Benchmark: new-date-vs-date-settime-fixed2

Script Preparation code:

var date = new Date();

var now = Date.now();
var nums = [];
for (var i = 0; i < 1000; i++) {
	nums[i] = now + i;
}

Tests:

new Date()
var len = nums.length; var d; for (var i = 0; i < len; i++) { d = new Date(nums[i]); }
setTime()
var len = nums.length; var d = new Date(); for (var i = 0; i < len; i++) { d.setTime(nums[i]); }
BASE
var len = nums.length; var d; for (var i = 0; i < len; i++) { d = nums[i]; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
new Date()
setTime()
BASE

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36

Browser/OS: Chrome 118 on Windows

View result in a separate tab

Test name	Executions per second
new Date()	4301.2 Ops/sec
setTime()	11358.9 Ops/sec
BASE	15153.8 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Overview**

The benchmark you provided tests three approaches to creating and manipulating `Date` objects in JavaScript:

1. `new Date()`
2. `setTime()` with fixed values
3. A baseline "BASE" approach that simply assigns a value to the `Date` object without any additional manipulation

**Options Compared**

The two main options being compared are:

* `new Date()`: creates a new `Date` object using the current date and time
* `setTime()` with fixed values: sets the timestamp of the `Date` object to a specific value using the `setTime()` method

**Pros and Cons**

1. **new Date()**:
	* Pros: simple, straightforward approach that creates a new `Date` object
	* Cons: may not be as efficient as other approaches since it relies on creating a new date object
2. **setTime()` with fixed values**:
	* Pros: can potentially be faster than the `new Date()` approach since it sets the timestamp directly, avoiding the overhead of creating a new date object
	* Cons: requires fixing specific values (in this case, the numbers generated in the script preparation code) which may not always be suitable or meaningful

**BASE Approach**

The "BASE" approach is a baseline test that simply assigns a value to the `Date` object without any additional manipulation. This approach serves as a control group to establish a baseline for comparison with the other two approaches.

Pros:

* Simple and straightforward
* Establishes a baseline for comparison

Cons:

* May not be representative of real-world use cases where dates are often manipulated or created dynamically

**Library: Date**

The `Date` object is a built-in JavaScript object that represents a date and time. It has various methods, including `setTime()`, which allows setting the timestamp of the `Date` object.

In this benchmark, both `new Date()` and `setTime()` are used to create or manipulate `Date` objects, but with different approaches.

**Special JS Feature/ Syntax**

None mentioned in this specific benchmark. However, it's worth noting that JavaScript has various features and syntax related to dates, such as `Date.now()`, `Date.parse()`, and `Intl.DateTimeFormat`. These features are not directly relevant to the current benchmark.

**Alternatives**

Other alternatives for creating or manipulating `Date` objects in JavaScript include:

* Using the `Date` constructor with a fixed timestamp (e.g., `new Date(1234567890000)`)
* Using libraries like Moment.js, Luxon, or DayPilot, which provide more advanced date and time manipulation capabilities
* Utilizing built-in methods like `toISOString()` or `toLocaleString()` to format dates in different ways

These alternatives may offer better performance, feature sets, or usability compared to the options being tested in this benchmark.

Related benchmarks:

new-date-vs-date-settime-fixed2 (version: 0)

Comparing performance of: new Date() vs setTime() vs BASE

Created: 2 years ago by: Guest

Jump to the latest result

new Date()

setTime()

BASE

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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