Benchmark: Manipulate String x Number

Script Preparation code:

window.now = new Date();

Tests:

String
const nowString = window.now.toISOString().substring(0, 10);
Number
const nowNumber = Math.floor(window.now.getTime() / 86400000) * 86400000;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
String
Number

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its test cases.

**What is being tested?**

The provided benchmark tests two different approaches to manipulate numbers:

1. **`window.now.toISOString().substring(0, 10)`**: This method extracts the first 10 characters from the timestamp returned by `window.now`. It's a way to extract only the date part of a Unix timestamp.
2. **`Math.floor(window.now.getTime() / 86400000) * 86400000`**: This formula calculates the equivalent number of seconds since January 1, 1970 (Unix epoch). It's used to convert a Unix timestamp into a standard seconds value.

**Options being compared**

The benchmark compares the performance of these two approaches:

* Approach 1: Using `window.now.toISOString().substring(0, 10)`
* Approach 2: Using `Math.floor(window.now.getTime() / 86400000) * 86400000`

**Pros and Cons of each approach**

Approach 1 (`window.now.toISOString().substring(0, 10)`):

Pros:

* More intuitive and human-readable
* Often faster due to the optimized string manipulation

Cons:

* Requires an additional `toISOString()` call, which may incur extra overhead
* May require additional processing power for string slicing

Approach 2 (`Math.floor(window.now.getTime() / 86400000) * 86400000`):

Pros:

* More mathematically efficient and direct
* Can be faster due to the optimized arithmetic operations

Cons:

* Less intuitive and may not be as readable
* May require more processing power for date arithmetic

**Library and purpose**

There is no explicit library mentioned in the benchmark. However, `window.now` likely refers to a global variable that represents the current timestamp.

**Special JS feature or syntax**

The benchmark uses JavaScript features such as:

* `const` declaration (for variable binding)
* `Math.floor()` and `Math.round()` functions (for arithmetic operations)
* String slicing (`substring()`)
* Date arithmetic (`getTime()`, `/`, `*`, and `%`)

These features are standard in modern JavaScript, but may be less familiar to developers without a strong background in the language.

**Other alternatives**

If these approaches don't meet performance requirements or have specific use cases, alternative methods could include:

* Using a dedicated date library like Moment.js or Luxon for more accurate and efficient date manipulation.
* Utilizing browser-specific APIs, such as `Date.now()` (supported by most browsers) or `Performance.now()` (for high-precision timing).
* Implementing custom date arithmetic using bitwise operations or other optimized algorithms.

Keep in mind that the choice of approach ultimately depends on the specific use case and performance requirements.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.72 Safari/537.36

Browser/OS: Chrome 90 on Linux

View result in a separate tab

Test name	Executions per second
String	2141343.2 Ops/sec
Number	4091619.5 Ops/sec

Related benchmarks:

Manipulate String x Number (version: 0)

Comparing performance of: String vs Number

Created: 3 years ago by: Guest

Jump to the latest result

String

Number

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):