Benchmark: lodash omit vs spread omit modified

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Tests:

lodash omit
const a = { aa: 'oh', bb: 'my' }; const b = _.omit(a, 'aa');
spread omit
let a = { aa: 'oh', bb: 'my' }; a = {...a, aa: undefined};

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash omit
spread omit

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

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

**What is being tested?**

The benchmark measures the performance difference between two approaches for removing properties from an object in JavaScript:

1. Using the `_.omit` function from the Lodash library.
2. Using the spread operator (`{...obj, prop: undefined}`) to create a new object with the same properties as the original object, but with the specified property set to `undefined`.

**Options compared**

The two approaches are being compared for their performance differences.

Pros and cons of each approach:

1. **_.omit** (Lodash library):
	* Pros:
		+ Convenient and concise syntax.
		+ Well-tested and widely used in the JavaScript community.
	* Cons:
		+ May have additional overhead due to the use of a library.
		+ Not as intuitive as other approaches.
2. **Spread operator (`{...obj, prop: undefined}`)**:
	* Pros:
		+ Native JavaScript syntax, so no external dependencies are required.
		+ Fast and efficient, as it only creates a new object reference.
		+ Easy to understand and implement.
	* Cons:
		+ May be less convenient than the `_.omit` function for some users.

**Library: Lodash**

Lodash is a popular JavaScript library that provides various utility functions for tasks like array manipulation, object processing, and more. The `_omit` function is part of this library and returns a new object with the specified properties removed from the original object.

**Special JS feature or syntax**

This benchmark does not use any special JavaScript features or syntax beyond what's commonly used in modern JavaScript development (e.g., ES6+ syntax).

**Other alternatives**

If you want to remove properties from an object without using the Lodash library, you could also consider:

1. Using `Object.keys()` and `reduce()` methods to create a new object with only the desired keys.
```javascript
const obj = { aa: 'oh', bb: 'my' };
const newObj = Object.keys(obj).reduce((acc, key) => {
  if (key !== 'aa') acc[key] = obj[key];
  return acc;
}, {});
```
2. Using a library like `lodash` as an alternative to the spread operator approach.

Keep in mind that these alternatives might have different performance characteristics compared to the Lodash library or the spread operator approach.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:105.0) Gecko/20100101 Firefox/105.0

Browser/OS: Firefox 105 on Linux

View result in a separate tab

Test name	Executions per second
lodash omit	744297.3 Ops/sec
spread omit	12640190.0 Ops/sec

Related benchmarks:

lodash omit vs spread omit modified (version: 0)

Comparing performance of: lodash omit vs spread omit

Created: 2 years ago by: Guest

Jump to the latest result

lodash omit

spread omit

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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