Benchmark: findIndex update vs for loop update edited 1

Script Preparation code:

var arr = new Array(2000000);
arr.fill({
    id: 0
});
arr = arr.map((el, idx) => el.id = idx);

var findItemIndex = (idToFind, list) => {
    var index = -1
    for (var i = 0; i < list.length; i++) {
        if (list[i].id === idToFind) {
            index = i;
            break;
        }
    }

    return index;
}
var itemsToUpdate = [{
    id: 100,
    updates: {
        name: "111"
    }
}, {
    id: 200,
    updates: {
        name: "111"
    }
}, {

    id: 400,
    updates: {
        name: "111"
    }

}, {
    id: 600,
    updates: {
        name: "111"
    }

}, {
    id: 800,
    updates: {
        name: "111"
    }

}]

Tests:

update via findIndex
itemsToUpdate.forEach((t) => { const storedIndex = arr.findIndex((tD) => { return tD.id === t.id }) if(storedIndex >= 0){ arr[storedIndex] = { ...arr[storedIndex], ...t.updates } } })
for loop update
itemsToUpdate.forEach((t) => { const storedIndex = findItemIndex(t.id, arr) if(storedIndex >= 0){ arr[storedIndex] = { ...arr[storedIndex], ...t.updates } } })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
update via findIndex
for loop update

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Windows

View result in a separate tab

for loop update

168/s

update via findIndex

21/s

View exact numbers

Test name	Executions per second
✓ for loop update	168 Ops/sec
update via findIndex	21 Ops/sec

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 being tested, the options compared, their pros and cons, and other considerations.

**Benchmark Definition**

The benchmark definition represents two different approaches to update elements in an array:

1. **For loop update**: The first approach uses a for loop to iterate over the `itemsToUpdate` array and updates each element in the `arr` array using the `findIndex` method.
2. **Update via findIndex**: The second approach uses the `findItemIndex` function to find the index of each element in the `arr` array and then updates the corresponding element using the `findIndex` method.

**Options Compared**

The two options being compared are:

* For loop update
* Update via findIndex

**Pros and Cons**

1. **For loop update**:
	* Pros: Generally faster and more efficient, as it avoids the overhead of the `findItemIndex` function.
	* Cons: Can be slower for large arrays, as it requires iterating over each element individually.
2. **Update via findIndex**:
	* Pros: More concise and elegant, as it uses a single function to perform both finding and updating operations.
	* Cons: May be slower due to the overhead of the `findItemIndex` function.

**Other Considerations**

* The benchmark is using a large array of 2 million elements for testing.
* Both approaches assume that the element being updated has an `id` property that can be used for lookup.
* The `itemsToUpdate` array contains five elements with identical `updates` objects, which may affect the performance results.

**Library and Special JS Feature**

The benchmark is using the following library:

* None explicitly mentioned, but it's likely that the JavaScript engine being tested (e.g., V8 in Chrome) is using its built-in implementation of the `findIndex` method.

There are no special JavaScript features or syntax used in this benchmark beyond what's standard for JavaScript.

**Alternatives**

Other alternatives for updating elements in an array include:

* Using `Array.prototype.map()` with a callback function, which can be more concise but may have performance implications.
* Using `Array.prototype.forEach()` with a callback function, which can provide better error handling and debugging capabilities.
* Implementing custom iteration logic using `for...of` loops or recursive functions.

However, the for loop update and update via findIndex approaches are likely to be among the most common and efficient methods used in practice.

findIndex update vs for loop update edited 1 (version: 2) Benchmark.js

Comparing performance of: `update via findIndex vs for loop update`

Created: 4 years ago by: Registered User

Go to the latest result

update via findIndex

for loop update

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

findIndex update vs for loop update edited 1 (version: 2) Benchmark.js

Comparing performance of: update via findIndex vs for loop update

Created: 4 years ago by: Registered User

Go to the latest result

update via findIndex

for loop update

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

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Comparing performance of: `update via findIndex vs for loop update`