Merge pull request #1 from JuanMaRuiz/feature/add-generator

Add isbn generator

__test__/generator.test.js

@@ -0,0 +1,7 @@
+const generator = require('./../src/generator.js');
+const validator = require('./../src/validator.js');
+
+test('should return a valid isbn according with the passed param', () => {
+  const validIsbn = generator('10');
+  expect(validator(validIsbn)).toBe(true);
+});

src/generator.js

@@ -0,0 +1,18 @@
+const validator = require('./validator');
+const isbnTypes = {
+  10: '10',
+  13: '13'
+};
+
+const generator = (type = isbnTypes[10]) => {
+  const randomNumber = parseInt(Math.random() * parseInt(Math.pow(10,type)));
+  if ( type === isbnTypes[type] ) {
+    const tempIsbn = randomNumber.toString();
+    return validator(tempIsbn) ? tempIsbn : generator(type);
+  } else {
+    console.error('Invalid option. Pass "10" for isbn-10 and "13" for isbn-13');
+    process.exit(1);
+  }
+};
+
+module.exports = generator;