Benchmark: _.isEqual vs ===

HTML Preparation code:

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

Script Preparation code:

// 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:

_.isEqual Level 3
_.isEqual(window.foo3, window.bar3)
=== level 3
window.foo3 === window.bar3

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.isEqual Level 3
=== level 3

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what's being tested.

**Benchmark Definition**

The benchmark defines two test cases:

1. `_.isEqual(window.foo3, window.bar3)`: This test case uses the Lodash library to compare the equality of two objects: `window.foo3` and `window.bar3`. The test is checking if these objects are equal according to the `_isEqual` function from Lodash.
2. `window.foo3 === window.bar3`: This test case directly compares the equality of two objects using the `===` operator.

**Options Compared**

These two test cases are comparing the performance of:

* Direct object comparison (`window.foo3 === window.bar3`)
* Using a library's built-in equality function (`_.isEqual(window.foo3, window.bar3)`)

**Pros and Cons**

1. **Direct Object Comparison**
	* Pros: Simple and straightforward.
	* Cons:
		+ May not work correctly for nested objects or arrays.
		+ Can be slower than using a library's optimized equality function.
2. **Lodash's `_isEqual` Function**
	* Pros:
		+ Handles nested objects, arrays, and other edge cases.
		+ Optimized for performance.
	* Cons:
		+ Requires including an external library (Lodash).
		+ May have additional overhead due to the library.

**Other Considerations**

When using a library like Lodash for equality checks, it's essential to consider:

* Additional dependencies: Incluing an external library may add complexity to your project.
* Library versioning: Keep in mind that different versions of Lodash might behave differently or have performance optimizations.

If you prefer not to use an external library, you can implement a simple equality function yourself. However, this will require handling edge cases and optimizing for performance.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax used in these test cases. The focus is on comparing the performance of direct object comparison versus using a library's optimized equality function.

**Other Alternatives**

If you don't want to use Lodash, you can implement your own equality function, such as:

```javascript
function isEqual(a, b) {
  if (typeof a !== typeof b) return false;
  // Handle nested objects and arrays here
}
```

Alternatively, you can use other libraries or built-in functions that provide optimized equality checks, like `JSON.stringify` and `JSON.parse`, for simple object comparisons. However, these might not be as efficient as using Lodash's `_isEqual` function.

Related benchmarks:

_.isEqual vs === (version: 0)

_.isEqual vs ===

Comparing performance of: _.isEqual Level 3 vs === level 3

Created: 6 years ago by: Guest

Jump to the latest result

_.isEqual Level 3

=== level 3

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):