higher order store functions

src/core/data/store/Store.js

@@ -143,6 +143,24 @@ Store.prototype = {
   },
   bind: function (key) {
     return new StoreBinding(this, key);
+  },
+  val: function(key) {
+    const me = this;
+    return function backwardCallback(update) {
+      me.sub(key, val => update(val));
+    }
+  },
+  valEqual: function(key, val) {
+    const me = this;
+    return function backwardCallback(update) {
+      me.equal(key, val, compareResult => update(compareResult));
+    }
+  },
+  valTrue: function(key) {
+    return this.valEqual(key, true);
+  },
+  valFalse: function(key) {
+    return this.valEqual(key, false);
   }
 };
 const StoreBinding = function(store, key){

src/view/page/account/Account.jsx

@@ -3,7 +3,7 @@ export default D.declare('view.page.Account', ()=>
   <div>
     Account Page
     <div>
-        Hello, {_=>store.sub('account.name', account=> _(account))}
+        Hello, {store.val('account.name')}
     </div>
   </div>
 )

src/view/page/login/Login.jsx

@@ -21,7 +21,7 @@ export default D.declare('view.page.Login', () => {
                 <view.cmp.field.LabeledField label={'Login'} bind={loginStore.bind('phone')}/>,
                 <button
                     onclick={()=>loginStore.set('active', 'enterCode')}
-                    disabled={_=>loginStore.equal('phoneValid', false, _)}
+                    disabled={loginStore.valFalse('phoneValid')}
                 >Ага</button>
             ],
             enterCode: [