'init'

app/providers/MemoryProvider/useMemory.ts

@@ -0,0 +1,27 @@
+import { useContext } from "react";
+import { MemoryContext } from "./MemoryProvider";
+
+export function useMemory<T>(selector : string, def : T, writable : boolean = true) : [T, (value: T | ((prevValue: T) => T)) => void] {
+    const {memory, setMemory} = useContext(MemoryContext);
+    const value = () => {
+        if(memory[selector] == undefined){
+            return def;
+        }
+        return memory[selector];
+    };
+    const setValue = (value: T | ((prevValue: T) => T)) => {
+        if (!writable && memory[selector] == undefined) {
+            return;
+        }
+        const newValue = typeof value === "function" ? 
+            (value as (prevValue: T) => T)(memory[selector] ?? def) 
+                : value;
+        setMemory((prev : any) => ({
+            ...prev,
+            [selector]: typeof value === "function"
+                ? (value as (prevValue: T) => T)(prev[selector] ?? def)
+                : newValue,
+        }));
+    }
+    return [value(), setValue];
+}