Benchmark: Chunk array slice vs for loop

Script Preparation code:

var data = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];

Tests:

slice
/* function* getBatch(records, chunksize = 10) { while (records.length) { yield records.splice(0, chunksize); } } */ let chunksize = 10; let pos = 0; let chunk = []; while (pos <= data.length) { chunk = data.slice(pos, pos + chunksize); console.log(chunk); pos = pos + chunksize; }
push
let chunksize = 10; let pos = 0; let chunk = []; for (let pos = 0; pos <= data.length; pos++) { chunk.push(data[pos]); if (pos % chunksize === 0 || pos === data.length) { console.log(chunk); chunk = []; } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
push

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark is comparing two approaches to chunking an array: using `Array.prototype.slice()` and using a traditional for loop with `push()`. The goal is to determine which approach is faster in terms of execution time.

**Options Compared**

The two options being compared are:

1. **`Array.prototype.slice()`**: This method creates a new array containing a subset of elements from the original array, starting at the specified index and ending at the specified end index.
2. **Traditional for loop with `push()`**: This approach uses a for loop to iterate over the array, pushing each element onto a new array.

**Pros and Cons**

* `Array.prototype.slice()`:
	+ Pros: concise and readable syntax, creates a new array without modifying the original, can be used with other methods like `map()` or `filter()`.
	+ Cons: may involve more overhead due to the creation of a new array, can lead to slower performance if not optimized.
* Traditional for loop with `push()`:
	+ Pros: can be more efficient in terms of memory usage and execution time, especially when working with large datasets.
	+ Cons: more verbose syntax, can modify the original array if not careful.

**Library**

In this benchmark, there is no explicit library being used. However, it's worth noting that `Array.prototype.slice()` is a built-in method in JavaScript, making it an essential part of the language itself.

**Special JS Feature or Syntax**

There is no special feature or syntax being tested in this benchmark. The focus is solely on comparing two different approaches to chunking an array.

**Other Alternatives**

For chunking arrays, other alternatives to `Array.prototype.slice()` and traditional for loops include:

1. **`Array.from()`**: This method creates a new array from an iterable source, including the spread operator (`...`) which can be used to create chunks.
2. **`reduce()`**: This method applies a reduction function to each element in an array, which can be used to create chunks.
3. **Third-party libraries**: Libraries like Lodash or Moment.js provide additional methods for chunking arrays.

In conclusion, the benchmark is testing two approaches to chunking arrays: using `Array.prototype.slice()` and traditional for loops with `push()`. The results indicate that `Array.prototype.slice()` may be slower in this specific test case, highlighting the importance of considering performance when choosing an approach.

Related benchmarks:

Chunk array slice vs for loop (version: 0)

Comparing performance of: slice vs push

Created: 3 years ago by: Guest

Jump to the latest result

slice

push

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):