Benchmark: Test Loop Set Data2

Script Preparation code:

var arr = new Array(15000);
arr.fill({ id: 0, text: "test" });
arr = arr.map((el, idx) => el.id = idx);
var foo = Math.floor(Math.random() * 15000);

Tests:

1
const index = arr.findIndex((itm) => itm.id === foo); const newArr = [...arr]; arr[index] = {...arr[index], text: "edittest"}
2
const newArr = arr.map((row, index) => { if (index === 1) { return { ...arr[0], text: "edittest" } } })

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: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:126.0) Gecko/20100101 Firefox/126.0

Browser/OS: Firefox 126 on Windows

View result in a separate tab

Test name	Executions per second
1	6788.7 Ops/sec
2	9708.7 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark definition and test cases to explain what's being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark is defined by a JSON object that provides configuration for the test. The key aspects of this definition are:

1. **Script Preparation Code**: This code initializes an array `arr` with 15,000 elements, fills each element with an object containing `id` and `text` properties, and sets the `id` property of each element to its index.
2. **Html Preparation Code**: There is no HTML preparation code provided, which means that any browser-specific rendering or layout considerations are not being tested.

**Individual Test Cases**

There are two test cases defined:

1. **Test Case 1**:
	* **Benchmark Definition**: This script finds the index of an element in `arr` using `findIndex`, creates a new array `newArr` by copying `arr`, and then updates the element at that index with a new object containing the same properties as before, but with a modified `text` property.
	* **Purpose**: This test case is likely checking the performance of finding an element in an array using `findIndex`.
2. **Test Case 2**:
	* **Benchmark Definition**: This script maps over `arr` and creates a new array `newArr`. It uses a conditional statement to return a modified version of the first element (`arr[0]`) with a different `text` property.
	* **Purpose**: This test case is likely checking the performance of mapping an array using `map`.

**Library Usage**

There is no explicit library usage mentioned in the benchmark definition. However, it's worth noting that some JavaScript implementations may have internal libraries or optimizations that could affect the results.

**Special JS Feature or Syntax**

There are a few special features and syntaxes used in these test cases:

* **FindIndex**: The `findIndex` method is used to find the index of an element in `arr`. This method is part of the ECMAScript standard, but it may have different implementations across browsers.
* **Map**: The `map` function is used to create a new array by applying a transformation function to each element. This function is also part of the ECMAScript standard.

**Pros and Cons**

The pros and cons of these approaches are:

1. **FindIndex (Test Case 1)**:
	* Pros: Fast lookup times, concise syntax.
	* Cons: May not be supported in older browsers or implementations with limited JavaScript engines.
2. **Map (Test Case 2)**:
	* Pros: Flexible transformation functions, can handle complex data transformations.
	* Cons: Can be slower than `findIndex` for simple lookups, may incur additional overhead due to function creation and execution.

**Other Alternatives**

For similar use cases, consider the following alternatives:

1. **For loops**: Using a traditional `for` loop to iterate over the array could provide comparable performance to `map`, but would require more boilerplate code.
2. **Array.prototype.indexOf()**: This method can be used as an alternative to `findIndex`, but it's not supported in older browsers and has some differences in behavior compared to `findIndex`.

Keep in mind that these alternatives may not be directly comparable due to differences in implementation and performance characteristics.

In summary, the provided benchmark definition is testing the performance of two common JavaScript operations: finding an element in an array using `findIndex` versus mapping over an array using `map`. The pros and cons of each approach are discussed above, highlighting their respective advantages and disadvantages.

Related benchmarks:

Test Loop Set Data2 (version: 0)

Comparing performance of: 1 vs 2

Created: one year 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):