Benchmark: fast_deep_equal - lodash.isEqual

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>

AخA
 
<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>

Script Preparation code:

var isArray = Array.isArray;
var keyList = Object.keys;
var hasProp = Object.prototype.hasOwnProperty;

function equal(a, b) {
  if (a === b) return true;

  if (a && b && typeof a == 'object' && typeof b == 'object') {
    var arrA = isArray(a)
      , arrB = isArray(b)
      , i
      , length
      , key;

    if (arrA && arrB) {
      length = a.length;
      if (length != b.length) return false;
      for (i = length; i-- !== 0;)
        if (!equal(a[i], b[i])) return false;
      return true;
    }

    if (arrA != arrB) return false;

    var dateA = a instanceof Date
      , dateB = b instanceof Date;
    if (dateA != dateB) return false;
    if (dateA && dateB) return a.getTime() == b.getTime();

    var regexpA = a instanceof RegExp
      , regexpB = b instanceof RegExp;
    if (regexpA != regexpB) return false;
    if (regexpA && regexpB) return a.toString() == b.toString();

    var keys = keyList(a);
    length = keys.length;

    if (length !== keyList(b).length)
      return false;

    for (i = length; i-- !== 0;)
      if (!hasProp.call(b, keys[i])) return false;

    for (i = length; i-- !== 0;) {
      key = keys[i];
      if (!equal(a[key], b[key])) return false;
    }

    return true;
  }

  return a!==a && b!==b;
};

// 1 level deep
window.foo1 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };
window.bar1 = { a: 1, b: 3, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };

// 2 levels deep
window.foo2 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };
window.bar2 = { a: 1, b: 2, c: { a: 1, b: 3, c: { a: 1, b: 2 } } };

// 3 levels deep
window.foo3 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };
window.bar3 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 4 } } };

​x
 
var isArray = Array.isArray;var keyList = Object.keys;var hasProp = Object.prototype.hasOwnProperty;​function equal(a, b) {  if (a === b) return true;​  if (a && b && typeof a == 'object' && typeof b == 'object') {    var arrA = isArray(a)      , arrB = isArray(b)      , i      , length      , key;​    if (arrA && arrB) {      length = a.length;      if (length != b.length) return false;      for (i = length; i-- !== 0;)        if (!equal(a[i], b[i])) return false;      return true;    }​    if (arrA != arrB) return false;​    var dateA = a instanceof Date      , dateB = b instanceof Date;    if (dateA != dateB) return false;    if (dateA && dateB) return a.getTime() == b.getTime();​    var regexpA = a instanceof RegExp      , regexpB = b instanceof RegExp;    if (regexpA != regexpB) return false;    if (regexpA && regexpB) return a.toString() == b.toString();​    var keys = keyList(a);    length = keys.length;​    if (length !== keyList(b).length)      return false;​    for (i = length; i-- !== 0;)      if (!hasProp.call(b, keys[i])) return false;​    for (i = length; i-- !== 0;) {      key = keys[i];      if (!equal(a[key], b[key])) return false;    }​    return true;  }​  return a!==a && b!==b;};​// 1 level deepwindow.foo1 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };window.bar1 = { a: 1, b: 3, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };​// 2 levels deepwindow.foo2 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };window.bar2 = { a: 1, b: 2, c: { a: 1, b: 3, c: { a: 1, b: 2 } } };​// 3 levels deepwindow.foo3 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };window.bar3 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 4 } } };

Tests:

lodash
_.isEqual(window.foo1, window.bar1)
_.isEqual(window.foo1, window.bar1)
fast-deep-equal
equal(window.foo1, window.bar1);
equal(window.foo1, window.bar1);
JSON
JSON.stringify(window.foo1) === JSON.stringify(window.bar1);
JSON.stringify(window.foo1) === JSON.stringify(window.bar1);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Experimental features:

Memory measurements supported only in Chrome.
For precise memory measurements Chrome must be launched with --enable-precise-memory-info flag.
More information: Monitoring JavaScript Memory

Test case name	Result
lodash
fast-deep-equal
JSON

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/112.0

Browser/OS: Firefox 112 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
lodash	638070.2 Ops/sec
fast-deep-equal	649338.2 Ops/sec
JSON	434104.6 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 5 months ago):

I'll break down the provided benchmark definition and explain what's being tested, compared, and their pros and cons.

