From b21144e87d69b7b656d5028b9a6d59e222c4354c Mon Sep 17 00:00:00 2001
From: Roman Timashev <roman@tmshv.ru>
Date: Thu, 3 Mar 2016 01:29:17 +0300
Subject: [PATCH] + common utils: unique, assign, map

---
 src/utils/common.js | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/src/utils/common.js b/src/utils/common.js
index dbc8b546..f445eee0 100644
--- a/src/utils/common.js
+++ b/src/utils/common.js
@@ -51,4 +51,31 @@ export function select(byCondition, map = i => i) {
  */
 export function choise(scope, selector){
     return scope.reduce(selector, null);
-}
\ No newline at end of file
+}
+
+export function unique(fn) {
+    return list => [...new Set(list.map(fn))];
+}
+
+export function branch(fn) {
+    let keys = unique(fn);
+
+    return list => keys(list)
+        .reduce((dict, key) => {
+            dict[key] = list.filter(
+                i => fn(i) === key
+            );
+
+            return dict;
+        }, {})
+
+}
+
+export function assign(dict, key, value){
+    dict[key] = value;
+    return dict;
+}
+
+export function map(v, fn) {
+    return value => fn(value) ? v : value;
+}