Benchmark: Fast deep equal vs strigify

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/fast-equals@5.0.1/dist/min/index.js"></script>

Script Preparation code:


// 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:

JSON
data.forEach((item) => { JSON.stringify(item.value1) === JSON.stringify(item.value2); });
fast equal
data.forEach((item) => { window["fast-equals"].deepEqual(item.value1, item.value2); });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
JSON
fast 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):

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Let's dive into the explanation.

**Benchmark Definition and Test Cases**

The benchmark is designed to compare two approaches for checking if two values are equal: using `JSON.stringify()` and using the `fast-equals` library.

**Fast-Equals Library**

The `fast-equals` library is a JavaScript implementation of the equality testing algorithm. It's used to check if two values are equal, ignoring various nuances like:

* Null vs undefined
* NaN (Not a Number) vs NaN
* Symbol vs string or number
* Array and object comparison

The library provides several methods for checking equality, including `deepEqual` and `strictEqual`. In this benchmark, the `deepEqual` method is used.

**JSON.stringify()**

`JSON.stringify()` is a built-in JavaScript function that converts a value into a JSON string. When comparing two values using `JSON.stringify()`, it's essential to consider that:

* Null vs undefined: `JSON.stringify(null)` returns `"null"`, while `JSON.stringify(undefined)` returns `""`.
* NaN (Not a Number) vs NaN: `JSON.stringify(NaN)` returns `"NaN"`.
* Symbol vs string or number: `JSON.stringify(symbol)` returns the symbol as a string.
* Array and object comparison: `JSON.stringify(array)` returns an array of strings, while `JSON.stringify(object)` returns an object with key-value pairs.

**Options Compared**

The benchmark compares two approaches:

1. **JSON**: Using `JSON.stringify()` to compare values.
2. **fast-equals**: Using the `deepEqual` method from the `fast-equals` library to compare values.

**Pros and Cons of Each Approach**

**JSON:**

Pros:

* Built-in JavaScript function, so no additional dependencies required.
* Easy to understand and implement.

Cons:

* Can be slow for large objects or arrays, as it needs to serialize the entire value.
* May not handle nuances like NaN, null vs undefined, or symbol comparisons correctly.

**fast-equals:**

Pros:

* Optimized for performance, especially when dealing with large values.
* Handles various nuances like NaN, null vs undefined, and symbol comparisons correctly.

Cons:

* Requires additional dependency (the `fast-equals` library).
* May have a steeper learning curve due to its specific implementation.

**Other Considerations**

When choosing between these approaches, consider the following factors:

* Performance: If speed is crucial, use `fast-equals`. Otherwise, `JSON.stringify()` might be sufficient.
* Complexity: If you need to handle edge cases or nuances like NaN or symbol comparisons, `fast-equals` is a better choice.
* Dependency management: Since `fast-equals` requires an additional dependency, consider this when deciding which approach to use.

**Alternatives**

Other alternatives for equality testing include:

1. **Lodash.equals()**: A more comprehensive implementation of the equality testing algorithm, providing various methods for handling edge cases.
2. **JSDiff**: A library specifically designed for comparing and formatting JavaScript code.
3. **Object.is()**: A built-in JavaScript function (available in ECMAScript 2015 and later) that checks if two values are equal or not.

These alternatives offer different trade-offs between performance, complexity, and dependency management.

Related benchmarks:

Fast deep equal vs strigify (version: 0)

Comparing performance of: JSON vs fast equal

Created: 2 years ago by: Guest

Jump to the latest result

JSON

fast 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):