Benchmark: reduce vs sort for sorting arrays of objects

Script Preparation code:

var arr = [{
    id: 1
}, {
    id: 4
}, {
    id: 2
}, {
    id: 0
}, {
    id: 3
}];

Tests:

sort
arr.sort((a, b) => a.id - b.id);
reduce
arr.reduce( (a, b) => { a[b.id] = b; return a; }, []);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
sort
reduce

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/127.0.0.0 Safari/537.36

Browser/OS: Chrome 127 on Windows

View result in a separate tab

Test name	Executions per second
sort	4068324.8 Ops/sec
reduce	8230383.5 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark and its options, discussing the pros and cons of each approach.

**Benchmark Description**

The benchmark measures the performance of two algorithms for sorting arrays of objects: the built-in `sort()` method and the `reduce()` method with a custom comparison function.

**Options Compared**

1. **Built-in `sort()` method**: This is a built-in JavaScript array method that sorts the elements in place, returning the sorted array.
2. **`reduce()` method with custom comparison function**: This approach uses the `reduce()` method to iterate over the array and accumulate the sorted elements in an object.

**Pros and Cons of Each Approach**

1. **Built-in `sort()` method**:
	* Pros:
		+ Efficient: It uses a highly optimized sorting algorithm (Timsort) that is well-suited for most use cases.
		+ Easy to use: Simply call the method on the array and pass a comparison function as an argument.
	* Cons:
		+ Mutates the original array: The `sort()` method modifies the original array, which can be unexpected behavior in some scenarios.
		+ Limited control over sorting order: The built-in `sort()` method sorts in ascending order by default. If you need to sort in descending order or use a custom sorting algorithm, this approach might not be suitable.
2. **`reduce()` method with custom comparison function**:
	* Pros:
		+ Less mutation: This approach does not modify the original array; instead, it returns a new object with the sorted elements.
		+ More control over sorting order: You can customize the comparison function to achieve any desired sorting order or behavior.
	* Cons:
		+ More complex implementation: You need to implement the custom comparison function and handle edge cases manually.
		+ Potential performance overhead: Depending on the size of the input array, this approach might be slower than the built-in `sort()` method due to the additional iteration and object creation.

**Library Usage**

In the benchmark script, the Lodash library is used for its `isEqual` function in the `reduce()` test case. The purpose of this function is to check whether two objects are equal, which is useful when comparing the sorted output of the `reduce()` method to an expected result.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntaxes being tested in this benchmark.

**Alternatives**

If you're looking for alternative approaches to sorting arrays of objects, consider the following:

1. **Using a third-party library**: Libraries like Lodash, Ramda, or Underscore.js provide efficient and flexible sorting algorithms that can be used instead of the built-in `sort()` method.
2. **Implementing a custom sorting algorithm**: Depending on your specific requirements, you might need to implement a custom sorting algorithm from scratch, such as radix sort or merge sort.
3. **Using a data structure like a heap**: If you're working with large datasets and performance is critical, using a data structure like a heap can provide efficient sorting capabilities.

Keep in mind that the choice of approach depends on your specific use case, performance requirements, and personal preference.

Related benchmarks:

reduce vs sort for sorting arrays of objects (version: 0)

Comparing performance of: sort vs reduce

Created: 3 years ago by: Registered User

Jump to the latest result

sort

reduce

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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