Benchmark: lodash unset vs lodash omit

HTML Preparation code:

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

Script Preparation code:

var o = {a:1,b:2,c:3,d:4}

Tests:

_.unset
_.unset(o, 'a') _.unset(o, 'b')
delete
o = _.omit(o, ['a']) o = _.omit(o, ['b'])

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.unset
delete

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):

LLMs can make mistakes. Check important info.

Let's break down what's being tested on the provided JSON and explain the differences between the two approaches.

**Benchmark Definition**

The benchmark is comparing two JavaScript functions: `_.unset` from Lodash and the built-in `delete` operator.

**Lodash _.unset**

* The `_unset` function is part of the Lodash library, which provides a set of utility functions for functional programming.
* The purpose of this function is to remove or "unset" a key-value pair from an object.
* In this benchmark, we're testing how fast `_.unset` is compared to the built-in `delete` operator.

**Built-in delete operator**

* The built-in `delete` operator is used to remove or delete a property (key-value pair) from an object.
* This approach uses the underlying JavaScript engine's mechanism for removing properties, which can be different from Lodash's implementation.

**Options Compared**

The two options being compared are:

1. `_.unset` (Lodash): uses Lodash's internal implementation to remove key-value pairs from objects.
2. `delete` (built-in operator): uses the underlying JavaScript engine's mechanism for removing properties.

**Pros and Cons**

* **_.unset (Lodash)**:
	+ Pros: likely to be implemented in a more efficient way, as it's part of a popular library with performance optimization.
	+ Cons: may introduce additional overhead due to the library's abstraction layer.
* **delete (built-in operator)**:
	+ Pros: can potentially be optimized by the underlying JavaScript engine, reducing overhead.
	+ Cons: its implementation might vary across different browsers and engines.

**Other Considerations**

In addition to these two options, other approaches could be considered:

1. Using the `Object.keys()` method to iterate over the object's keys and then using `delete` on each key individually.
2. Using a library like underscore.js or other polyfills for Lodash's implementation.
3. Implementing custom logic for removing properties from objects.

**Library and Its Purpose**

The library being used here is Lodash, which provides a set of utility functions for functional programming in JavaScript. Lodash helps simplify common tasks, making code more concise and readable.

**Special JS Feature or Syntax**

There's no special JavaScript feature or syntax being tested in this benchmark; it's purely focused on comparing the performance of two different approaches to removing key-value pairs from objects.

Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
_.unset	4664112.0 Ops/sec
delete	1218211.2 Ops/sec

Related benchmarks:

lodash unset vs lodash omit (version: 0)

Comparing performance of: _.unset vs delete

Created: 10 months ago by: Guest

Jump to the latest result

_.unset

delete

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):