Benchmark: new-date-vs-date-settime-fixed

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 = now; 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()	4378.9 Ops/sec
setTime()	0.0 Ops/sec
BASE	16963.7 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into explaining the benchmark.

**What is being tested?**

The provided JSON represents a JavaScript microbenchmark that measures the performance of three different approaches to create and manipulate Date objects:

1. Creating a new Date object using `new Date()`
2. Setting the time of an existing Date object using `setTime()`
3. Directly assigning a timestamp value to a variable without creating a Date object (`BASE`)

**Options compared:**

* **new Date()**: Creates a new Date object and sets its time property.
* **setTime()**: Sets the time property of an existing Date object.
* **BASE**: Does not create or manipulate Date objects, instead directly assigning a timestamp value to a variable.

**Pros and Cons of each approach:**

1. **new Date()**:
	* Pros: Simple and efficient way to create a new Date object, especially when working with JavaScript's built-in functionality.
	* Cons: Can be slower than other approaches since it involves creating a new object instance.
2. **setTime()**:
	* Pros: Fastest approach among the three, as it only updates an existing Date object without creating a new one.
	* Cons: Requires an existing Date object to work with, which might not always be available or convenient to obtain.
3. **BASE**:
	* Pros: Does not create any objects, making it potentially faster and more efficient than the other approaches.
	* Cons: Directly assigns a timestamp value to a variable, which can lead to unexpected behavior if the variable is used in a way that assumes it's a Date object.

**Library usage:**

None of the provided benchmark definitions use any external libraries. However, note that `Date` and `Math` are built-in JavaScript objects.

**Special JS feature or syntax:**

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

Related benchmarks:

new-date-vs-date-settime-fixed (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):