[update] Version to 3.3.0

Author: nhunzaker

CHANGELOG.md

@@ -1,5 +1,14 @@
 # Changelog
 
+### 3.3.0
+
+- `mapBy` internal function now accepts an initial value
+- Changed `Microcosm::dispatch` copy strategy. Instead of merging a
+  change set, it now directly modifies a clone of the previous
+  state.
+- Added `Microcosm::clone`. This method defines how state is copied
+  before dispatching an action.
+
 ### 3.2.0
 
 - Changed default shouldUpdate algorithm

dist/Microcosm.js

@@ -1,6 +1,6 @@
 {
   "name": "microcosm",
-  "version": "3.2.0",
+  "version": "3.3.0",
   "description": "A functional flux architecture",
   "main": "dist/Microcosm.js",
   "scripts": {

dist/Microcosm.js.map

@@ -80,15 +80,23 @@ export default class Microcosm {
     return this.dispatch(fn, request)
   }
 
+  clone() {
+    return Object.create(this._state)
+  }
+
   dispatch(action, body) {
+    let clone = this.clone()
+
     // First get all stores that can repond to this action
     const answerable = this._stores.filter(store => action in store)
 
     // Next build the change set
-    const changes = mapBy(answerable, store => store[action](this.get(store), body))
+    let next = mapBy(answerable,
+                     store => store[action](clone[store], body),
+                     clone)
 
     // Produce the next state by merging changes into the current state
-    this.swap(changes)
+    this.reset(next)
 
     // Send back the body to the original signaler
     return body

package.json

@@ -3,9 +3,9 @@
  * Take a list and reduce it into an object
  */
 
-export default function mapBy (array, fn) {
+export default function mapBy (array, fn, initial={}) {
   return array.reduce(function(memo, next) {
     memo[next] = fn(next)
     return memo
-  }, {})
+  }, initial)
 }