Benchmark: fast_deep_equal - lodash.isEqual

HTML Preparation code:

<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 } } };

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash
fast-deep-equal
JSON

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

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: 7 years ago by: Guest

Jump to the latest result

lodash

fast-deep-equal

JSON

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):