Benchmark: Lodash sumBy with lambda vs Array reduce

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

function getRandomInt(max) {
  return Math.floor(Math.random() * Math.floor(max));
}

var arr = [];
for(var i = 0; i < 100000; i++){
  arr.push({value:getRandomInt(100)});
}

Tests:

_.sumBy
_.sumBy(arr,x => x.value);
map and reduce
arr.reduce((prev, next) => prev + next.value, 0);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.sumBy
map and reduce

Fastest: N/A

Slowest: N/A

Autogenerated LLM Sumamry (model llama3.2:3b, generated 2 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of MeasureThat.net and explore what's being tested in this benchmark.

**Overview**

This benchmark compares two approaches to calculate the sum of values in an array: `_.sumBy` from Lodash and the `Array.prototype.reduce()` method. We'll break down each test case, explain the options being compared, their pros and cons, and discuss any special JavaScript features or syntax used.

**Test Case 1: _.sumBy**

The benchmark definition is:
```
_.sumBy(arr,x => x.value);
```
This uses the `_.sumBy()` function from Lodash, which takes an array (`arr`) and a callback function (`x => x.value`). The callback function extracts the value from each object in the array (`x.value`).

**Options being compared**

In this test case, only one option is being compared:

* `_.sumBy(arr,x => x.value)`

Pros of using `_._sumBy()`:

* Concise and expressive code
* Avoids manual iteration over the array

Cons:

* Depends on Lodash library being loaded

**Alternative approach**

The alternative approach used in the benchmark is:
```
arr.reduce((prev, next) => prev + next.value, 0);
```
This uses the `Array.prototype.reduce()` method to iterate over the array and sum up the values.

Pros of using `reduce()`:

* Built-in method in JavaScript
* No external library dependency

Cons:

* Requires manual iteration over the array (in this case, using a callback function)

**Test Case 2: map and reduce**

The benchmark definition is:
```
arr.reduce((prev, next) => prev + next.value, 0);
```
This uses the `Array.prototype.reduce()` method to iterate over the array and sum up the values.

**Options being compared**

In this test case, two options are being compared:

* `arr.reduce((prev, next) => prev + next.value, 0)`
* `_.sumBy(arr,x => x.value)` (which is not present in the provided benchmark result)

Pros of using `reduce()`:

* Built-in method in JavaScript
* No external library dependency

Cons:

* Requires manual iteration over the array (in this case, using a callback function)

**Library: Lodash**

Lodash is a utility library that provides various functions for functional programming, data manipulation, and more. In this benchmark, `_.sumBy()` is used to calculate the sum of values in an array.

**DevicePlatform: Desktop**

The benchmark was run on a desktop device (Linux).

**Other considerations**

* The benchmark uses a large array (`arr`) with 100,000 elements, which may lead to performance differences between the two approaches.
* The `getRandomInt()` function is used to populate the array with random values, which can affect the performance of the benchmark.

**Alternatives**

If you're looking for alternative libraries or methods to calculate the sum of values in an array, here are a few options:

* `Array.prototype.forEach()`: This method allows you to iterate over the array and perform an action on each element. You could use it with a callback function to calculate the sum.
* `forEach` with `map` and `reduce`: Another approach is to use `forEach()` to iterate over the array, then use `map()` to extract the values, and finally use `reduce()` to calculate the sum.
* External libraries like `Ramda` or `PicoReduce` provide similar functionality to Lodash's `_.sumBy()`.

Latest run results:

Run details: (Test run date: 4 days ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser/OS: Chrome 128 on Linux

View result in a separate tab

Test name	Executions per second
_.sumBy	1139.1 Ops/sec
map and reduce	1740.9 Ops/sec

Related benchmarks:

Lodash sumBy with lambda vs Array reduce (version: 0)

Comparing performance of: _.sumBy vs map and reduce

Created: 4 days ago by: Guest

Jump to the latest result

_.sumBy

map and reduce

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Sumamry (model llama3.2:3b, generated 2 days ago):