data/file.json

@@ -0,0 +1 @@
+[{"key":"ciao","value":"hello"},{"key":"arrivederci","value":"bye"}]

readme.md

@@ -1,34 +1,14 @@
 # Mit.db
 
-MapDB A Map that stores data locally and loads it at startup. Written in JavaScript
-
-### How does it work?
-
-Map.db works just like the JavaScript built-in **Map**, with the same methods and functionalities, and in fact it uses itself a Map, but while the built-in Map only stores data in internal memory, this module **stores data locally in a file and loads it back in the Map at startup**.
-
-The purpose of this module is to make the JavaScript built-in Map an actual **database**, and there comes the name `mit.db`: a Map that can be used as a database.
-
-The file structure is easily accessible and the data is stored in JSON format, allowing manual editing
-
-You also have the option to only use local storage without touching internal memory
-
-### Differences
-
-Although this module works in fact the same way as a Map, there are still some little differences between them, which are listed below:
-
-> - `Mit#set()` and `Mit#delete()` return **promises**
-> - When a value is reassigned to a key, it is only saved in the Map but not in the actual save file, so you always have to **set the key/value pair with the new value**.
-> Example:
-
 ```js
-const { MapDB } = require('mit.db');
+const MitDB = require('mit.db');
-const mapdb = new MapDB('file.db'); // this is the save file's name + extension
+const db = new MitDB('file.db'); // this is the save file's name + extension
 async function sample() {
     // assuming 'somekey' exists in the Map and has a value { cool: false }
-    const data = mapdb.get('somekey');
+    const data = db.get('somekey');
     // reassigning the 'cool' property a new value
     data.cool = true;
-    await mapdb.set('somekey', data);
+    await db.set('somekey', data);
     // now 'somekey' has a new value { cool: true }
 }
 ```
@@ -52,11 +32,66 @@ const db = new MapDB('database.json') // this is the save file's name + extensio
 #### set()
 
 ```js
-await db.set('what', 'how')
+    await db.set('ciao', 'hello')
+    await db.set('arrivederci', 'bye')
 ```
 
 #### get()
 
 ```js
-var answ = db.get('what') // answ = how
+var ansa = db.get('ciao') // ansa = hello
+```
+
+#### has()
+
+```js
+var asnb = db.has('arrivederci') // ansb = true
+```
+
+#### entries()
+
+```js
+var ansc = db.entries() // ansc = [ 'ciao', 'hello' ], [ 'arrivederci', 'bye' ] ]
+```
+
+#### keys()
+
+```js
+var ansd = db.keys() // ansd = [ 'ciao', 'arrivederci' ]
+```
+
+#### values()
+
+```js
+var anse = db.values() // anse = [ 'hello', 'bye' ]
+```
+
+#### forEach()
+
+```js
+db.forEach((value, key) => console.log(value, key)) // console.log = hello ciao
+// console.log = bye arrivederci
+```
+
+#### delete()
+
+```js
+// [{"key":"ciao","value":"hello"}, {"key":"arrivederci","value":"bye"}]
+await db.delete('ciao')
+// [{"key":"arrivederci","value":"bye"}]
+```
+
+#### clear()
+
+```js
+// [{"key":"ciao","value":"hello"}, {"key":"arrivederci","value":"bye"}]
+await db.delete('ciao')
+// []
+```
+
+#### size()
+
+```js
+// [{"key":"ciao","value":"hello"}, {"key":"arrivederci","value":"bye"}]
+var ansf = db.size() // size = 2
 ```

src/index.ts

@@ -1,72 +1,143 @@
-import fsp from "fs/promises";
+import { promisify } from 'util';
-import fs from "fs";
+import * as fs from 'fs';
 
-let writeDB: any, map: any, filename: string | undefined = 'database.db', dirname: string = './data/', db: any, file: any, data: any;
+const writeDB = promisify(fs.writeFile);
 
-writeDB = fsp.writeFile;
+let map: any, db: any, filename: string, dirname: string = 'data';
 
-export class MitDB {
+class MitDB {
     /**
      * @constructor
      * @param filename If not set, MapDB will only use internal memory
      * @example 'file.db'
-     * @param options Options to pass to the constructor
+     * @param options Options to pass in the constructor
-     * @param options.dirname
+     * @param options.dirname where to put the database?
-     * @example 'data'
      */
-    constructor(fn: string | undefined, options: any) {
+    constructor(fn?: string, options?: { dirname: string }) {
         map = new Map();
 
         if (fn) filename = fn;
 
