Benchmark: toISOString and literalISO

Script Preparation code:

var date = new Date();

function toISOString(date) {
	return date.toISOString();
}

function literal(date) {
 	var d = date.getUTCDate();
	var m = date.getUTCMonth() + 1;
	var y = date.getUTCFullYear();
  	var hh = date.getUTCHours();
 	var mm = date.getUTCMinutes();
  	var ss = date.getUTCSeconds();
  	var ms = date.getUTCMilliseconds();
  	var day = d <= 9 ? '0' + d : '' + d;
    var month = m <= 9 ? '0' + m : '' + m;
    var year = '' + y;
  
  	hh = hh <= 9 ? '0' + hh : '' + hh;
    mm = mm <= 9 ? '0' + mm : '' + mm;
    ss = ss <= 9 ? '0' + ss : '' + ss;
    ms = ms <= 9 ? '0' + ms : '' + ms;
    ms = ms <= 99 ? '0' + ms : '' + ms;
  
	return `${year}-${month}-${day}T${hh}:${mm}:${ss}.${ms}Z`;
}

function concat(date) {
 	var d = date.getUTCDate();
	var m = date.getUTCMonth() + 1;
	var y = date.getUTCFullYear();
  	var hh = date.getUTCHours();
 	var mm = date.getUTCMinutes();
  	var ss = date.getUTCSeconds();
  	var ms = date.getUTCMilliseconds();
  	var day = d <= 9 ? '0' + d : '' + d;
    var month = m <= 9 ? '0' + m : '' + m;
    var year = '' + y;
  
  	hh = hh <= 9 ? '0' + hh : '' + hh;
    mm = mm <= 9 ? '0' + mm : '' + mm;
    ss = ss <= 9 ? '0' + ss : '' + ss;
    ms = ms <= 9 ? '0' + ms : '' + ms;
    ms = ms <= 99 ? '0' + ms : '' + ms;
  
	return year + '-' + month + '-' + day + 'T' + hh + ':' + mm + ':' + ss + '.' + ms + 'Z';
}

Tests:

toISOString
for (var i=0; i<1000; ++i) { toISOString(date); }
concat
for (var i=0; i<1000; ++i) { concat(date); }
literal
for (var i=0; i<1000; ++i) { literal(date); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
toISOString
concat
literal

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its options.

**Benchmark Definition JSON**

The benchmark definition contains two functions: `toISOString` and `concat`. Both functions take a `date` object as an input and return a string representation of the date in ISO format.

1. **Function Purpose**: The purpose of these functions is to test how JavaScript engines optimize the creation of strings from date objects.
2. **Purpose of Comparison**: By comparing the execution time of these two functions, the benchmark aims to determine which approach is more efficient.

**Options Compared**

Two options are compared:

1. **toISOString**: This function returns a string in ISO format by using the `toISOString()` method provided by the JavaScript `Date` object.
2. **concat**: This function returns a string in ISO format by manually concatenating the date components (year, month, day, hours, minutes, seconds, and milliseconds) using template literals.

**Pros and Cons**

1. **toISOString**:
	* Pros: The `toISOString()` method is a built-in method provided by JavaScript engines, so it's likely to be optimized for performance.
	* Cons: This approach may not provide the most detailed control over the output string format.
2. **concat**:
	* Pros: This approach allows for more control over the output string format and can potentially generate more human-readable dates.
	* Cons: Manually concatenating date components using template literals may be slower than using a built-in method like `toISOString()`.

**Library and Special JS Features**

In this benchmark, no libraries are used, and there is no mention of special JavaScript features or syntax. The benchmark focuses on the execution time comparison between two simple functions.

**Alternatives**

Other alternatives to measure execution time comparisons include:

* Using a profiling tool like V8 Profiler (for Chrome) or Firefox's Profiler
* Utilizing frameworks like Benchmark.js, which provides a more comprehensive set of features for measuring performance

When preparing benchmarks, it's essential to consider the following best practices:

* Keep the benchmark code simple and focused on the specific aspect being measured.
* Use a consistent naming convention and organization for the benchmark code.
* Provide clear instructions and expectations for the benchmark execution.
* Ensure that the benchmark is representative of real-world usage scenarios.

By understanding these concepts, you can create effective benchmarks like MeasureThat.net to help optimize performance in JavaScript applications.

Related benchmarks:

toISOString and literalISO (version: 0)

Comparing performance of: toISOString vs concat vs literal

Created: 4 years ago by: Guest

Jump to the latest result

toISOString

concat

literal

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):