@blazediff/object

Lightning-fast structural object comparison with detailed change tracking. High-performance algorithm optimized for real-world data structures.

Installation


npm install @blazediff/object


pnpm add @blazediff/object


yarn add @blazediff/object


bun add @blazediff/object

Features

High Performance - Optimized algorithm with intelligent key lookup strategies
Precise Tracking - Detailed path tracking for nested object modifications
Comprehensive Types - Handles primitives, objects, arrays, dates, regex, and circular references
Memory Efficient - Minimal overhead with consistent object shapes for V8 optimization
Cycle Detection - Built-in circular reference handling with configurable detection
Rich Output - Detailed difference objects with type, path, value, and oldValue information

Quick Start


import diff from '@blazediff/object';
 
const oldObj = {
  name: "John",
  age: 30,
  city: "NYC",
  skills: ["JavaScript", "TypeScript"]
};
 
const newObj = {
  name: "John",
  age: 31,
  city: "San Francisco",
  skills: ["JavaScript", "TypeScript", "Go"],
  active: true
};
 
const changes = diff(oldObj, newObj);
console.log(changes);

Output:


[
  {
    "type": 2,
    "path": ["age"],
    "value": 31,
    "oldValue": 30
  },
  {
    "type": 2,
    "path": ["city"],
    "value": "San Francisco",
    "oldValue": "NYC"
  },
  {
    "type": 0,
    "path": ["skills", 2],
    "value": "Go",
    "oldValue": undefined
  },
  {
    "type": 0,
    "path": ["active"],
    "value": true,
    "oldValue": undefined
  }
]

API Reference

`diff(oldObj, newObj, options?)`

Compares two objects and returns an array of differences.

Parameters

Parameter	Type	Description
`oldObj`	`any`	The original object to compare from
`newObj`	`any`	The new object to compare to
`options`	`object`	Configuration options (optional)

Options

Option	Type	Default	Description
`detectCycles`	`boolean`	`true`	Enable circular reference detection

Returns

Returns Difference[] - Array of difference objects with consistent structure:


interface Difference {
  type: DifferenceType;
  path: (string | number)[];
  value: any;
  oldValue: any;
}

Difference Types

Difference Types are represented as numbers for optimal performance:

Type	Name	Description
`0`	`CREATE`	Property or array element was added
`1`	`REMOVE`	Property or array element was deleted
`2`	`CHANGE`	Property or array element was modified

All difference objects maintain consistent shape with type, path, value, and oldValue fields for optimal V8 performance.