-        if (options.dirname) dirname = options.dirname;
+        if (options && options.dirname) dirname = options.dirname;
 
         if (!fs.existsSync(dirname)) fs.mkdirSync(dirname);
 
         db = `./${dirname}/${filename}`
-
-        try {
-            file = fs.readFileSync(db);
-            data = JSON.parse(file.toString());
-
-            for (let i = 0; i < data.length; i++) {
-                map.set(data[i].key, data[i].value);
-            }
-        } catch {}
     }
 
     /**
+     * 
      * @param key 
      * @param value 
      */
     async set(key: string | number, value: any) {
         try {
-            file = fs.readFileSync(db);
+            const file = fs.readFileSync(db);
-            data = JSON.parse(data);
+            const data: any[] = JSON.parse(file.toString());
+    
+            const i = data.findIndex((pair: any) => pair.key == key);
     
-            let i = data.findIndex((pair: any) => pair.key == key);
             !data[i] ? data.push({ key, value }) : data[i] = { key, value };
 
             await writeDB(db, JSON.stringify(data));
+            return data;
         } catch {
-            await await writeDB(db, `[${JSON.stringify({ key, value })}]`)
+            await writeDB(db, `[${JSON.stringify({ key, value })}]`).then(() => {
+                return JSON.parse(fs.readFileSync(db).toString());
+            });
         }
 
-        return map.set(key, value)
+        return 'error'
     }
 
     /**
+     * 
      * @param key 
      */
 
     get(key: string | number) {
-        if (map) {
+        const file = fs.readFileSync(db);
-            return map.get(key)
+        const data: any[] = JSON.parse(file.toString());
-        } else {
-            file = fs.readFileSync(db);
-            data = JSON.parse(file.toString());
 
         return data.find((pair: any) => pair.key == key)?.value || undefined;    
     }
+
+    /**
+     * 
+     * @param key 
+     */
+    has(key: string | number) {
+        const file = fs.readFileSync(db);
+        const data: any[] = JSON.parse(file.toString());
+
+        return data.find((pair: any) => pair.key == key) ? true : false;    
+    }
+
+    entries() {
+        const file = fs.readFileSync(db);
+        const data: any[] = JSON.parse(file.toString());
+
+        return data.map((pair: any) => [pair.key, pair.value]);
+    }
+
+    keys() {
+        const file = fs.readFileSync(db);
+        const data: any[] = JSON.parse(file.toString());
+
+        return data.map((pair: any) => pair.key);
+    }
+
+    values() {
+        const file = fs.readFileSync(db);
+        const data: any[] = JSON.parse(file.toString());
+
+        return data.map((pair: any) => pair.value);
+    }
+
+    /**
+     * 
+     * @param callbackfn 
+     */
+    forEach(callback: (value: any, key: any, map: Map<any, any>) => void) {
+        const file = fs.readFileSync(db);
+        const data: any[] = JSON.parse(file.toString());
+
+        data.forEach((pair: any) => callback(pair.value, pair.key, map));
+    }
+
+    /**
+     * 
+     * @param key 
+     */
+    async delete(key: string | number) {
+        try {
+            const file = fs.readFileSync(db);
+            const data: any[] = JSON.parse(file.toString());
+    
+            const i = data.findIndex((pair: any) => pair.key == key);
+    
+            if (data[i]) {
+                data.splice(i, 1);
+                await writeDB(db, JSON.stringify(data));
+
+                return true;
+            } else if (!map) {
+                return false;
+            }
+        } catch {}
+        return 'error';
+    }
+
+    async clear() {
+        await writeDB(db, JSON.stringify([])).catch(() => {});
+    }
+
+    size() {
+        const file = fs.readFileSync(db);
+        const data: any[] = JSON.parse(file.toString());
+
+        return data.length;
     }
 }
+
+export = MitDB;

test.js

@@ -0,0 +1,12 @@
+const MitDB = require('./build/index.js')
+
+var db = new MitDB('file.json')
+
+async function run () {
+    await db.set('ciao', 'hello')
+    await db.set('arrivederci', 'bye')
+
+    console.log(db.size())
+}
+
+run()