Benchmark: moment(string) vs moment(new Date(string)) vs new Date(string)

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.4/moment.min.js'></script>

Tests:

String moment date
const date = moment('22-01-1996')
Date() moment date
const date = moment(new Date('22-01-1996'))
new Date()
const date = new Date('22-01-1996')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
String moment date
Date() moment date
new Date()

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:120.0) Gecko/20100101 Firefox/120.0

Browser/OS: Firefox 120 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
String moment date	460571.0 Ops/sec
Date() moment date	609714.1 Ops/sec
new Date()	8381132.5 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark JSON and explain what's being tested, the options compared, their pros and cons, and other considerations.

**Benchmark Definition**

The benchmark defines three test cases:

1. `String moment date`: Tests the performance of passing a string directly to Moment.js's `moment()` function.
2. `Date() moment date`: Tests the performance of creating a new Date object using the `new Date()` constructor and then passing it to Moment.js's `moment()` function.
3. `new Date()`: Tests the performance of creating a new Date object directly using the `new Date()` constructor.

**Moment.js Library**

The `moment.js` library is used in all three test cases. It provides a powerful date and time manipulation API. In this context, Moment.js is being used to parse a string or create a new Date object, which are then compared for performance differences.

**JavaScript Features and Syntax**

None of the provided benchmark tests use special JavaScript features or syntax beyond what's standard in modern JavaScript. However, it's worth noting that some versions of Moment.js might have deprecated features or specific behavior, but this is not relevant to the current benchmark test.

**Options Compared**

The three options compared are:

1. `String moment date`: Passing a string directly to Moment.js's `moment()` function.
2. `Date() moment date`: Creating a new Date object using the `new Date()` constructor and then passing it to Moment.js's `moment()` function.
3. `new Date()`: Creating a new Date object directly using the `new Date()` constructor.

**Pros and Cons**

Here are some pros and cons of each approach:

1. **String moment date**: Pros:
	* Simplistic and straightforward.
	* Might be optimized for parsing strings by Moment.js.
Cons:
	* May require additional processing or overhead to convert the string to a Date object.
2. **Date() moment date**: Pros:
	* Creates a new Date object, which might be more efficient than passing a string.
	* Provides an intermediate step that can help optimize parsing.
Cons:
	* Introduces an extra constructor call and potential performance impact.
3. **new Date()**: Pros:
	* Creates a new Date object directly without any additional processing.
	* Might be faster since it's a single constructor call.

**Other Considerations**

When comparing these options, consider the following:

* Moment.js is designed to parse date strings, so passing a string might be more efficient if it's a common use case.
* Creating a new Date object using `new Date()` can introduce additional overhead due to the constructor call and potential parsing of internal data structures.
* The test cases only compare the performance of these three options; other factors like memory usage or cache behavior may also vary.

**Alternatives**

If you were to write similar benchmarks, consider testing other approaches, such as:

1. Using a different date library or parser (e.g., Date.js).
2. Implementing custom parsing logic for specific date formats.
3. Comparing the performance of different JavaScript engines (e.g., V8, SpiderMonkey) with Moment.js.

Keep in mind that benchmarking is an art, and results may vary depending on the specific test setup, hardware, and software configurations.

Related benchmarks:

moment(string) vs moment(new Date(string)) vs new Date(string) (version: 1)

Comparing performance of: String moment date vs Date() moment date vs new Date()

Created: one year ago by: Registered User

Jump to the latest result

String moment date

Date() moment date

new Date()

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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