Benchmark: new-date-vs-date-settime-0

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 = 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:

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

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

**Benchmark Overview**

The benchmark measures the performance of creating and manipulating `Date` objects in JavaScript. The test consists of three cases:

1. `new Date()`: Creates a new `Date` object using the constructor.
2. `setTime()`: Sets the time value of an existing `Date` object using the `setTime()` method.
3. `BASE`: A baseline test that creates and manipulates an array of numbers without creating any `Date` objects.

**Library and Features**

The benchmark uses the built-in JavaScript `Date` object, which is a native feature. No external libraries are required.

There are no special JS features or syntax used in this benchmark, so we can move on to the next section.

**Benchmark Preparation Code**

The preparation code for each test case is provided as part of the benchmark definition:

* For `new Date()`, an array `nums` is created with 1000 elements, each representing a different time value. The script then loops through this array and creates a new `Date` object for each element.
* For `setTime()`, an existing `Date` object `DATE` is set up in the preparation code, and then the loop iterates over the same array of numbers to set the time value using the `setTime()` method.

**Comparison of Approaches**

The three test cases compare the performance of:

1. Creating a new `Date` object (`new Date()`)
2. Setting the time value of an existing `Date` object using the `setTime()` method (`setTime()`)
3. A baseline test that creates and manipulates an array of numbers without creating any `Date` objects (`BASE`)

**Pros/Cons of Each Approach**

1. **new Date()**: This approach is simple and straightforward, but may incur overhead due to object creation and garbage collection.
	* Pros: Easy to implement, minimal dependencies
	* Cons: Potential performance overhead
2. **setTime()**: This approach avoids the potential overhead of creating a new `Date` object, as it uses an existing object.
	* Pros: Avoids object creation overhead, can be faster
	* Cons: Requires an existing `Date` object to be set up in advance
3. **BASE**: This baseline test serves as a reference point for the other two tests and provides a clean slate for comparison.
	* Pros: Baseline test, easy to understand
	* Cons: Does not directly compare the performance of creating or manipulating `Date` objects

**Other Alternatives**

If you wanted to modify this benchmark to explore different approaches, here are some alternative test cases you could consider:

1. Using a library like Lodash's `lodash.date.js` to create and manipulate dates.
2. Comparing the performance of using `Date.now()` vs. `new Date().getTime()`
3. Adding more complex date calculations or operations (e.g., formatting, parsing) to the test cases.

Keep in mind that these alternatives would require significant changes to the benchmark definition and preparation code.

Related benchmarks:

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

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

Created: 7 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

No previous run results

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