Benchmark: Reduce using spread and push

Tests:

Spread
const foo = []; for (let i = 0; i < 10000; i++) { foo.push(i); } const bar = foo.reduce((acc, value) => { if (acc % 5) { return [...acc, value]; } return acc; });
Push
const foo = []; for (let i = 0; i < 10000; i++) { foo.push(i); } const bar = foo.reduce((acc, value) => { if (acc % 5) { acc.push(value); } return acc; });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread
Push

Fastest: N/A

Slowest: N/A

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

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Let's dive into the world of JavaScript microbenchmarks.

**What is being tested?**

The provided benchmark tests two approaches for reducing an array in JavaScript:

1. **Push**: This approach involves using the `push()` method to add elements to the end of the array, and then using the `reduce()` method to iterate over the array and perform some operation on each element.
2. **Spread**: This approach involves spreading the original array into a new array using the spread operator (`...`), and then using the `reduce()` method on the new array.

**Options compared**

The two approaches being tested are:

* Using `push()` to add elements to the end of the array
* Spreading the original array into a new array using the spread operator (`...`)

**Pros and Cons of each approach:**

1. **Push**:
	* Pros:
		+ Can be more efficient in terms of memory usage, since it avoids creating a new array.
		+ Can be faster for small arrays or arrays with few elements.
	* Cons:
		+ May be slower for large arrays due to the overhead of repeatedly pushing elements onto the end of the array.
		+ Requires iterating over the entire array in each iteration of the `reduce()` method, which can lead to high memory usage and slower performance.
2. **Spread**:
	* Pros:
		+ Can be faster for large arrays due to the avoidance of repeated `push()` calls.
		+ Reduces the need for multiple iterations over the original array.
	* Cons:
		+ Creates a new array, which can lead to increased memory usage and slower performance.
		+ Requires additional computation to create the new array.

**Library/Function used**

In both test cases, the `reduce()` method is used from the ECMAScript Standard Library. The purpose of this method is to reduce an iterable (such as an array) to a single value.

**Special JS feature or syntax**

There are no special JavaScript features or syntaxes being tested in these benchmarks. However, it's worth noting that the use of `...` (spread operator) and `push()` methods is specific to modern JavaScript dialects.

**Other alternatives**

For reducing an array, other approaches could include:

* Using a loop with indices: `for (let i = 0; i < arr.length; i++) { /* perform operation */ }`
* Using the `forEach()` method: `arr.forEach((element) => { /* perform operation */ });`
* Using a different library or framework that provides an optimized array reduction algorithm.

However, these alternatives are not being tested in this specific benchmark.

Related benchmarks:

Reduce using spread and push (version: 0)

Comparing performance of: Spread vs Push

Created: 6 years ago by: Guest

Jump to the latest result

Spread

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):