Benchmark: Comparison for Simple Objects

HTML Preparation code:

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

Script Preparation code:

window.foo = {
    teste: '1',
    outro: {
      mais: 4,
    },
  };
window.bar = {
    teste: '1',
    outro: {
      mais: 4,
    },
  };

Tests:

_.isEqual
_.isEqual(window.foo, window.bar)
JSON.stringify
JSON.stringify(window.foo) === JSON.stringify(window.bar);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.isEqual
JSON.stringify

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 JSON for MeasureThat.net and explain what's being tested.

**Benchmark Definition**

The benchmark is testing the performance of two functions:

1. `_.isEqual(window.foo, window.bar)`
2. `JSON.stringify(window.foo) === JSON.stringify(window.bar)`

These two tests are comparing the equality of two objects: `window.foo` and `window.bar`.

**Options Compared**

The comparison is between two approaches to check if two objects are equal:

a. **Lodash's `_.isEqual()` function**: This function is part of the Lodash library, which provides a set of utility functions for functional programming.

b. **JSON string comparison**: The second test uses the fact that in JavaScript, when you convert an object to a JSON string using `JSON.stringify()`, it returns a unique string representation of the object's contents. By comparing these two strings, we can determine if the original objects are equal.

**Pros and Cons**

a. **Lodash's `_isEqual()` function**:
	* Pros: This approach is likely to be more accurate because it checks for deep equality between objects, including nested properties.
	* Cons: Using a third-party library like Lodash may introduce additional overhead due to the library's initialization, parsing, and evaluation time.

b. **JSON string comparison**:
	* Pros: This approach is lightweight and doesn't require any external libraries or dependencies.
	* Cons: It may not be as accurate as using `_isEqual()` because it only checks for equality of object properties' values, without considering their types or structure.

**Other Considerations**

* The benchmark uses two similar objects (`window.foo` and `window.bar`) with nested properties (`teste` and `outro.mais`). This might lead to different results between the two tests if the objects have different property names, even if their values are equal.
* Using JSON string comparison may not be suitable for all cases, such as when working with large objects or complex data structures.

**Library Used**

Lodash is a popular JavaScript library that provides a set of utility functions for functional programming. In this case, the `_isEqual()` function is used to compare the equality of two objects.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntaxes mentioned in this benchmark.

Now, regarding other alternatives:

* For comparing object equality, you could use `===` operator, which checks for both value and type equality.
* You could also use a custom implementation, such as recursively iterating over the properties of each object to check for deep equality.

Keep in mind that using a third-party library like Lodash may not always be the best approach. In this case, the JSON string comparison works well because the objects have similar structures and values. However, if you need more advanced features or customization options, using a library like Lodash might be a better choice.

Related benchmarks:

Comparison for Simple Objects (version: 0)

Test on isEqual performance

Comparing performance of: _.isEqual vs JSON.stringify

Created: 3 years ago by: Guest

Jump to the latest result

_.isEqual

JSON.stringify

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):