Benchmark: Lodash omit vs delete in b

HTML Preparation code:

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

Tests:

Delete in a
let a = { "name": "john doe", "isNew": true }; delete a["isNew"];
Lodash omit in a
let a = { "name": "john doe", "isNew": true }; _.omit(a, "isNew");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Delete in a
Lodash omit in a

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_5_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 17 on iOS 17.5.1

View result in a separate tab

Test name	Executions per second
Delete in a	454314880.0 Ops/sec
Lodash omit in a	3066971.8 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The benchmark measures the performance of two approaches: deleting a property from an object using the `delete` keyword, versus removing that same property from the object using the `_omit` function from Lodash (a popular JavaScript utility library).

**Options Compared**

There are two options being compared:

1. **Delete**: This approach uses the `delete` keyword to remove the specified property (`"isNew"`). The syntax is: `delete a[\"isNew\"];`.
2. **Lodash _omit_**: This approach uses Lodash's `_omit` function to remove the specified property from the object. The syntax is: `_.omit(a, "isNew");`.

**Pros and Cons**

* **Delete**:
	+ Pros: Simple and concise syntax.
	+ Cons: May not be as efficient or reliable, especially in complex objects with nested properties.
* **Lodash _omit_**:
	+ Pros: More flexible and powerful, allowing for easier manipulation of object properties. Lodash also provides other useful functions for working with objects.
	+ Cons: Requires importing an additional library (Lodash), which may add overhead.

**Other Considerations**

When deleting a property from an object using the `delete` keyword, it's essential to be aware that this approach does not actually delete the property, but rather sets its value to `undefined`. This can lead to unexpected behavior if other parts of the code rely on the property being present.

In contrast, Lodash's `_omit_` function returns a new object with the specified property removed, without modifying the original object. This makes it a more predictable and safer approach in many cases.

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides a wide range of functions for working with arrays, objects, strings, numbers, and other data types. The `_omit` function is just one example of Lodash's extensive feature set.

**Special JS Feature or Syntax (None in this case)**

There are no special JavaScript features or syntax used in this benchmark that would require explanation or discussion.

**Alternatives**

If you don't want to use a third-party library like Lodash, you could consider using other alternatives for removing properties from objects, such as:

* Using the `for...in` loop to iterate over object properties and manually deleting them.
* Implementing your own function for removing properties, similar to what Lodash's `_omit_` function does.

However, these alternatives may not be as efficient or convenient as using a library like Lodash.

Related benchmarks:

Lodash omit vs delete in b (version: 0)

Comparing performance of: Delete in a vs Lodash omit in a

Created: one year ago by: Guest

Jump to the latest result

Delete in a

Lodash omit in a

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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