Benchmark: Lodash sumBy vs map and 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,"value");
map and reduce
arr.map(item => item.value).reduce((prev, next) => prev + next);

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

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36

Browser/OS: Chrome 127 on Mac OS X 10.15.7

View result in a separate tab

_.sumBy

1K/s

map and reduce

807/s

View exact numbers

Test name	Executions per second
✓ _.sumBy	1,462 Ops/sec
map and reduce	807 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Explanation**

The provided benchmark measures the performance of two approaches to calculate the sum of values in an array: `Lodash sumBy` versus `map and reduce`.

The test data consists of an array of 100,000 objects, each with a random value between 0 and 100. The `getRandomInt` function generates these random values.

**Options Compared**

There are two options being compared:

1. **_sumBy**: This is a function from the Lodash library that calculates the sum of a property in an array using a callback function. In this case, it's used with the `value` property.
2. **Map and Reduce**: This is a built-in JavaScript approach that uses the `map` method to create a new array with transformed values and then applies the `reduce` method to sum up these values.

**Pros and Cons**

* **_sumBy**:
	+ Pros: Often faster than `map and reduce`, especially for smaller datasets, since it avoids creating an intermediate array.
	+ Cons: Requires the Lodash library, which may add overhead. Also, its performance can degrade if the callback function is complex or expensive to compute.
* **Map and Reduce**:
	+ Pros: No external dependencies required, as it's a built-in JavaScript method. Can be more efficient for large datasets since it avoids creating an intermediate array.
	+ Cons: Creates an additional array during the transformation process, which can lead to increased memory usage.

**Other Considerations**

* **Library Usage**: The test case uses the Lodash library for `_sumBy`. This is a popular utility library that provides many functional programming helpers. However, it does add overhead due to its complexity and size.
* **JavaScript Features**: Neither of these approaches utilizes any special JavaScript features or syntax.

**Alternative Approaches**

Other alternatives to consider:

1. **Array.prototype.reduce() only**: Without using `map`, you can directly apply the reduction function to the original array. This would bypass creating an intermediate array, but might be slower for large datasets.
2. **Using a custom implementation**: Depending on your specific use case and performance requirements, you might want to consider implementing a custom sum-by algorithm that avoids both Lodash's overhead and the memory usage of `map` and `reduce`.

In summary, this benchmark helps evaluate the performance of two approaches: `Lodash sumBy` versus `map and reduce`. The choice between these options depends on your specific requirements, such as performance needs and library dependencies.

Lodash sumBy vs map and reduce (version: 0)

Comparing performance of: `_.sumBy vs map and reduce`

Created: 8 years ago by: Guest

Go to the latest result

_.sumBy

map and reduce

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Lodash sumBy vs map and reduce (version: 0)

Comparing performance of: _.sumBy vs map and reduce

Created: 8 years ago by: Guest

Go to the latest result

_.sumBy

map and reduce

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: `_.sumBy vs map and reduce`