Add exponential formatting

index.js

@@ -6,6 +6,9 @@ export default function format(v, type='', str=''){
         return basicFormat(v);
     }
 
+    if(type === 'Number' && str.toLowerCase() === 'e'){
+        return v.toExponential();
+    }
 
     if(type === 'DateTime'){
         if(!(v instanceof Date)){

package.json

 {
   "name": "ed3-format-default",
-  "version": "0.1.0",
+  "version": "0.2.1",
   "description": "Default format for ed3 library",
   "main": "index.js",
   "scripts": {

test/test_format.js

@@ -47,4 +47,9 @@ describe('format', ()=>{
 
         expect(format(1000*60*60*24, 'DateTime', 'yyyy-mm-dd')).to.be('1970-01-02');
     });
+
+    it('should do exponential formatting', ()=>{
+        expect(format(0, 'Number', 'e')).to.be('0e+0');
+        expect(format(0, 'Number', 'E')).to.be('0e+0');
+    });
 });