Benchmark: delete vs omit - MeasureThat.net

HTML Preparation code:

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

Script Preparation code:

var a = {
  b: 1,
  c: 2
}

Tests:

omit
_.pick(a, ['b'])
delete
delete a.c

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
omit
delete

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 23 days ago):

LLMs can make mistakes. Check important info.

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

**Benchmark Definition:**

The website `MeasureThat.net` provides a JavaScript microbenchmarking tool that allows users to create and run benchmarks. The provided JSON defines two benchmark definitions:

1. "delete vs omit"
2. Two individual test cases:
	* "_.pick(a, ['b'])" (using the Lodash library)
	* "delete a.c"

**What's being tested:**

The benchmark compares the performance of two approaches for deleting properties from an object:

1. **Omitting**: Using the `_` function from Lodash to remove specific keys from the `a` object.
2. **Delete**: Directly using the `delete` keyword to delete properties from the `a` object.

**Options compared:**

The benchmark is comparing two approaches with different syntax and performance implications:

1. Omitting (using `_pick(a, ['b'])`): This method uses a library function to remove specific keys from the object.
2. Delete (`delete a.c`): This method uses the `delete` keyword to directly delete properties from the object.

**Pros and Cons of each approach:**

1. Omitting (Lodash):
	* Pros:
		+ More concise syntax
		+ Less error-prone, as it's a library function that handles edge cases
		+ Can be more efficient for large objects, since it doesn't require manual iteration
	* Cons:
		+ Requires an additional library to be loaded (Lodash)
		+ May have slower startup times due to the extra dependency
2. Delete (`delete` keyword):
	* Pros:
		+ Faster execution time, as it's a native JavaScript operation
		+ Less overhead compared to using a library function
	* Cons:
		+ More error-prone, as manual iteration or off-by-one errors can occur
		+ May not handle edge cases correctly (e.g., deleting multiple properties)

**Lodash Library:**

The `_.pick` function from Lodash is used in the "omit" benchmark definition. Lodash is a popular JavaScript library that provides utility functions for functional programming, data manipulation, and more. In this case, `_pick` is used to create a new object with only specific keys included.

**Special JS feature:**

There are no special JavaScript features or syntax mentioned in this benchmark.

**Other alternatives:**

If you prefer not to use the `delete` keyword or Lodash library, there are alternative approaches:

1. Manual iteration using `Object.keys()` and `Object.prototype.hasOwnProperty.call()`
2. Using a custom implementation of the `_pick` function

Keep in mind that these alternatives may have different performance characteristics compared to the benchmarked approaches.

Let me know if you'd like me to elaborate on any of these points!

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser/OS: Chrome 128 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
omit	5944311.5 Ops/sec
delete	33986504.0 Ops/sec

Related benchmarks:

delete vs omit (version: 0)

Comparing performance of: omit vs delete

Created: 6 years ago by: Guest

Jump to the latest result

omit

delete

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 23 days ago):