Benchmark: Array.prototype.concat vs spread operator vs push (no jQuery test)

Tests:

spread operator
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]
Push
var params = [ "hello", true, 7 ]; params.push(1); params.push(2);

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:

Run details: (Test run date: one month ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:136.0) Gecko/20100101 Firefox/136.0

Browser/OS: Firefox 136 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
spread operator	31282894.0 Ops/sec
Push	173574576.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its test cases.

**Benchmark Overview**

The benchmark compares the performance of three different ways to create an array: using the spread operator (`...`), concatenation with `concat()`, and manual `push()` method.

**Test Case 1: Spread Operator**

In this test case, a sample array `params` is created with three elements: `"hello"`, `true`, and `7`. The test then creates another array `other` by using the spread operator to copy the elements of `params` into a new array. Specifically, the line `var other = [ 1, 2, ...params ]` uses the spread operator to create a shallow copy of `params`.

The purpose of this test case is to measure the performance of the spread operator as an efficient way to create arrays.

**Test Case 2: Push**

In this test case, a similar sample array `params` is created. However, instead of using the spread operator, the test manually adds two elements to `params` using the `push()` method: `params.push(1)` and `params.push(2)`. The goal of this test case is to measure the performance of manual array creation using the `push()` method.

**Library and Features**

The benchmark uses no external libraries, as specified in the "Script Preparation Code" field. However, it does use some syntax features specific to JavaScript:

* Spread operator (`...`): a feature introduced in ES6 (EcmaScript 2015) that allows creating arrays by spreading elements into an existing array.
* Template literals (`\r\nvar ...`) are used for readability and to create multiline code blocks.

**Pros, Cons, and Considerations**

Here's a brief summary of the pros and cons of each approach:

1. **Spread Operator (`...`)**:
	* Pros: concise, efficient, and modern.
	* Cons: only works with arrays, may be slower for very large datasets due to overhead from creating an intermediate array.
2. **Concatenation with `concat()`**:
	* Pros: widely supported, can handle any type of data.
	* Cons: less concise, potentially slower than the spread operator.
3. **Manual `push()` method**:
	* Pros: flexible, allows for easy modification of the initial array.
	* Cons: more verbose, may be slower due to the overhead of multiple push operations.

When choosing an approach, consider the trade-offs between conciseness, efficiency, and flexibility. The spread operator is a good choice when creating arrays with existing data, while manual `push()` method might be preferred for more complex use cases or when working with large datasets.

**Other Alternatives**

If you're looking for alternative approaches to create arrays, consider the following:

* **Array.from()**: introduced in ES6 (EcmaScript 2015) as a faster and more efficient way to create arrays from iterables.
* **Array.push.apply()**: uses the `apply()` method to pass the array elements as an argument to the `push()` method.
* **String.prototype.split()**: can be used to split strings into arrays, although this may not be the most efficient approach for large datasets.

Keep in mind that each alternative has its own trade-offs and use cases.

Related benchmarks:

Array.prototype.concat vs spread operator vs push (no jQuery test) (version: 0)

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

Comparing performance of: spread operator vs Push

Created: 5 years ago by: Guest

Jump to the latest result

spread operator

Push

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):