moved out memds

Author: jbenet

README.md

@@ -10,10 +10,12 @@ Note: this is similar to [rvagg/abstract-leveldown](https://github.com/rvagg/abs
 
 ## Example
 
-See [try.js](try.js)
+### Usage
+
+See [datastore.memory/try.js](https://github.com/jbenet/datastore.memory/blob/master/try.js):
 
 ```js
-var memDS = require('datastore.abstract/memds')
+var memDS = require('datastore.memory')
 ds.put('foo', 'bar', function(err, val, key) {
   if (err) throw err
   console.log('put ' + key + ': ' + val)
@@ -44,6 +46,47 @@ ds.has('foo', function(err, has, key) {
 })
 ```
 
+### Implementation
+
+See [datastore.memory/index.js](https://github.com/jbenet/datastore.memory/blob/master/index.js):
+
+```js
+var DS = require('datastore.abstract')
+
+module.exports = MemDS
+
+function MemDS() {
+  if (!(this instanceof MemDS))
+    return new MemDS
+  DS.call(this)
+  this.values = {}
+}
+
+DS.inherits(MemDS)
+
+MemDS.prototype._get = function(key, cb) {
+  var val = this.values[key.toString()]
+  if (val !== undefined) cb(null, val, key)
+  else cb(MemDS.errors.NotFound, null, key)
+}
+
+MemDS.prototype._put = function(key, val, cb) {
+  this.values[key.toString()] = val
+  cb(null, val, key)
+}
+
+MemDS.prototype._delete = function(key, cb) {
+  delete this.values[key.toString()]
+  cb(null, key)
+}
+
+MemDS.prototype._has = function(key, cb) {
+  var has = (this.values[key.toString()] !== undefined)
+  cb(null, has, key)
+}
+```
+
+
 ## License
 
 MIT