Benchmark: fight to the death - for loop vs chained array methods (10,000,000) minus sort

Script Preparation code:

const randomStDate = () => {
    const randD = new Date(new Date("2021-12-05").getTime() + Math.random() * (new Date("2026-12-05").getTime() - new Date("2023-12-05").getTime()))
    let month = '' + (randD.getMonth() + 1);
    let day = '' + randD.getDate();
    let year = randD.getFullYear();
    if (month.length < 2) month = '0' + month;
    if (day.length < 2) day = '0' + day;
    return [year, month, day].join('-');

};

const rndId = Math.floor(Math.random() * (100000000 - 1 + 1) + 1)

const createArr = () => {
    let workArr = []
    for (let i = 0; i < 100000; i++) {
        const pl = {
            tisId: rndId,
            startDate: randomStDate(),
            endDate: "2026-12-05",
            site: "Liverpool",
        }
        workArr.push(pl)

    }
    return workArr
}

var workArr = createArr()
var today = new Date().toISOString().slice(0, 10)

Tests:

for loop (removed the additional sort to make myself feel better)
let pastArr = []; let futureArr = []; for (let i = 0; i < workArr.length; i++) { const pl = workArr[i]; switch(true){ case pl.startDate <= today : pastArr.push(pl); break; case futureArr.length < 1 && pl.startDate > today : futureArr = [pl]; break; case futureArr.length > 0 && pl.startDate < futureArr[0].startDate : futureArr = [pl]; break; case futureArr.length > 0 && pl.startDate === futureArr[0].startDate : futureArr.push(pl); break; } } return [...pastArr, ...futureArr];
chained arr methods
const firstFutureWorks = workArr .filter(w => w.startDate > today) .sort((a, b) => (a.startDate > b.startDate ? 1 : -1)); const nextFutureDate = firstFutureWorks[0] ? firstFutureWorks[0].startDate : today; return workArr.filter(w => w.startDate <= nextFutureDate);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for loop (removed the additional sort to make myself feel better)
chained arr methods

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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 is tested on MeasureThat.net.

**Benchmark Definition**

The benchmark compares two approaches for filtering an array of objects based on their `startDate` property: a traditional `for` loop method and chained array methods (filtering and sorting).

**Script Preparation Code**

The script generates a large array (`workArr`) containing 100,000 objects with random `startDate` properties. The script also defines two empty arrays, `pastArr` and `futureArr`, which will be used to store filtered objects.

**Options Compared**

1. **For Loop Method**: This approach uses a traditional `for` loop to iterate through the `workArr` array, checking each object's `startDate` property against the current date (`today`). Based on the comparison, the object is either added to `pastArr` or `futureArr`.
2. **Chained Array Methods (filtering and sorting)**: This approach uses chained methods (filter() and sort()) to process the `workArr` array. First, it filters out objects with a `startDate` greater than the current date (`today`). Then, if there are remaining objects, it sorts them based on their `startDate` property.

**Pros and Cons of Each Approach**

1. **For Loop Method**:
	* Pros: Can be more efficient for large arrays since it avoids creating temporary sorted arrays.
	* Cons: Can be slower due to the overhead of the loop and individual comparisons.
2. **Chained Array Methods (filtering and sorting)**:
	* Pros: Faster since it leverages optimized JavaScript engine performance for filtering and sorting.
	* Cons: May create temporary sorted arrays, which can consume memory.

**Library Used**

None explicitly mentioned in the provided JSON.

**Special JS Features or Syntax**

The benchmark uses JavaScript's arrow functions (`const pl = () => { ... }`), destructuring assignment (`let [year, month, day] = randD.toISOString().split('-');`), and template literals (`'' + randD.getMonth() + 1;`).

**Other Alternatives**

If you're interested in exploring other approaches, here are a few options:

* **Regular Expressions**: You could use regular expressions to filter the array, but this might not be as efficient or readable as the chained array methods approach.
* **Set-Based Operations**: Another approach would be to use set-based operations (e.g., `Set` data structure) to efficiently filter and sort the array. However, this might require additional setup and understanding of set operations.

Keep in mind that these alternatives might not provide a significant performance improvement over the chained array methods approach for this specific benchmark.

Related benchmarks:

fight to the death - for loop vs chained array methods (10,000,000) minus sort (version: 1)

remove the sort from for loop method

Comparing performance of: for loop (removed the additional sort to make myself feel better) vs chained arr methods

Created: 3 years ago by: Registered User

Jump to the latest result

for loop (removed the additional sort to make myself feel better)

chained arr methods

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):