fast-deep-equal vs deep-equal
Deep Equality Comparison in JavaScript
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Deep Equality Comparison in JavaScript

Deep equality comparison libraries in JavaScript are tools that allow developers to check if two values (objects, arrays, primitives) are equal in terms of their structure and content, rather than just their reference in memory. This is particularly useful for comparing complex data structures, ensuring that they have the same properties, values, and nested structures. These libraries implement algorithms to traverse and compare values recursively, handling various data types, including arrays, objects, dates, and more. They are commonly used in testing, state management, and any scenario where precise equality checks are needed. deep-equal is a robust library that provides a comprehensive solution for deep equality checks, handling a wide range of data types and edge cases. fast-deep-equal, on the other hand, is optimized for performance, offering a lightweight solution for deep equality comparisons with a focus on speed, making it ideal for scenarios where performance is critical.

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fast-deep-equal114,451,5922,042-356 years agoMIT
deep-equal21,492,36879490.3 kB42 years agoMIT

Feature Comparison: fast-deep-equal vs deep-equal

Performance

  • fast-deep-equal:

    fast-deep-equal is optimized for performance, making it one of the fastest libraries for deep equality comparisons. It is particularly efficient for comparing large arrays and objects, making it a great choice for performance-sensitive applications.

  • deep-equal:

    deep-equal is designed for accuracy rather than speed. While it handles deep equality checks comprehensively, it may not be the fastest option for large or deeply nested structures due to its thoroughness in handling various data types and edge cases.

Accuracy

  • fast-deep-equal:

    fast-deep-equal offers accurate comparisons for most standard data types, including nested objects and arrays. However, it may not handle all edge cases as comprehensively as deep-equal, which could lead to missed equality in some more complex structures.

  • deep-equal:

    deep-equal provides a highly accurate comparison of values, including support for complex data types such as Maps, Sets, and custom objects. It handles a wide range of edge cases, ensuring reliable equality checks in various scenarios.

Size

  • fast-deep-equal:

    fast-deep-equal is a lightweight library with a minimal footprint, making it an excellent choice for projects where bundle size is a concern. Its simplicity and focus on performance contribute to its small size.

  • deep-equal:

    deep-equal is relatively small, but it is larger than fast-deep-equal due to its comprehensive nature and the additional features it provides for handling a wider variety of data types and edge cases.

Ease of Use

  • fast-deep-equal:

    fast-deep-equal also offers a simple and intuitive API for performing deep equality checks. Its focus on performance does not compromise usability, and the documentation is concise and helpful.

  • deep-equal:

    deep-equal has a straightforward API that makes it easy to use for deep equality comparisons. Its documentation is clear, and it provides examples that help developers understand how to use the library effectively.

Example Code

  • fast-deep-equal:

    Fast deep equality check with fast-deep-equal

    import isEqual from 'fast-deep-equal';

const objA = { x: 10, y: { z: 20 } };
const objB = { x: 10, y: { z: 20 } };
const objC = { x: 10, y: { z: 30 } };

console.log(isEqual(objA, objB)); // true
console.log(isEqual(objA, objC)); // false
  • deep-equal:

    Deep equality check with deep-equal

    import deepEqual from 'deep-equal';

const obj1 = { a: 1, b: { c: 2 } };
const obj2 = { a: 1, b: { c: 2 } };
const obj3 = { a: 1, b: { c: 3 } };

console.log(deepEqual(obj1, obj2)); // true
console.log(deepEqual(obj1, obj3)); // false

How to Choose: fast-deep-equal vs deep-equal

  • fast-deep-equal:

    Choose fast-deep-equal if you require a high-performance solution for deep equality checks and are working with large or complex data structures. It is ideal for applications where speed is crucial, and you can trade off some of the comprehensive handling of edge cases for faster comparisons.

  • deep-equal:

    Choose deep-equal if you need a thorough and reliable deep equality comparison that handles a wide variety of data types and edge cases. It is particularly useful in testing and scenarios where accuracy is paramount, and performance is not the primary concern.

Similar Npm Packages to fast-deep-equal

fast-deep-equal is a lightweight and efficient library for deep equality checks in JavaScript. It provides a fast way to compare two values to determine if they are deeply equal, making it particularly useful in scenarios where performance is critical, such as in React applications for preventing unnecessary re-renders. While fast-deep-equal is a popular choice for deep comparison, there are several alternatives available in the JavaScript ecosystem. Here are a few notable ones:

  • deep-eql is a library that provides deep equality checks for JavaScript objects. It is designed to handle complex data structures and offers a comprehensive comparison mechanism. deep-eql is particularly useful when you need a robust solution for comparing objects that may contain nested structures or special types, such as dates or regular expressions. If you require a thorough comparison with detailed handling of various data types, deep-eql is a solid choice.

