Benchmark: Underscore _.keys

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js'></script>

Script Preparation code:

var o = {}
for(var i = 0; i < 101; i++) {
	o[i] = new Date()
}

Tests:

_.keys
_.keys(o)
Object.keys
Object.keys(o)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.keys
Object.keys

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.

Let's break down the provided JSON and explain what's being tested.

**Benchmark Definition**

The benchmark is comparing two functions: `_.keys(o)` from the Underscore.js library and `Object.keys(o)`. Both functions are designed to return an array of keys (property names) for a given object (`o`).

**Underscore.js Library**

Underscore.js is a popular JavaScript utility library that provides various functional programming helpers, such as array manipulation, string manipulation, and object manipulation. The `_.keys()` function returns an array of property names of the input object.

**Options Compared**

The benchmark compares two options:

1. **Underscore.js `_keys(o)`**: This implementation is provided by the Underscore.js library.
2. **Built-in JavaScript `Object.keys(o)`**: This implementation comes built into modern JavaScript engines.

**Pros and Cons**

### Underscore.js `_keys(o)`

Pros:

* Part of a well-established and widely used utility library, providing additional functionality beyond just key extraction.
* May be optimized for performance by the library authors.

Cons:

* Adds an external dependency on the Underscore.js library.
* May introduce additional overhead due to function call and parameter passing.

### Built-in JavaScript `Object.keys(o)`

Pros:

* No external dependencies, reducing the chance of introducing bugs or security vulnerabilities.
* Part of the standard JavaScript engine, making it more likely to be optimized for performance.

Cons:

* May not be as performant as a library-optimized implementation like Underscore.js.

**Other Considerations**

Both implementations are designed to return an array of keys (property names) for the input object. The benchmark measures the execution speed and other metrics to compare these two options.

If test users have deep knowledge of JavaScript, they might be interested in exploring performance optimization techniques or considering alternative libraries for key extraction.

**Alternative Implementations**

Other alternatives to consider include:

* `Array.prototype.keys()` (modern browsers): Some browsers support an experimental method to get array keys. This implementation is not as widely supported as the standard `Object.keys()` method.
* `JSON.parse(JSON.stringify(o)).slice(0, 1000).length` or other custom implementations using JavaScript's built-in functions and arrays.

Keep in mind that these alternatives might have different performance characteristics or use cases compared to `_.keys()` and `Object.keys()`.

Related benchmarks:

Underscore _.keys (version: 0)

Comparing performance of: _.keys vs Object.keys

Created: 5 years ago by: Guest

Jump to the latest result

_.keys

Object.keys

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):