Benchmark: Test fast deep equal

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.20/lodash.min.js"></script>

Script Preparation code:

function equal(a, b) {
  if (a === b) return true;

  if (a && b && typeof a == 'object' && typeof b == 'object') {
    if (a.constructor !== b.constructor) return false;

    var length, i, keys;
    if (Array.isArray(a)) {
      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 (a.constructor === RegExp) return a.source === b.source && a.flags === b.flags;
    if (a.valueOf !== Object.prototype.valueOf) return a.valueOf() === b.valueOf();
    if (a.toString !== Object.prototype.toString) return a.toString() === b.toString();

    keys = Object.keys(a);
    length = keys.length;
    if (length !== Object.keys(b).length) return false;

    for (i = length; i-- !== 0;)
      if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false;

    for (i = length; i-- !== 0;) {
      var key = keys[i];

      if (!equal(a[key], b[key])) return false;
    }

    return true;
  }

  // true if both NaN, false otherwise
  return a!==a && b!==b;
};

// 1 level deep
var data = [
                    {
                        description: 'equal numbers',
                        value1: 1,
                        value2: 1,
                        equal: true,
                    },
                    {
                        description: 'not equal numbers',
                        value1: 1,
                        value2: 2,
                        equal: false,
                    },
                    {
                        description: 'number and array are not equal',
                        value1: 1,
                        value2: [],
                        equal: false,
                    },
                    {
                        description: '0 and null are not equal',
                        value1: 0,
                        value2: null,
                        equal: false,
                    },
                    {
                        description: 'equal strings',
                        value1: 'a',
                        value2: 'a',
                        equal: true,
                    },
                    {
                        description: 'big object',
                        value1: {
                            prop1: 'value1',
                            prop2: 'value2',
                            prop3: 'value3',
                            prop4: {
                                subProp1: 'sub value1',
                                subProp2: {
                                    subSubProp1: 'sub sub value1',
                                    subSubProp2: [
                                        1,
                                        2,
                                        { prop2: 1, prop: 2 },
                                        4,
                                        5,
                                    ],
                                },
                            },
                            prop5: 1000,
                            prop6: new Date(2016, 2, 10),
                        },
                        value2: {
                            prop5: 1000,
                            prop3: 'value3',
                            prop1: 'value1',
                            prop2: 'value2',
                            prop6: new Date('2016/03/10'),
                            prop4: {
                                subProp2: {
                                    subSubProp1: 'sub sub value1',
                                    subSubProp2: [
                                        1,
                                        2,
                                        { prop2: 1, prop: 2 },
                                        4,
                                        5,
                                    ],
                                },
                                subProp1: 'sub value1',
                            },
                        },
                        equal: true,
                    },
                ];

Tests:

lodash
data.forEach((item) => { _.isEqual(item.value1, item.value2); });
fast-deep-equal
data.forEach((item) => { equal(item.value1, item.value2); });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash
fast-deep-equal

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 and explain what's being tested, compared, and their pros and cons.

**Benchmark Overview**

The benchmark is designed to measure the performance of two JavaScript functions: `_.isEqual` from the Lodash library and a custom function named `equal`. Both functions are used to compare the equality of two values in an array.

**Custom Function (Fast-Deep-Equal)**

The custom function `equal` is responsible for checking if two values are equal. It's designed to handle nested objects, arrays, and primitive types. Here's a high-level overview of its logic:

1. Checks if both values are equal using the `===` operator.
2. If one value is an object and the other is not, it returns false.
3. If both values are objects, it checks their constructors, lengths, and keys to ensure they're equal.

**Lodash Function (_.isEqual)**

The Lodash function `_.`(isEqual) is designed to check if two values are equal. It's a more comprehensive implementation than the custom `equal` function.

1. Handles nested objects, arrays, and primitive types.
2. Uses a recursive approach to compare the equality of complex data structures.

**Comparison**

Both functions aim to achieve the same goal: checking if two values are equal. However, they differ in their approach:

* The `equal` function uses a more straightforward, iterative approach, which might be faster for small arrays but could become slower for larger datasets.
* The Lodash `_.`(isEqual) function is more comprehensive and optimized for performance, making it suitable for handling large datasets.

**Pros and Cons**

**Custom Function (Fast-Deep-Equal)**

Pros:

* Simpler implementation
* Might be faster for small arrays

Cons:

* Less comprehensive than the Lodash implementation
* May not handle complex data structures as well

**Lodash Function (_.isEqual)**

Pros:

* Comprehensive implementation that handles most cases
* Optimized for performance

Cons:

* More complex implementation
* Might have a slight overhead due to its recursive nature

**Other Considerations**

* The benchmark uses the `forEach` method, which might not be the best approach for measuring performance. Other methods like `for` loops or `map` functions could provide more accurate results.
* The Lodash library is included via a CDN, which might introduce additional overhead.

Overall, both implementations have their strengths and weaknesses. While the custom `equal` function is simple and lightweight, it's less comprehensive than the Lodash implementation. In contrast, the Lodash `_.`(isEqual) function offers better performance and handling of complex data structures, making it a more suitable choice for large-scale applications.

Related benchmarks:

Test fast deep equal (version: 0)

Comparing performance of: lodash vs fast-deep-equal

Created: 4 years ago by: Guest

Jump to the latest result

lodash

fast-deep-equal

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):