Benchmark: fight to the death - for loop vs chained methods 1000

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 < 1000; 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
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].sort((a, b) => (a.startDate > b.startDate ? 1 : -1));
chained arr
const today = new Date().toISOString().slice(0,10) 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
chained arr

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 dive into the world of MeasureThat.net and analyze the provided benchmark.

**Benchmark Definition**

The benchmark is designed to compare two approaches: using a traditional for loop and using chained methods (also known as method chaining) in JavaScript. The test case generates an array of 1000 objects, each with a random start date between December 5th, 2021, and December 5th, 2026.

**For Loop Approach**

The traditional for loop approach iterates over the `workArr` array using a traditional loop:
```javascript
for (let i = 0; i < workArr.length; i++) {
  const pl = workArr[i];
  // ...
}
```
This approach is straightforward and easy to understand.

**Chained Methods Approach**

The chained methods approach uses the `filter()` and `sort()` methods in combination:
```javascript
const firstFutureWorks = workArr
  .filter(w => w.startDate > today)
  .sort((a, b) => (a.startDate > b.startDate ? 1 : -1));
```
This approach is more concise and might be considered more "JavaScript-like."

**Pros and Cons**

Here are some pros and cons of each approach:

**For Loop Approach:**

Pros:

* Easy to understand and predict
* No need for additional libraries or modules

Cons:

* Can be slower due to the overhead of the traditional loop

**Chained Methods Approach:**

Pros:

* Concise and "JavaScript-like"
* Might be faster due to reduced overhead

Cons:

* Less predictable performance, as the browser's engine may optimize it differently
* Requires more understanding of the `filter()` and `sort()` methods

**Other Considerations**

The benchmark also mentions that the test case uses a special JavaScript feature called "ARIA attributes." ARIA (Accessible Rich Internet Applications) is a set of attributes used to make web content more accessible to screen readers and other assistive technologies. While not directly related to performance, it's worth noting that this feature might affect the rendering and parsing of the code.

**Library and Syntax**

There are no libraries or special syntax mentioned in the benchmark definition. However, it's worth noting that some browsers have built-in optimizations for certain JavaScript constructs, such as `filter()` and `sort()`.

In summary, the benchmark compares two approaches to sorting an array: a traditional for loop and chained methods using `filter()` and `sort()`. The for loop approach is more predictable but might be slower, while the chained methods approach is concise but less predictable.

Related benchmarks:

fight to the death - for loop vs chained methods 1000 (version: 0)

Comparing performance of: for loop vs chained arr

Created: 3 years ago by: Registered User

Jump to the latest result

for loop

chained arr

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):