Benchmark: ok5}O.54<'fn9ZN2KFz-

Script Preparation code:

var getObject = () => Object.fromEntries(Array.from({
    length: 5000
}).map((_, i) => [i, Math.random()]))

Tests:

Object.values(obj)
var a = getObject(); let sum = 0; Object.values(a).forEach((v) => { sum += v });
for...in
var a = getObject(); let sum = 0; for (var key in a) { const v = a[key]; sum += v; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.values(obj)
for...in

Fastest: N/A

Slowest: N/A

Latest run results:

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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 data and explain what's being tested in each benchmark.

**Benchmark Definition**
The first section of the JSON data represents a benchmark definition, which is used to create and run JavaScript microbenchmarks on the MeasureThat.net website. The key fields in this section are:

* `Name`: A unique name for the benchmark.
* `Description`: A brief description of the benchmark.
* `Script Preparation Code`: A JavaScript code snippet that prepares the environment before running the benchmark.
* `Html Preparation Code`: An optional HTML code snippet that can be used to prepare the webpage before running the benchmark. In this case, it's set to `null`.

**Individual Test Cases**
The second section of the JSON data represents individual test cases for each benchmark. Each test case has the following fields:

* `Benchmark Definition`: The actual JavaScript code snippet that tests a specific aspect of the language.
* `Test Name`: A descriptive name for the test case.

In this example, there are two test cases:

1. `Object.values(obj)`: Tests the performance of using `Object.values()` to iterate over an object's properties and sum their values.
2. `for...in`: Tests the performance of using a traditional `for` loop with the `in` keyword to iterate over an object's properties and sum their values.

**Library Usage**
In both test cases, no external libraries are used.

**Special JS Features/Syntax**
The `Object.values()` method is a modern JavaScript feature that was introduced in ECMAScript 2019 (ES11). It allows iterating over the value of an object without exposing its own prototype chain. This is done by calling `Object.values()` on an object, which returns an array containing all the property values.

**Performance Comparison**
The two test cases compare the performance of using `Object.values()` versus a traditional `for` loop with the `in` keyword to iterate over an object's properties and sum their values. The choice between these approaches depends on various factors, including:

Pros of using `Object.values()`: faster, more concise code; does not expose the prototype chain.
Cons of using `Object.values()`: requires modern JavaScript features (ES11+); may have performance issues in older browsers.

Pros of traditional `for` loop with `in`: well-supported across older browsers; does not require modern JavaScript features.
Cons of traditional `for` loop with `in`: more verbose code; can be slower due to the overhead of iterating over an object's properties.

**Other Alternatives**
For this specific use case, there are no significant alternatives to using either `Object.values()` or a traditional `for` loop with `in`. However, if you need to support older browsers that do not have access to modern JavaScript features like `Object.values()`, you may want to consider using other methods, such as:

* Using a library like Lodash's `_.values()` function
* Manually iterating over an object's properties using `for (const key in obj) { ... }`
* Using a polyfill for the `Object.values()` method

Keep in mind that these alternatives may have different performance characteristics and code complexity, so it's essential to consider your specific use case and requirements when choosing an approach.

Related benchmarks:

ok5}O.54<'fn9ZN2KFz- (version: 0)

asd

Comparing performance of: Object.values(obj) vs for...in

Created: 2 years ago by: Guest

Jump to the latest result

Object.values(obj)

for...in

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):