Benchmark: Array spread operator vs push 3

Tests:

spread operator
[1,2,3,4,5,6,7,8,9].reduce((acc, item) => item % 2 ? [...acc, item] : acc, [])
Push
[1,2,3,4,5,6,7,8,9].reduce((acc, item) => { if(item % 2) { acc.push(item); return acc; } else { return acc} }, [])

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread operator
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 provided benchmark JSON and explain what's being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark is comparing two methods to achieve a similar result: using the new ES6 spread operator (`...`) versus the traditional `concat()` method with the `push` array method. The goal is to determine which approach is faster for this specific use case.

**Options being compared**

1. **ES6 Spread Operator (`...`)**: This syntax was introduced in ECMAScript 2015 (ES6) and allows creating a new array by spreading an existing array or an array literal.
2. **Traditional `concat()` method with `push`**: This is the older approach to achieve the same result, where you use `concat()` to create a new array and then push elements onto it.

**Pros and Cons**

* **ES6 Spread Operator (`...`)**:
	+ Pros: More concise, readable, and expressive code. It's also more efficient because it avoids creating an intermediate array.
	+ Cons: Limited support in older browsers (pre-ES6), which might affect benchmark results.
* **Traditional `concat()` method with `push`**:
	+ Pros: Wide browser compatibility, including older versions. It's a well-established and widely understood syntax.
	+ Cons: Less readable and more verbose code, as it creates an intermediate array that needs to be pushed onto.

**Library usage**

In the benchmark definition JSON, there is no explicit library mentioned. However, in one of the individual test cases, you'll notice the use of `reduce()` with a callback function. The `reduce()` method is a part of the Array prototype and is not considered a separate library. It's a built-in JavaScript method.

**Special JS feature or syntax**

The benchmark makes use of ES6 features, specifically:

* Spread operator (`...`)
* Template literals (used for string interpolation in the `push` test case)

If your browser doesn't support these features, it might affect the benchmark results.

**Other alternatives**

For those who want to explore alternative approaches or optimize their code further:

1. **Using `Array.prototype.map()`**: Instead of using `reduce()`, you can use `map()` to achieve a similar result.
```javascript
[1, 2, 3].map(item => item % 2 ? [...[]] : []).push(item);
```
However, this approach might not be as efficient for large datasets due to the overhead of creating an empty array.

2. **Using `Array.prototype.forEach()`**: Another alternative is using `forEach()` instead of `reduce()`, but it's generally less efficient and more verbose.
```javascript
[1, 2, 3].forEach(item => {
  if (item % 2) {
    [item];
  }
});
```
Keep in mind that these alternatives might not provide a significant performance boost for this specific use case.

In summary, the benchmark is testing two approaches: using the ES6 spread operator versus the traditional `concat()` method with `push`. The choice between these methods depends on your specific requirements, browser support, and personal coding style.

Related benchmarks:

Array spread operator vs push 3 (version: 0)

Compare the new ES6 spread operator with the traditional concat() method and push

Comparing performance of: spread operator vs Push

Created: 6 years ago by: Guest

Jump to the latest result

spread operator

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):