🌊 Node Collection Library

Data Manipulation, Evolved. Bring the magical experience of Laravel Collections to the Node.js ecosystem with perfect Type-Safety and 4-Dimensional Processing.

✨ Features

• 🛡️ 100% Type-Safe: Advanced Generics inference. Auto-complete will never break even if you chain 100 functions. Say goodbye to manual type casting.
• ⚡ 4-Dimensional Engines: Switch between Sync Eager, Sync Lazy, Async Eager, and Async Lazy seamlessly.
• 📦 Zero-RAM Overhead: Process massive datasets (GBs) using the Lazy "Matryoshka" Pattern. Execution is deferred until strictly necessary.
• 🧩 Pluggable Architecture: Micro-kernel design. Build custom operators for your projects as easily as calling a single function.
• 🎸 Laravel-style API: Familiar declarative methods like where, pluck, tap, first, and dozens more.

🚀 Installation

pnpm add node-collection
# or
npm install node-collection

📖 Quick Start

Transform hundreds of lines of imperative, messy code into a single, elegant chain.

import { collect } from 'node-collection';

const users = [
  { id: 1, name: 'Suhu Elhakim', status: 'ACTIVE', role: 'Architect' },
  { id: 2, name: 'Junior Dev', status: 'INACTIVE', role: 'Developer' },
  { id: 3, name: 'Mid Dev', status: 'ACTIVE', role: 'Developer' },
];

const result = collect(users)
  .where('status', 'ACTIVE') // 1. Filter active users
  .where('role', '!==', 'Architect') // 2. Exclude Architects
  .pluck('name') // 3. Extract just the names
  .tap((name) => console.log(`Found: ${name}`)) // 4. Introspect safely
  .first(); // 5. Short-circuit & return

console.log(result); // "Mid Dev"

🧠 Architectural Insights

Node Collection isn't just another array wrapper. It is built from the ground up to solve real enterprise problems in Node.js.

1. The 4-Dimension Engines

Native JavaScript Array.prototype is entirely Sync Eager. If you process a 5GB CSV file using .map().filter(), your Node.js server will crash with an Out of Memory (OOM) error. We solve this by introducing 4 distinct engines that intelligently adapt to your data source:

• Sync Eager (Collection): Best for standard memory-bound arrays. Immediate execution.
• Sync Lazy (LazyCollection): Powered by JavaScript Generators (function*). Processes data sequentially.
• Async Eager (AsyncCollection): Handles Arrays of Promises. Resolves data concurrently via Promise.all for maximum throughput.
• Async Lazy (AsyncLazyCollection): Powered by Async Generators (for await...of). Perfect for consuming live Network Streams or Database Cursors with zero memory bloating.

2. The Matryoshka Pattern (Short-Circuiting)

In our Lazy engines, operations are wrapped like Russian nesting dolls.

If you chain .filter().map().take(5), the engine does not iterate over the entire array three times. Instead, data flows through the chain one item at a time. The moment .take(5) receives its 5th item, it triggers a break command that propagates upwards, completely halting the upstream generator. You process only what you need.

3. Extreme Type Inference

Our Generics architecture uses Declaration Merging and strict keyof constraints. The compiler acts as your co-pilot. When you call .pluck('email'), the returned Collection strictly mutates into Collection<string>. Subsequent operators will perfectly suggest string-based methods.

🛠️ Operator Dictionary

We structure our API into logical groupings so you can find exactly what you need:

🏗️ Foundational

• filter(fn) - Keep items passing the truth test.
• where(key, operator?, value?) - The ultimate dynamic filter.
• take(limit) - Slice the collection (triggers short-circuit in lazy mode).

🪄 Transformation

• map(fn) - Transform items to a new shape.
• pluck(key) - Extract a single property dynamically.

🔍 Debugging

• tap(fn) - Peek into the pipeline without altering the data.

🛑 Terminal (Execution Triggers)

• first(fn?) - Resolve the chain and return the first matching item.
• all() - Resolve the chain into a standard JavaScript Array.

🧩 Extending (Micro-Kernel Architecture)

Node Collection is built to be extended. You can register custom operators globally without touching the core library using our defineOperator API and Virtual Method Table (vTable) registry.

import { defineOperator, Collection } from 'node-collection';

// 1. Define the type signature
declare module 'node-collection/contracts' {
  interface EnumerableMethods<T> {
    dd(): void; // Dump and Die
  }
}

// 2. Implement the logic safely
defineOperator('dd', Collection, function (ctx) {
  console.dir(ctx.all(), { depth: null, colors: true });
  process.exit(1);
});

🗺️ The Roadmap

We are committed to making Node Collection the standard data manipulation library for Node.js. Here is our flight plan:

Phase 1: The Essentials (Current Focus)

• Core Micro-Kernel & vTable Registry.
• 4-Dimension Engine Implementation.
• Foundational Operators (where, map, filter, take, first, pluck, tap).
• Advanced Filtering (whereIn, whereBetween, whereNull, whereRegex).
• Aggregation Operators (reduce, sum, avg, min, max).

Phase 2: Structural Mastery

• Grouping (groupBy, partition).
• Sorting (sortBy, sortByDesc).
• Set Operations (unique, intersect, diff).
• Chunking & Pagination (chunk, forPage).

Phase 3: The I/O Ecosystem

• Native integration with Node.js ReadableStream & WritableStream.
• Out-of-the-box CSV and JSON stream parsers to Lazy Collections.
• File-system wrappers (collect.file('data.csv')).

Phase 4: Integrations & Benchmarks

• Official Prisma ORM Adapter.
• Official MongoDB Cursor Adapter.
• Comprehensive performance benchmark suite (k6/vitest) proving superiority over Lodash/Native JS.

📊 Quick Comparison

🤝 Contributing

We love contributions! Whether it's adding a new operator from the roadmap, fixing a bug, or improving docs:

1. Fork the Project.
2. Create your Feature Branch (git checkout -b feature/AmazingFeature).
3. Commit your Changes (git commit -m 'Add some AmazingFeature').
4. Push to the Branch (git push origin feature/AmazingFeature).
5. Open a Pull Request.

🌟 Support

If this library saves your server from OOM crashes or makes your code cleaner, please consider giving it a ⭐ on GitHub!

📄 License

MIT © ElhakimDev99