Benchmark: delete vs _.unset

HTML Preparation code:

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

Script Preparation code:

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

Tests:

_.unset
_.unset(obj, 'a'); _.unset(obj, 'b'); _.unset(obj, 'c');
delete
delete obj.a; delete obj.b; delete obj.c;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.unset
delete

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36

Browser/OS: Chrome 115 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
_.unset	1257512.8 Ops/sec
delete	4722800.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared options, pros and cons of each approach, and other considerations.

**Benchmark Definition**

The benchmark is designed to compare two approaches for removing properties from an object in JavaScript: `_.unset` (using Lodash) and `delete`.

**Options Compared**

Two options are being compared:

1. **_.unset**: Using the `_.unset` function from the Lodash library, which is a utility function that removes a property from an object.
2. **delete**: Using the built-in `delete` operator in JavaScript to remove properties from an object.

**Pros and Cons of Each Approach**

**_.unset (using Lodash)**

Pros:

* More concise and expressive code
* Less chance of typos or syntax errors due to its higher-level abstraction
* Easier to use for more complex removal scenarios

Cons:

* Requires including the Lodash library, which may add unnecessary overhead
* May be slower than `delete` due to the added indirection (calling a function)

**delete**

Pros:

* Built-in and native JavaScript, so no additional dependencies or overhead
* Faster execution time compared to _.unset due to reduced overhead

Cons:

* More verbose code required for removal of multiple properties
* Greater chance of typos or syntax errors due to its lower-level abstraction

**Other Considerations**

* When using `delete`, it's essential to ensure that the object being modified is not referenced elsewhere in the code, as this can lead to unexpected behavior.
* Lodash's `_.unset` function also provides additional benefits, such as handling edge cases like properties with numeric values or non- enumerable properties.

**Library: Lodash**

Lodash (formerly known as underscore.js) is a popular JavaScript utility library that provides a wide range of functions for tasks like array manipulation, string processing, and object modification. In this benchmark, the `_.unset` function is used to remove properties from an object.

**Special JS Feature/Syntax**

None are explicitly mentioned in the provided benchmark definition or test cases. However, it's worth noting that JavaScript has several features and syntax elements that can impact performance, such as:

* Closures
* Hoisting
* Early returns
* Async/await
* etc.

These factors may influence the execution time of individual test cases, but they are not explicitly mentioned in this benchmark.

**Alternatives**

If you're interested in exploring alternative approaches or libraries for property removal, here are a few options:

* Using `Object.keys()` and `forEach()` to remove properties: This approach involves iterating over an array of keys and using the `delete` operator on each key.
* Using `Object.assign()` with the spread operator (`...`) to create a new object without specific properties: This approach creates a new object that excludes certain properties, rather than modifying the original object.

Keep in mind that these alternatives may have different performance characteristics or code readability compared to the _.unset function.

Related benchmarks:

delete vs _.unset (version: 0)

For Josh to consider _.unset over JS delete

Comparing performance of: _.unset vs delete

Created: 2 years 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 2 months ago):