Benchmark: concat vs lodash.concat vs array spread

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/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 benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark is designed to compare the performance of three approaches:

1. `Array.prototype.concat()`
2. `_concat()` from the Lodash library
3. Array spread (`...` operator)

These approaches are used to concatenate two arrays, `params` and `[ "red", "wine" ]`.

**Options Compared**

Here's a brief summary of each approach:

1. **Array.prototype.concat()**: This method is a built-in method in JavaScript that concatenates two arrays. It creates a new array and copies the elements from both arrays to it.
2. **_concat()` from Lodash library**: This function is part of the Lodash utility belt, which provides a set of functional programming helpers. The `_concat()` function takes multiple arrays as arguments and returns a new concatenated array.
3. **Array spread (`...` operator)**: This operator allows you to extract elements from an array and use them in another context, such as concatenating two arrays.

**Pros and Cons**

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

1. **Array.prototype.concat()**:
	* Pros: Simple, widely supported.
	* Cons: Creates a new array, which can be inefficient for large datasets.
2. **_concat()` from Lodash library**:
	* Pros: More efficient than `Array.prototype.concat()` since it avoids creating a new array.
	* Cons: Requires the Lodash library to be included in your project.
3. **Array spread (`...` operator)**:
	* Pros: Very concise and expressive, creates a new array with the desired elements.
	* Cons: Limited support for older browsers (IE11+), requires JavaScript version 15.5 or later.

**Library Used**

The benchmark uses the Lodash library, which provides a set of utility functions that make functional programming easier to write in JavaScript.

**Special JS Feature or Syntax**

There is no special JavaScript feature or syntax used in this benchmark beyond what's inherent to the three approaches being compared.

**Other Alternatives**

If you're looking for alternative approaches, here are a few:

1. **`Array.prototype.push()`**: Instead of concatenating two arrays, you can use `push()` to add elements to one array.
2. **`Set` data structure**: If you need to remove duplicates from an array before concatenating it with another array, using a `Set` data structure might be more efficient.

Keep in mind that these alternatives may have different performance characteristics or trade-offs depending on your specific use case.

Related benchmarks:

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

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

Created: 6 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):