Benchmark: lodash fisrt and rest vs spread

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

const names = ["first", "middle", "last", "suffix"]

Tests:

lodash
const names = ["first", "middle", "last", "suffix"] const firstName = _.first(names) const otherNames = _.rest(function(x){return x;})
spread
const names = ["first", "middle", "last", "suffix"] const [firstName, ...otherNames] = names

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash
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.

The provided JSON represents a JavaScript microbenchmark that compares two approaches: using Lodash's `first` and `rest` functions, and using array destructuring with spread syntax.

**Lodash's `first` and `rest` functions**

Lodash is a popular utility library for JavaScript. The `first` function takes an array as input and returns the first element of the array. The `rest` function takes two arguments: a function to be applied to each element, and the original array. It applies the function to each element and returns a new array containing the results.

In the benchmark definition code:
```javascript
const names = [\"first\", \"middle\", \"last\", \"suffix\"];
const firstName = _.first(names); // Lodash's first function
const otherNames = _.rest(function(x){return x;}) (names); // Lodash's rest function
```
The `rest` function is used to create a new array containing all elements of the original array except for the first one.

**Array destructuring with spread syntax**

This approach uses the spread syntax (`...`) to destructure the array and extract its elements. The syntax looks like this:
```javascript
const names = [\"first\", \"middle\", \"last\", \"suffix\"];
const [firstName, ...otherNames] = names; // Array destructuring with spread syntax
```
In this example, `firstName` is assigned the first element of the array (`"first"`), and `otherNames` is assigned an array containing all elements except for the first one (`["middle", "last", "suffix"]`).

**Comparison**

The benchmark compares the execution times of these two approaches on a sample dataset.

**Pros and cons of each approach:**

* Lodash's `first` and `rest` functions:
	+ Pros:
		- More readable code, as it explicitly shows the intention of extracting the first element.
		- Can be more efficient if the original array is large, since only one pass over the elements is required.
	+ Cons:
		- Requires Lodash library, which may add overhead to the benchmark.
		- May not be suitable for small arrays or datasets where simplicity is prioritized.
* Array destructuring with spread syntax:
	+ Pros:
		- Simple and concise code that directly expresses the intent of extracting elements from an array.
		- Does not require any external libraries, making it a lightweight option.
	+ Cons:
		- May be less efficient for large datasets due to the overhead of deconstruction.

**Considerations:**

* The choice between these approaches depends on the specific use case and performance requirements. If simplicity is more important than raw speed, array destructuring with spread syntax might be preferred. However, if readability and efficiency are crucial, Lodash's `first` and `rest` functions might be a better fit.
* It's worth noting that modern JavaScript engines have optimized array manipulation and deconstruction mechanisms, so the performance difference between these approaches is likely to be small.

**Alternatives:**

Other ways to extract the first element of an array without using Lodash or array destructuring are:

* `slice()` method: `names.slice(0, 1)` (slightly slower than Lodash's approach)
* Manual indexing: `names[0]` (very slow and less readable)
* Other libraries like `Array.prototype.shift()` or `Array.prototype.pop()`, which have different use cases but can achieve similar results.

Keep in mind that these alternatives may not offer the same level of performance, readability, or convenience as Lodash's `first` function or array destructuring with spread syntax.

Related benchmarks:

lodash fisrt and rest vs spread (version: 0)

.

Comparing performance of: lodash vs spread

Created: 4 years ago by: Registered User

Jump to the latest result

lodash

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):