnCheck.js
new file mode 100644
index 00000000..1e195544
--- /dev/null
+++ b/test/support/luhnCheck.js
@@ -0,0 +1,18 @@
+module.exports = function (number) {
+  number = number.replace(/\D/g,"");
+  var split = number.split("");
+  split = split.map(function(num){return parseInt(num);});
+  var check = split.pop();
+  split.reverse();
+  split = split.map(function(num, index){
+    if(index%2 === 0) {
+      num *= 2;
+      if(num>9) {
+        num -= 9;
+      }
+    }
+    return num;
+  });
+  var sum = split.reduce(function(prev,curr){return prev + curr;});
+  return (sum%10 === check);
+};