Benchmark: ES6 spread operator vs. Array.prototype.reduce()

Tests:

Spread operator
var myArray = [27, 11, 46, 64, 62, 42, 5, 9]; Math.max(...myArray);
Array.prototype.reduce()
var myArray = [27, 11, 46, 64, 62, 42, 5, 9]; myArray.reduce((a, b) => Math.max(a, b))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread operator
Array.prototype.reduce()

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 11 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser/OS: Chrome 136 on Linux

View result in a separate tab

Test name	Executions per second
Spread operator	235297808.0 Ops/sec
Array.prototype.reduce()	174161744.0 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark is comparing two approaches to find the maximum value in an array: using the spread operator (`...`) and `Array.prototype.reduce()`. The script preparation code and HTML preparation code are both empty, which suggests that the focus is on comparing the JavaScript implementation rather than other factors like DOM manipulation or rendering.

**Options Compared**

There are two options being compared:

1. **Spread Operator**: Using the spread operator (`...`) to extract a subset of an array's elements, in this case, to find the maximum value.
2. **Array.prototype.reduce()**: Using the `reduce()` method provided by the Array prototype to accumulate and compute the maximum value.

**Pros and Cons**

Here are some general pros and cons of each approach:

1. **Spread Operator**:
	* Pros: concise, easy to read, and efficient for small arrays.
	* Cons: can be slower for large arrays due to the overhead of creating a new array.
2. **Array.prototype.reduce()**:
	* Pros: flexible, allows for accumulation, and can handle large arrays efficiently.
	* Cons: more verbose, and its performance may degrade for very large arrays.

In general, for small arrays or cases where the maximum value is not needed beyond that, the spread operator might be a better choice. However, when dealing with larger datasets or multiple aggregations, `Array.prototype.reduce()` can provide more flexibility and efficiency.

**Library Usage**

There are no libraries being used in this benchmark.

**Special JS Features or Syntax**

The benchmark uses the following features:

* **Spread Operator (ES6)**: The spread operator (`...`) is a new feature introduced in ECMAScript 2015 (ES6) that allows extracting a subset of an array's elements.
* **Array.prototype.reduce()**: This method was also introduced in ES6, providing a way to accumulate and compute values for arrays.

**Other Alternatives**

If you needed to compare other approaches, here are some alternatives:

1. **Destructuring Assignment**: Similar to the spread operator, but used for object property extraction.
2. **Array.prototype.map() + Math.max()**: This approach can be used instead of `reduce()` by applying `Math.max()` to an array mapped from another value.
3. **Looping through the array**: A straightforward loop-based approach to find the maximum value.

Note that these alternatives might have different performance characteristics, syntax, and use cases compared to the spread operator and `Array.prototype.reduce()`.

Related benchmarks:

ES6 spread operator vs. Array.prototype.reduce() (version: 0)

Comparing performance of: Spread operator vs Array.prototype.reduce()

Created: 8 years ago by: Guest

Jump to the latest result

Spread operator

Array.prototype.reduce()

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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