Merge pull request #2 from rspective/generate-many

generate many unique codes

README.md

@@ -1,6 +1,6 @@
 ## Voucher Code Generator
 
-Generate unique, hard to guess coupon codes.
+Generate unique, hard to guess coupon, voucher codes.
 
 This library originates from [Voucherify](http://www.voucherify.io/?utm_source=inbound&utm_medium=github&utm_campaign=js-voucher-code-generator-beta).
 
@@ -17,11 +17,27 @@ Include with require:
 var voucher_codes = require('voucher-code-generator');
 ```
 
-Generate codes of requested length:
+Generate 5 codes, each 8 characters long:
 ```
 voucher_codes.generate({
-    length: 8
+    length: 8,
+    count: 5
 });
 ```
 
-Sample result: `B5xdYJn1`
+Sample result: `['FR6bwx1q', 'ByamOdWV', '7roFwfQs', 'rmWlwvll', 'pgih5eAB']`
+
+
+### Testing
+
+Install dependencies:
+
+```
+npm install
+```
+
+Run tests:
+
+```
+npm run test
+```

package.json

@@ -1,6 +1,6 @@
 {
     "name": "voucher-code-generator",
-    "version": "0.0.1",
+    "version": "0.0.2",
 
     "homepage": "http://www.voucherify.io/",
     "description": "Voucher Code Generator",

test/voucher_codes.spec.js

@@ -4,16 +4,29 @@ describe('voucher_codes', function(){
 
     it('should generate code of request length', function(){
         var length = 5;
-        var code = voucher_codes.generate({length: length});
+        var code = voucher_codes.generate({length: length})[0];
 
         expect(code.length).toBe(length);
     });
 
     it('should generate code of default length', function(){
         var default_length = 8;
-        var code = voucher_codes.generate({});
+        var code = voucher_codes.generate({})[0];
 
         expect(code.length).toBe(default_length);
+    });
+
+    it('should generate 5 unique codes', function(){
+        var codes = voucher_codes.generate({
+            length: 2,
+            count: 5
+        });
+
+        expect(codes.length).toBe(5);
+        codes.forEach(function(code) {
+            expect(code.length).toBe(2);
+            expect(codes.indexOf(code)).toBe(codes.lastIndexOf(code)); // check uniqueness
+        })
     })
 
 });

voucher_codes.js

@@ -8,7 +8,7 @@ function randomElem(arr) {
     return arr[randomInt(0, arr.length-1)];
 }
 
-function generate(config) {
+function generateOne(config) {
     var length = config.length || 8;
     var charset = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
     var code = "";
@@ -18,6 +18,19 @@ function generate(config) {
     return code;
 }
 
+function generate(config) {
+    var count = config.count || 1;
+    var codes = {};
+    while (count > 0) {
+        var code =  generateOne(config);
+        if (codes[code] === undefined) {
+            codes[code] = true;
+            count--;
+        }
+    }
+    return Object.keys(codes);
+}
+
 module.exports = {
     generate: generate
 };