Benchmark: Date toISOString

Tests:

1
const updated = new Date().toISOString()
2
const updated = new Date(Date.now()).toISOString();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
2

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36

Browser/OS: Chrome 124 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
1	624620.2 Ops/sec
2	554512.2 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its test cases to understand what's being measured.

**Benchmark Definition**

The provided JSON represents a basic benchmark definition, which includes:

* `Name`: The name of the benchmark, "Date toISOString".
* `Description` and `Script Preparation Code`, `Html Preparation Code`: These fields are empty, indicating that no specific description or setup code is required for this benchmark.

**Individual Test Cases**

The test cases define two different scenarios to measure:

1. `const updated = new Date().toISOString()`: This test case creates a new `Date` object using the current time and converts it to an ISO string format.
2. `const updated = new Date(Date.now()).toISOString();`: This test case creates a new `Date` object by passing the result of `Date.now()` (which returns the number of milliseconds since the Unix epoch) as an argument, and then converts it to an ISO string format.

**What's being tested**

In both cases, the benchmark is measuring the performance of converting a `Date` object to an ISO string. The main difference between the two test cases lies in how the `Date` object is created:

* Test case 1 uses `new Date()`, which creates a new `Date` object based on the current system time.
* Test case 2 uses `new Date(Date.now())`, which creates a new `Date` object using the result of `Date.now()` as its timestamp.

**Comparison options**

The benchmark is comparing two approaches:

1. Using `new Date()` to create a `Date` object based on the current system time.
2. Using `new Date(Date.now())` to create a `Date` object with a specific timestamp.

**Pros and Cons**

* **Using `new Date()`**:
	+ Pros: Simpler code, less overhead required for timestamp creation.
	+ Cons: May result in different performance characteristics compared to using `Date.now()`, as the system time can vary between runs.
* **Using `new Date(Date.now())`**:
	+ Pros: More accurate control over the timestamp used for the `Date` object, potentially leading to more consistent results.
	+ Cons: Requires passing an additional argument (`Date.now()`), which might add minor overhead.

**Library usage**

There is no explicit library mentioned in the benchmark definition or test cases. However, it's likely that the JavaScript engine (e.g., V8 in Chrome) provides the built-in `Date` and `Date.now()` functions used in the test cases.

**Special JS features or syntax**

None of the test cases explicitly use any special JavaScript features or syntax beyond what's required for creating a `Date` object.

Related benchmarks:

Date toISOString (version: 0)

Comparing performance of: 1 vs 2

Created: 2 years ago by: Guest

Jump to the latest result

1

2

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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