Benchmark: Create Date - MeasureThat.net

Script Preparation code:

var start = new Date();
var temp1 = new Date();

Tests:

New
var new1 = ((new Date(start)).setHours(0,0,0,0)).getTime();
Reuse
temp1.setTime(start); temp1.setHours(0,0,0,0); var new1 = temp1.getTime();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
New
Reuse

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

**Benchmark Explanation**

The provided benchmark tests two different approaches to create a date object and measure its time.

**Approach 1: Creating a new Date object directly**
```javascript
var start = new Date();
var temp1 = new Date(start);
```
This approach creates a new `Date` object by calling the constructor with no arguments, which returns the current timestamp. The `start` variable is then assigned this value.

**Approach 2: Reusing an existing Date object**
```javascript
var start = new Date();
temp1 = start;
temp1.setHours(0,0,0,0);
var new1 = temp1.getTime();
```
This approach creates a new `Date` object called `start`, which is assigned to the `temp1` variable. The `setHours` method is then used to reset the time of `temp1` to midnight (00:00:00). Finally, the `getTime` method is called on `temp1` to get its timestamp, which is assigned to `new1`.

**Comparison**

The benchmark compares the performance of these two approaches:

* **Reuse**: Creating a new `Date` object and reusing it.
* **New**: Creating a new `Date` object directly.

**Pros and Cons**

**Reuse:**

Pros:

* Reuses existing memory, which can be beneficial for systems with limited resources.
* Can be faster since no overhead is added by creating a new object.

Cons:

* May not work correctly if the original timestamp is modified or deleted.
* Requires careful management of the reused object to avoid issues.

**New:**

Pros:

* Easy to understand and implement.
* Does not rely on reusing an existing object, which can be more predictable.

Cons:

* Creates a new `Date` object every time, which can lead to increased memory usage and overhead.

**Other Considerations**

* The benchmark does not account for browser-specific optimizations or quirks that may affect the performance of these approaches.
* It's worth noting that modern browsers often cache `Date` objects in their internal buffers, which can affect how these benchmarks behave. However, this is not explicitly tested here.

**Library and Special JS Features**

None of the provided benchmark code uses any external libraries or special JavaScript features beyond standard ECMAScript functionality.

**Alternatives**

Other approaches to creating dates might include:

* Using `Date.now()` instead of `new Date()`, which returns a high-resolution timestamp directly.
* Creating a custom date object class with optimized methods for measuring time.
* Using a third-party library like Moment.js, which provides additional date-related features and optimizations.

Keep in mind that the choice of approach depends on the specific requirements and constraints of your project.

Related benchmarks:

Create Date (version: 0)

Comparing performance of: New vs Reuse

Created: 9 years ago by: Guest

Jump to the latest result

New

Reuse

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):