  • deep-equal is another library that performs deep equality checks. It is straightforward and easy to use, making it suitable for most common use cases. deep-equal is designed to handle various data types and structures, providing a reliable way to compare objects and arrays. If you are looking for a simple and effective solution for deep comparisons without the need for advanced features, deep-equal might be the right fit.

  • is-equal is a utility library that offers deep equality checks for JavaScript values. It is lightweight and focuses on providing a simple API for comparing values. is-equal is particularly useful for quick comparisons and can be easily integrated into existing projects. If you need a minimalistic approach to deep equality checks without additional overhead, is-equal is a great option.

  • lodash.isequal is part of the Lodash library, a widely-used utility library in JavaScript. The isEqual function from Lodash provides deep equality checks with extensive support for various data types and structures. If you are already using Lodash in your project, leveraging lodash.isequal for deep comparisons can be convenient and efficient.

To see how fast-deep-equal compares with deep-eql, deep-equal, is-equal, and lodash.isequal, check out the comparison: Comparing deep-eql vs deep-equal vs fast-deep-equal vs is-equal vs lodash.isequal.

Similar Npm Packages to deep-equal

deep-equal is a JavaScript library used for deep comparison of objects and arrays. It provides a straightforward way to determine if two values are equivalent, taking into account nested structures and complex data types. This can be particularly useful in scenarios where you need to compare state or props in React applications, or when validating data structures in various JavaScript applications. The library is easy to use and can handle a wide range of data types, making it a popular choice for developers needing reliable deep equality checks.

An alternative to deep-equal is fast-deep-equal. As the name suggests, this library is optimized for performance, providing a faster implementation for deep equality checks. It is particularly beneficial when working with large or complex data structures, where performance can be a concern. fast-deep-equal maintains a similar API to deep-equal, making it easy to switch between the two if performance becomes a priority in your application.

For a detailed comparison of these two libraries, you can visit: Comparing deep-equal vs fast-deep-equal.

README for fast-deep-equal

fast-deep-equal

The fastest deep equal with ES6 Map, Set and Typed arrays support.

Build Status npm Coverage Status

Install

npm install fast-deep-equal

Features

  • ES5 compatible
  • works in node.js (8+) and browsers (IE9+)
  • checks equality of Date and RegExp objects by value.

ES6 equal (require('fast-deep-equal/es6')) also supports:

  • Maps
  • Sets
  • Typed arrays

Usage

var equal = require('fast-deep-equal');
console.log(equal({foo: 'bar'}, {foo: 'bar'})); // true

To support ES6 Maps, Sets and Typed arrays equality use:

var equal = require('fast-deep-equal/es6');
console.log(equal(Int16Array([1, 2]), Int16Array([1, 2]))); // true

To use with React (avoiding the traversal of React elements' _owner property that contains circular references and is not needed when comparing the elements - borrowed from react-fast-compare):

var equal = require('fast-deep-equal/react');
var equal = require('fast-deep-equal/es6/react');

Performance benchmark

Node.js v12.6.0:

fast-deep-equal x 261,950 ops/sec ±0.52% (89 runs sampled)
fast-deep-equal/es6 x 212,991 ops/sec ±0.34% (92 runs sampled)
fast-equals x 230,957 ops/sec ±0.83% (85 runs sampled)
nano-equal x 187,995 ops/sec ±0.53% (88 runs sampled)
shallow-equal-fuzzy x 138,302 ops/sec ±0.49% (90 runs sampled)
underscore.isEqual x 74,423 ops/sec ±0.38% (89 runs sampled)
lodash.isEqual x 36,637 ops/sec ±0.72% (90 runs sampled)
deep-equal x 2,310 ops/sec ±0.37% (90 runs sampled)
deep-eql x 35,312 ops/sec ±0.67% (91 runs sampled)
ramda.equals x 12,054 ops/sec ±0.40% (91 runs sampled)
util.isDeepStrictEqual x 46,440 ops/sec ±0.43% (90 runs sampled)
assert.deepStrictEqual x 456 ops/sec ±0.71% (88 runs sampled)

The fastest is fast-deep-equal

To run benchmark (requires node.js 6+):

npm run benchmark

Please note: this benchmark runs against the available test cases. To choose the most performant library for your application, it is recommended to benchmark against your data and to NOT expect this benchmark to reflect the performance difference in your application.

Enterprise support

fast-deep-equal package is a part of Tidelift enterprise subscription - it provides a centralised commercial support to open-source software users, in addition to the support provided by software maintainers.

Security contact

To report a security vulnerability, please use the Tidelift security contact. Tidelift will coordinate the fix and disclosure. Please do NOT report security vulnerability via GitHub issues.

License

MIT

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