Benchmark: 123454 - MeasureThat.net

Script Preparation code:

var array = [
  obj = {
    'a': null,
    'b': 1,
    'c': null,
    'd': 1,
    'e': 1,
    'f': 1,
    'g': null,
  }
]

Tests:

ForEach
array.forEach((obj) => { Object.keys(obj).forEach((key) => { if (obj[key] === null) delete obj[key] }) })
FromEntries
array.forEach((obj) => { Object.keys(obj).filter(key => key !== null) })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
ForEach
FromEntries

Fastest: N/A

Slowest: N/A

Latest run results:

No previous 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 dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition**

The provided benchmark definition is a JSON object that represents the test case. It has two main sections: Script Preparation Code and Html Preparation Code (which is empty in this case). The script preparation code defines an array variable `array` with an object `obj` containing multiple null values. This setup is likely used to create a scenario where the benchmark will test the performance of iterating over the object's keys.

**Script Comparison**

The benchmark compares two different approaches:

1. **ForEach**: This approach uses the `forEach` method on the array, which iterates over each element in the array and calls the provided callback function for each one.
2. **FromEntries**: This approach uses the `Object.fromEntries()` method, which creates a new object from an iterable of key-value pairs.

**Pros and Cons**

* **ForEach**
	+ Pros:
		- Simple and straightforward implementation
		- Easy to understand and maintain
	+ Cons:
		- May be slower due to the overhead of iterating over the array's indices
		- May not be as efficient as other approaches, like `FromEntries`
* **FromEntries**
	+ Pros:
		- Can be faster due to the optimized implementation of `Object.fromEntries()`
		- Eliminates the need for manual index iteration
	+ Cons:
		- Less intuitive and more complex implementation
		- May have additional overhead due to object creation

**Other Considerations**

* **Null Values**: The presence of null values in the object can affect the performance of the benchmark. In this case, the `ForEach` approach will iterate over each key-value pair, including the ones with null values.
* **Array Size**: The size of the array is not specified in the benchmark definition, but it's likely that a small to medium-sized array is used for demonstration purposes.

**Library: Object.fromEntries()**

The `Object.fromEntries()` method is a relatively new addition to JavaScript (introduced in ECMAScript 2015). It creates a new object from an iterable of key-value pairs and is designed to be more efficient than the traditional `Object.assign()` method.

**Special JS Feature/Syntax: None mentioned**

There are no special JavaScript features or syntaxes used in this benchmark, other than the introduction of `Object.fromEntries()` which is a relatively common feature in modern web development.

**Alternatives**

If you want to explore alternative approaches for iterating over objects in JavaScript, here are some options:

1. **Using `for...in` loop**: An older approach that iterates over an object's properties using the `for...in` loop.
2. **Using a custom iterator**: Creating a custom iterator function to iterate over the object's keys.
3. **Using other libraries or frameworks**: Depending on your specific use case, you may want to explore using other libraries or frameworks that provide optimized iteration mechanisms.

Keep in mind that these alternatives might not be as efficient or well-tested as `Object.fromEntries()` or the built-in `forEach` method.

Related benchmarks:

123454 (version: 0)

Comparing performance of: ForEach vs FromEntries

Created: 3 years ago by: Guest

Jump to the latest result

ForEach

FromEntries

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):