diff --git a/src/Updux.js b/src/Updux.js
index d9dc51d..9ea46e2 100644
--- a/src/Updux.js
+++ b/src/Updux.js
@@ -3,6 +3,7 @@ import u from '@yanick/updeep';
 
 import { buildInitial } from './buildInitial/index.js';
 import { buildActions }  from './buildActions/index.js';
+import { buildSelectors }  from './buildSelectors/index.js';
 import { action } from './actions.js';
 
 
@@ -17,17 +18,18 @@ export class Updux {
     #initial = {};
     #subduxes = {};
     #actions = {};
+    #selectors = {};
 
     constructor(config) {
         this.#initial = config.initial ?? {};
-
         this.#subduxes = config.subduxes ?? {};
-
         this.#actions = config.actions ?? {};
+        this.#selectors = config.selectors ?? {};
     }
 
     #memoInitial = moize( buildInitial );
     #memoActions = moize(buildActions);
+    #memoSelectors = moize(buildSelectors);
 
     get initial() {
         return this.#memoInitial(this.#initial,this.#subduxes);
@@ -38,7 +40,7 @@ export class Updux {
     }
 
     get selectors() {
-        return {};
+        return this.#memoSelectors(this.#selectors,this.#subduxes);
     }
 
     addAction(type, payloadFunc) {
@@ -50,6 +52,7 @@ export class Updux {
     }
 
     addSelector(name, func) {
-        return;
+        this.#selectors[name] = func;
+        return func;
     }
 }
diff --git a/src/buildSelectors/index.js b/src/buildSelectors/index.js
new file mode 100644
index 0000000..9e03942
--- /dev/null
+++ b/src/buildSelectors/index.js
@@ -0,0 +1,12 @@
+import { map, mapValues, merge } from 'lodash-es';
+
+export function buildSelectors(localSelectors, subduxes) {
+    const subSelectors = map(subduxes, ({ selectors }, slice) => {
+        if (!selectors) return {};
+
+        return mapValues(selectors, (func) => (state) => func(state[slice]));
+    });
+
+    console.log(subSelectors);
+    return merge({}, ...subSelectors, localSelectors);
+}
diff --git a/src/buildSelectors/index.ts b/src/buildSelectors/index.ts
deleted file mode 100644
index 1c8ce3a..0000000
--- a/src/buildSelectors/index.ts
+++ /dev/null
@@ -1,27 +0,0 @@
-import fp from 'lodash/fp';
-import Updux from '..';
-import { Dictionary, Selector } from '../types';
-
-function subSelectors([slice, selectors]: [string, Function]): [string, Selector][] {
-    if (!selectors) return [];
-
-    return Object.entries(
-        fp.mapValues(selector => (state: any) =>
-            (selector as any)(state[slice])
-        )(selectors as any)
-    );
-}
-
-export default function buildSelectors(
-    localSelectors: Dictionary<Selector> = {},
-    coduxes: Dictionary<Selector>[] = [],
-    subduxes: Dictionary<Selector> = {}
-) {
-    return Object.fromEntries(
-        [
-            Object.entries(subduxes).flatMap(subSelectors),
-            Object.entries(coduxes),
-            Object.entries(localSelectors),
-        ].flat()
-    );
-}