Benchmark: trgrtgrtgtrgtrgtr

Script Preparation code:

var data = [];
var res = [];

for (let i = 0; i < 150; i++) {
    data.push({
        id: i,
        bla: 'test',
        duration: 0
    });
}

for (let i = 0; i < 150; i++) {
    res.push({
        id: i,
        firstname: 'lastname',
        name: 'coucou',
        times: []
    });
}

for (var i = data.length - 1; i > 0; i--) {

    // Generate random number 
    var j = Math.floor(Math.random() * (i + 1));

    var temp = data[i];
    data[i] = data[j];
    data[j] = temp;
}

Tests:

forEach imbriqué
res.forEach(oElem => { data.forEach(oShuffle => { if (oElem.id === oShuffle.id) { oElem.times.push(oShuffle); } }); });
filter
res.forEach(oElem => { const aFilter = data.filter(oShuffle => oShuffle.id === oElem.id) || []; aFilter.forEach(oTest => { oElem.times.push(oTest); }); });
filter direct push
res.forEach(oElem => { const aFilter = data.filter(oShuffle => oShuffle.id === oElem.id) || []; oElem.times.push(aFilter); });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
forEach imbriqué
filter
filter direct push

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.

**What is being tested?**

The provided JSON represents a JavaScript microbenchmark test case on the MeasureThat.net website. The benchmark tests the performance of three different approaches for iterating over and filtering an array in JavaScript.

The test data consists of two arrays: `data` and `res`. The `data` array contains 150 objects with `id`, `bla`, and `duration` properties, while the `res` array also contains 150 objects with `id`, `firstname`, `name`, and `times` properties. The `times` property in the `res` array is initially an empty array.

The benchmark test cases are:

1. **forEach imbriqué** (nested `forEach`): This approach uses nested `forEach` loops to iterate over both arrays.
2. **filter**: This approach uses the `filter()` method to filter the `data` array and then pushes the filtered results into the `times` property of each object in the `res` array.
3. **filter direct push**: This approach is similar to the previous one, but it directly pushes the filtered results into the `times` property without using a separate variable.

**Options compared**

The three test cases are designed to compare the performance of different iteration and filtering approaches:

* Nested `forEach`: This approach uses nested loops to iterate over both arrays. It can be slower due to the overhead of the extra loop.
* Filter: This approach uses the `filter()` method, which is a built-in array method that iterates over the elements and returns a new array with only the desired elements. This approach can be faster because it uses a single iteration over the data.
* Filter direct push: This approach is similar to the previous one but directly pushes the filtered results into the `times` property without using a separate variable.

**Pros and cons**

Here are some pros and cons of each approach:

* Nested `forEach`:
	+ Pros: Easy to understand, can be modified to add additional logic.
	+ Cons: Can be slower due to the extra loop overhead.
* Filter:
	+ Pros: Fastest approach, uses a built-in array method.
	+ Cons: May require additional processing if the filter criteria are complex.
* Filter direct push:
	+ Pros: Similar performance to the `filter` approach, but avoids the need for an intermediate variable.
	+ Cons: Less readable than the `filter` approach due to the direct assignment.

**Library and purpose**

The `filter()` method is a built-in array method in JavaScript that returns a new array with only the elements that pass the test implemented by the provided function. In this benchmark, it is used to filter the `data` array and push the filtered results into the `times` property of each object in the `res` array.

**Special JS features or syntax**

There are no special JavaScript features or syntax mentioned in the provided code snippet. However, if we consider the use of the `forEach` method and the `filter()` method, they are both examples of functional programming principles in JavaScript.

**Other alternatives**

If you need to iterate over an array, here are some alternative approaches:

* For loops: Use traditional `for` loops with indices to iterate over arrays.
* Array.prototype.map(): Use the `map()` method to create a new array with transformed elements.
* Array.prototype.reduce(): Use the `reduce()` method to perform a reduction operation on the array.

Keep in mind that these alternatives may have different performance characteristics compared to the approaches tested in this benchmark.

Related benchmarks:

trgrtgrtgtrgtrgtr (version: 0)

Comparing performance of: forEach imbriqué vs filter vs filter direct push

Created: 2 years ago by: Guest

Jump to the latest result

forEach imbriqué

filter

filter direct push

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):