Benchmark: benchmark: spread vs concat vs push

Script Preparation code:

var a = [ "a", "b", "c" ];
var b = ["d", "e", "f"];

Tests:

concat
var res = a.concat(b);
spread
var res = [...a, ...b];
push
var ln = a.push(...b);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
concat
spread
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):

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark and explain what's being tested, compared options, pros and cons of each approach, library usage, special JS features or syntax, and alternative approaches.

**Benchmark Definition**

The benchmark is defined in JSON format, which includes:

* `Name`: a unique identifier for the benchmark (in this case, "benchmark: spread vs concat vs push").
* `Description`: no description provided.
* `Script Preparation Code`: JavaScript code that prepares the environment for the benchmark. In this case, two arrays `a` and `b` are created with different values.
* `Html Preparation Code`: no HTML preparation code is required.

**Individual Test Cases**

The test cases are defined as an array of objects, each representing a single test scenario:

* `Benchmark Definition`: a JavaScript statement that defines the benchmark. In this case, three tests are defined:
	+ `concat`: concatenates two arrays using the `concat()` method.
	+ `spread`: uses the spread operator (`...`) to concatenate two arrays.
	+ `push`: pushes elements from one array onto another using the `push()` method with the spread operator.

**Options Compared**

The benchmark compares three different ways of concatenating two arrays:

1. **`concat()`**: a traditional method for concatenating arrays, which creates a new array by combining the two input arrays.
2. **Spread Operator (`...`)**: a modern syntax introduced in ECMAScript 2015 (ES6), which allows for concise and expressive way of creating new arrays by spreading elements from existing arrays.
3. **`push()`** with spread operator: a variation of the `push()` method that uses the spread operator to concatenate elements from one array onto another.

**Pros and Cons of Each Approach**

Here's a brief summary:

* **`concat()`**: widely supported, easy to read, but creates a new array, which can lead to performance issues if arrays are large.
	+ Pros: simple, readable, widely supported.
	+ Cons: creates new array, potentially slow for large datasets.
* **Spread Operator (`...`)**: modern syntax, concise, and efficient. However, it may not be as readable or intuitive for some developers.
	+ Pros: concise, efficient, modern syntax.
	+ Cons: may not be readable by all developers, requires ES6 support.
* **`push()`** with spread operator: a variation that combines the benefits of both `concat()` and spread operator. It's more concise than using two separate methods but still creates a new array.
	+ Pros: concise, efficient, similar to spread operator syntax.
	+ Cons: may not be as readable or intuitive as `concat()`, requires ES6 support.

**Library Usage**

None of the benchmark test cases use external libraries. The script preparation code defines two arrays `a` and `b`, which are used in each test case.

**Special JS Features or Syntax**

The benchmark uses the following special JavaScript features:

* Spread operator (`...`) introduced in ECMAScript 2015 (ES6).
* No other advanced syntax is used in this benchmark, making it accessible to a wide range of developers.

**Alternative Approaches**

Other approaches for concatenating arrays include:

* Using the `Array.prototype.push()` method with multiple arguments: `a.push(...b)`, which achieves similar performance to using spread operators.
* Using a custom loop or function to concatenate elements from one array onto another.
* Using libraries like Lodash or Underscore.js, which provide utility functions for concatenating arrays.

However, these alternative approaches may not be as concise or efficient as the spread operator syntax and are generally less readable.

Related benchmarks:

benchmark: spread vs concat vs push (version: 0)

Comparing performance of: concat vs spread vs push

Created: 4 years ago by: Guest

Jump to the latest result

concat

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):