Benchmark: Find and Tail (Vanilla JS vs Lodash)

HTML Preparation code:

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

Script Preparation code:

var names = ["first", "middle", "last", "suffix"];

Tests:

_.first
_.first(names);
_.tail
_.tail(names);
spread operator
[firstName, ...otherNames] = names;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.first
_.tail
spread operator

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36

Browser/OS: Chrome 145 on Linux

View result in a separate tab

Test name	Executions per second
_.first	142029504.0 Ops/sec
_.tail	78663504.0 Ops/sec
spread operator	4207014.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON data and explain what's being tested in this JavaScript microbenchmark.

**Benchmark Overview**

The benchmark is designed to compare the performance of two approaches: using Lodash's `first` function versus a vanilla JavaScript approach for finding the first element of an array. Additionally, it tests the spread operator (`...`) on an array.

**Lodash Library and Purpose**

Lodash is a popular utility library for JavaScript that provides a wide range of functions for tasks such as string manipulation, array manipulation, and more. The `first` function is part of this library and returns the first element of an array or string.

In this benchmark, Lodash's `first` function is used in two test cases: finding the first name in the `names` array and using the spread operator on an array.

**Vanilla JavaScript Approach**

The vanilla JavaScript approach uses basic arithmetic operations to achieve the same results as Lodash's `first` function. For example, if we want to find the index of the first element that is not equal to a certain value, we can use the following code:

```javascript
const index = names.indexOf(nameToFind);
if (index >= 0) {
    const result = [names[index], ...names.slice(index + 1)];
}
```

This approach requires more manual work and calculations compared to using Lodash's `first` function.

**Options Compared**

Two options are being compared in this benchmark:

1. **Lodash's `first` function**: This is the first option tested, which returns the first element of an array or string.
2. **Vanilla JavaScript Approach**: The second option tested uses basic arithmetic operations to achieve the same results as Lodash's `first` function.

**Pros and Cons**

Here are some pros and cons for each approach:

Lodash's `first` function:

Pros:

* Faster execution time, since it's optimized for performance
* Easier to use, especially for those familiar with functional programming

Cons:

* Requires an additional library (Lodash) to be included in the benchmark
* May not be suitable for all scenarios where manual calculations are required

Vanilla JavaScript Approach:

Pros:

* No external dependencies needed
* Allows for more control over the calculation process

Cons:

* Requires more manual work and calculations, which can lead to slower execution times
* May require additional processing power

**Spread Operator**

The spread operator (`...`) is used in the third test case to split an array into two parts. This option is not directly related to finding the first element of an array.

Pros:

* Allows for concise code and easier manipulation of arrays
* Can be more readable than traditional array manipulation methods

Cons:

* May have slower execution times due to the additional operations required
* Requires modern JavaScript support (ES6+)

**Other Alternatives**

If you're interested in exploring alternative approaches, here are a few options:

1. **Array.prototype.findIndex**: This method returns the index of the first element that satisfies the provided condition.
2. **Manual indexing**: You can use basic arithmetic operations to find the index of the desired element.

Keep in mind that each approach has its own strengths and weaknesses, and the choice of which one to use depends on your specific requirements and preferences.

Related benchmarks:

Find and Tail (Vanilla JS vs Lodash) (version: 0)

Comparing performance of: _.first vs _.tail vs spread operator

Created: 6 years ago by: Guest

Jump to the latest result

_.first

_.tail

spread operator

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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