Introduction to Enmap

Enmap (Enhanced Map) is an open-source key-value database for Node.js designed to be easy to use yet powerful. It allows developers to use a simple map-like API to interact with persistent data storage, making it a great choice for applications that require fast and efficient database operations.

Getting Started

To install Enmap, you can use npm:

npm install enmap

To initialize Enmap:

const Enmap = require('enmap'); const myEnmap = new Enmap({ name: 'mydatabase' });

Setting and Getting Data

Setting a value in Enmap is as simple as using the set method.

myEnmap.set('key', 'value');

To retrieve the value:

console.log(myEnmap.get('key')); // Output: 'value'

Deleting Data

You can easily delete a key-value pair with the delete method:

myEnmap.delete('key');

Checking Existence

To check if a key exists, use the has method:

console.log(myEnmap.has('key')); // Output: false

Incrementing and Decrementing

Enmap allows you to increment or decrement values directly:

 myEnmap.set('counter', 1); myEnmap.inc('counter'); console.log(myEnmap.get('counter')); // Output: 2 myEnmap.dec('counter'); console.log(myEnmap.get('counter')); // Output: 1 

Fetching All Entries

You can fetch all entries in the Enmap with:

myEnmap.fetchEverything().forEach((value, key) => { console.log(key, value); });

Filtering Data

Filter data stored in Enmap using the filter method:

const filterResults = myEnmap.filter((value, key) => value.startsWith('a'));

Enmap in a Real Application

Below is an example of how you might use Enmap in a simple application to store user data:

 const Enmap = require('enmap'); const userData = new Enmap({ name: 'userData' });
// Adding user data userData.set('user1', { name: 'Alice', age: 25 }); userData.set('user2', { name: 'Bob', age: 30 });
// Retrieving user data console.log(userData.get('user1')); // Output: { name: 'Alice', age: 25 }
// Checking user existence console.log(userData.has('user2')); // Output: true
// Updating user data userData.set('user1.age', 26);
// Deleting user data userData.delete('user2'); 

In this example, user data is stored and managed efficiently using the Enmap API.

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