Benchmark: Push vs concat vs decon

Tests:

Decon
var params = [ "hello", true, 7 ] var other = [ ...params, 'new' ]
Push
var params = [ "hello", true, 7 ]; params.push('new');
Concat
var params = [ "hello", true, 7 ]; params.concat(['new']);
Index
var params = [ "hello", true, 7 ]; params[params.length] = 'new';

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Decon
Push
Concat
Index

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and their pros/cons.

**Benchmark Definition**

The benchmark definition is a JSON object that contains information about the test. It doesn't contain any actual code, but rather specifies the script preparation code, HTML preparation code, and benchmark name.

In this case, the benchmark name is "Push vs concat vs decon". This suggests that three different approaches are being compared:

1. **Push**: using the `push()` method to add an element to the array.
2. **Concat**: using the `concat()` method to concatenate arrays.
3. **Decon**: using destructuring assignment (`...params`) to create a new array with elements from the original array.

**Individual Test Cases**

Each test case is defined by a JSON object that contains the benchmark definition and a test name. The benchmark definitions are simple JavaScript expressions that create an array `params` with three initial elements: `"hello"`, `true`, and `7`.

The test cases differ only in how they add a new element to the `params` array:

1. **Decon**: uses destructuring assignment (`...params`) to create a new array with all elements from the original array, including the new one.
2. **Push**: uses the `push()` method to add a new element to the end of the array.
3. **Concat**: uses the `concat()` method to concatenate an array containing the new element to the existing array.
4. **Index**: uses index assignment (`params[params.length]`) to access and set the last element in the array.

**Library Usage**

None of the test cases use any external libraries.

**Special JS Features or Syntax**

The only notable feature used is destructuring assignment, which is a modern JavaScript syntax introduced in ECMAScript 2015 (ES6). It allows you to extract values from an object or array into separate variables. In this case, it's used to create a new array with all elements from the original `params` array.

**Pros and Cons of Each Approach**

Here are some general pros and cons for each approach:

1. **Push**: Pros:
	* Simple and straightforward.
	* Fast execution.
	Cons:
	* Can lead to slower performance if the array is large, since it involves creating a new array copy.
2. **Concat**: Pros:
	* Allows for more flexibility in adding elements to the array.
	* Can be faster than `push()` for large arrays.
Cons:
	* Creates a new array, which can be expensive in terms of memory allocation and garbage collection.
3. **Decon**: Pros:
	* Fast execution since it avoids creating an intermediate array copy.
Cons:
	* Requires modern JavaScript features (ES6+) and may not work in older browsers or environments.

**Alternatives**

Some alternative approaches to these three methods include:

1. **Array.prototype.push()`: Instead of using the `push()` method, you could use `Array.prototype.push()` directly on the original array.
2. **Array.from()**: You could use `Array.from()` to create a new array from the original array, including the new element added with `push()` or `concat()`.
3. **Array.slice()`: Another approach is to use `Array.slice()` to extract a subset of elements from the original array and then add the new element using one of the above methods.

Keep in mind that these alternatives may have different performance characteristics, memory usage, or compatibility issues with older browsers or environments.

Latest run results:

Run details: (Test run date: 9 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36 Edg/121.0.0.0

Browser/OS: Chrome 121 on Windows

View result in a separate tab

Test name	Executions per second
Decon	33878876.0 Ops/sec
Push	50160440.0 Ops/sec
Concat	8955206.0 Ops/sec
Index	50240244.0 Ops/sec

Related benchmarks:

Push vs concat vs decon (version: 0)

Comparing performance of: Decon vs Push vs Concat vs Index

Created: 9 months ago by: Guest

Jump to the latest result

Decon

Push

Concat

Index

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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