Benchmark Definition

The benchmark is defined as a JSON object that contains three test cases:

_.isEqual(window.foo1, window.bar1): Tests the implementation of the isEqual function from the Lodash library.
equal(window.foo1, window.bar1);: Tests the custom implementation of the fast-deep-equal function.
JSON.stringify(window.foo1) === JSON.stringify(window.bar1);: Tests the equality of two JSON strings.

Options Compared

The three test cases compare different approaches to deep equality checking:

Lodash's isEqual function: A widely used and well-tested library function for deep equality checks.
Custom implementation of fast-deep-equal: A custom function that attempts to outperform Lodash's isEqual function. However, this implementation has a higher chance of introducing bugs or performance issues.

Pros and Cons

Here are some pros and cons associated with each approach:

Lodash's isEqual function:
- Pros: Well-tested, widely adopted, and maintains consistency across different browsers.
- Cons: May not be the fastest option due to its complexity and dependency on other Lodash functions.
Custom implementation of fast-deep-equal:
- Pros: Can potentially outperform Lodash's isEqual function in terms of performance.
- Cons: Higher risk of introducing bugs or performance issues, as it's a custom implementation with less testing and validation.

Library and Its Purpose

The Lodash library is a popular JavaScript utility library that provides a set of functions for various tasks, including deep equality checks. In this benchmark, the isEqual function from Lodash is used to test its implementation.

Special JS Features or Syntax

There are no special JS features or syntax used in these benchmarks. The focus is on testing the performance and correctness of different approaches to deep equality checks.

Other Alternatives

If you're interested in exploring alternative libraries or implementations for deep equality checks, here are a few options:

Underscore.js: Another popular JavaScript utility library that provides a deepEqual function similar to Lodash's isEqual.
fast-deep-equal: A lightweight implementation of the fast-deep-equal algorithm, which is also used in this benchmark.
** JSON-based equality checks**: Some libraries or implementations use JSON-based approaches for deep equality checks, such as comparing JSON strings.

Keep in mind that these alternatives may have different strengths and weaknesses compared to Lodash's isEqual function.

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark definition and explain what's being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark is defined as a JSON object that contains three test cases:

1. `_.isEqual(window.foo1, window.bar1)`: Tests the implementation of the `isEqual` function from the Lodash library.
2. `equal(window.foo1, window.bar1);`: Tests the custom implementation of the `fast-deep-equal` function.
3. `JSON.stringify(window.foo1) === JSON.stringify(window.bar1);`: Tests the equality of two JSON strings.

**Options Compared**

The three test cases compare different approaches to deep equality checking:

* **Lodash's `isEqual` function**: A widely used and well-tested library function for deep equality checks.
* **Custom implementation of `fast-deep-equal`**: A custom function that attempts to outperform Lodash's `isEqual` function. However, this implementation has a higher chance of introducing bugs or performance issues.

**Pros and Cons**

Here are some pros and cons associated with each approach:

* **Lodash's `isEqual` function**:
	+ Pros: Well-tested, widely adopted, and maintains consistency across different browsers.
	+ Cons: May not be the fastest option due to its complexity and dependency on other Lodash functions.
* **Custom implementation of `fast-deep-equal`**:
	+ Pros: Can potentially outperform Lodash's `isEqual` function in terms of performance.
	+ Cons: Higher risk of introducing bugs or performance issues, as it's a custom implementation with less testing and validation.

**Library and Its Purpose**

The Lodash library is a popular JavaScript utility library that provides a set of functions for various tasks, including deep equality checks. In this benchmark, the `isEqual` function from Lodash is used to test its implementation.

**Special JS Features or Syntax**

There are no special JS features or syntax used in these benchmarks. The focus is on testing the performance and correctness of different approaches to deep equality checks.

**Other Alternatives**

If you're interested in exploring alternative libraries or implementations for deep equality checks, here are a few options:

* **Underscore.js**: Another popular JavaScript utility library that provides a `deepEqual` function similar to Lodash's `isEqual`.
* **fast-deep-equal**: A lightweight implementation of the fast-deep-equal algorithm, which is also used in this benchmark.
* ** JSON-based equality checks**: Some libraries or implementations use JSON-based approaches for deep equality checks, such as comparing JSON strings.

Keep in mind that these alternatives may have different strengths and weaknesses compared to Lodash's `isEqual` function.

Related benchmarks:

fast_deep_equal - lodash.isEqual (version: 0)

Comparing performance of: lodash vs fast-deep-equal vs JSON

Created: 6 years ago by: Guest

Jump to the latest result

lodash

fast-deep-equal

JSON

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 5 months ago):