Benchmark: concat vs lodash.concat vs array spread 4.17.21

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js'></script>

Tests:

Array.prototype.concat
var params = [ "hello", "hello", "sname" ]; var other = [ "red", "wine" ].concat(params);
Lodash concat
var params = [ "hello", "hello", "sname" ]; var other = _.concat([ "red", "wine" ], params);
Array spread
var params = [ "hello", "hello", "sname" ]; var other = [ "red", "wine", ...params ];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
Lodash concat
Array spread

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 definition and explain what is being tested.

**Benchmark Definition**

The website provides a JSON object that defines a benchmark, which consists of three test cases: `Array.prototype.concat`, `Lodash concat`, and `Array spread`. The benchmark is designed to compare the performance of these three approaches in concatenating arrays.

**Test Case 1: Array.prototype.concat**

This test case uses the built-in JavaScript method `Array.prototype.concat()` to concatenate an array with another array. The code snippet provided:
```javascript
var params = [ "hello", "hello", "sname" ];
var other = [ "red", "wine" ].concat(params);
```
**Test Case 2: Lodash concat**

This test case uses the `_.concat()` function from the Lodash library to concatenate an array with another array. The code snippet provided:
```javascript
var params = [ "hello", "hello", "sname" ];
var other = _.concat([ "red", "wine" ], params);
```
**Test Case 3: Array spread**

This test case uses the syntax `Array spread` (also known as rest parameter) to concatenate an array with another array. The code snippet provided:
```javascript
var params = [ "hello", "hello", "sname" ];
var other = [ "red", "wine", ...params ];
```
**Options Compared**

The benchmark compares the performance of three approaches:

1. `Array.prototype.concat()`: uses the built-in JavaScript method to concatenate arrays.
2. `Lodash concat`: uses the `_.concat()` function from the Lodash library to concatenate arrays.
3. `Array spread`: uses the syntax `Array spread` to concatenate arrays.

**Pros and Cons**

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

* **Array.prototype.concat()**:
	+ Pros: widely supported, efficient in most cases.
	+ Cons: can be slower than other approaches for large arrays or when using strict mode.
* **Lodash concat**:
	+ Pros: widely used, well-maintained library, easy to use.
	+ Cons: adds an extra dependency, may not be as efficient as native methods.
* **Array spread**:
	+ Pros: concise and expressive syntax, efficient in most cases.
	+ Cons: only supported in modern browsers (>= Chrome 49) and Node.js 10+, may not work in older browsers or environments.

**Library**

The Lodash library is a popular utility belt for functional programming in JavaScript. It provides a wide range of functions for tasks such as array manipulation, object manipulation, and more.

**Special JS Feature/Syntax**

None mentioned in the provided benchmark definition. However, note that the `Array spread` syntax (e.g., `[ ...params ]`) is a relatively new feature introduced in ECMAScript 2015 (ES6).

**Alternatives**

Other alternatives for concatenating arrays include:

* Using the `Array.prototype.push()` method to add elements to an array and then creating a new array using `Array.from()`.
* Using a library like Immutable.js, which provides a more functional programming approach to data manipulation.
* Implementing a custom implementation of array concatenation using loops or other techniques.

Keep in mind that the best approach for concatenating arrays depends on the specific use case and performance requirements.

Related benchmarks:

concat vs lodash.concat vs array spread 4.17.21 (version: 0)

Comparing performance of: Array.prototype.concat vs Lodash concat vs Array spread

Created: 5 years ago by: Guest

Jump to the latest result

Array.prototype.concat

Lodash concat

Array spread

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):