Benchmark: lasdkjgflkhwu egcwjxer1231232

Script Preparation code:

var list = Array.from(new Array(10000), (x,i) => [i,i]);

Tests:

1
const obj = {}; for (const item of list) { obj[item[0]] = item[1]; }
2
const obj = Object.fromEntries(list);

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 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/25.0 Chrome/121.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 121 on Android

View result in a separate tab

Test name	Executions per second
1	5004.0 Ops/sec
2	803.5 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 provided JSON and explain what's being tested.

**Benchmark Definition**

The benchmark definition is a JSON object that represents a JavaScript microbenchmark. It contains two essential pieces of information:

1. **Script Preparation Code**: This code is executed once, before running the actual benchmark. In this case, it creates an array `list` with 10,000 elements, where each element is an array `[index, value]`. The script preparation code ensures that the list is populated with consistent data for both test cases.
2. **Html Preparation Code**: This field is empty in this example, which means no HTML-specific setup or initialization is required.

**Individual Test Cases**

The benchmark definition references two separate test cases, each represented by a JSON object:

1. **Test Case 1**: The script execution code uses a `for...of` loop to iterate over the `list` array and populate an object `obj` with the indices and values.
2. **Test Case 2**: This test case uses the `Object.fromEntries()` method to create an object from the `list` array, where each element is a key-value pair.

**Comparison of Approaches**

The two approaches differ in how they iterate over the `list` array:

1. **Test Case 1 (for...of loop)**: This approach uses a traditional `for...of` loop to iterate over the array elements. The loop iterates over each element, assigning it to the variable `item`, and then uses `item[0]` as the key and `item[1]` as the value in the object `obj`.
2. **Test Case 2 (Object.fromEntries())**: This approach uses the `Object.fromEntries()` method to create an object from the array elements. The `list` array is passed directly to this function, which returns a new object with the indices and values as key-value pairs.

**Pros and Cons of Each Approach**

1. **Test Case 1 (for...of loop)**:
	* Pros: More explicit iteration control, allows for arbitrary logic inside the loop.
	* Cons: May be slower due to the overhead of the loop and potential branching.
2. **Test Case 2 (Object.fromEntries())**:
	* Pros: Faster execution since it leverages the optimized implementation of `Object.fromEntries()`.
	* Cons: Less control over iteration, may not work as expected if the array elements are not in the correct format.

**Library and Purpose**

In Test Case 1, there is no explicit reference to a library. However, `Array.from()` is a built-in JavaScript method used to create an array from an iterable or array-like object.

In Test Case 2, `Object.fromEntries()` is also a built-in JavaScript method used to create an object from key-value pairs passed as an array of arrays.

**Special JS Features and Syntax**

There are no explicit mentions of special JavaScript features or syntax in the provided code. However, note that `for...of` loops and `Object.fromEntries()` are relatively modern features introduced in ECMAScript 2015 (ES6).

**Alternatives**

Other alternatives for creating an object from an array could include:

1. Using the spread operator (`{ ...list }`) to create a new object with key-value pairs.
2. Utilizing libraries like Lodash or Ramda, which provide utilities for working with arrays and objects.

Keep in mind that these alternatives may have varying performance characteristics depending on the specific use case and requirements.

Related benchmarks:

lasdkjgflkhwu egcwjxer1231232 (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):