Benchmark: Object.keys vs lodash _.keys const assignment

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/lodash/4.16.0/lodash.min.js"></script>

Script Preparation code:

var value = {a: 30310, b: '100303', c: '3040494'}

Tests:

_.keys
const ldKeys = _.keys(value)
native
const nativeKeys = Object.keys(value)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.keys
native

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.

**Overview**
The benchmark compares two approaches to get an array of keys from an object: using `Object.keys()` (native JavaScript method) versus using Lodash's `_.keys()` function with constant assignment (`const ldKeys = _.keys(value)`).

**Options compared**

1. **Native `Object.keys()`**: This is the built-in JavaScript method that returns an array of strings representing the keys of an object.
2. **Lodash's `_.keys()` with constant assignment**: Lodash is a utility library for functional programming in JavaScript. The `_` prefix refers to the root namespace, and `_.keys()` is a function that returns an array of keys from an object.

**Pros and cons**

* **Native `Object.keys()`:**
	+ Pros:
		- Faster execution times since it's a built-in method.
		- More efficient use of memory, as it doesn't require creating an extra array.
	+ Cons:
		- May not work correctly with certain data types or edge cases (e.g., objects with sparse properties).
* **Lodash's `_.keys()` with constant assignment:**
	+ Pros:
		- Works consistently across different JavaScript environments and versions.
		- Provides a more explicit way to get the keys of an object, which can be useful for code readability.
	+ Cons:
		- Requires loading Lodash as a dependency, which can add extra overhead.
		- May incur slower execution times due to the additional function call.

**Library and syntax**
In this benchmark, Lodash is used with constant assignment (`const ldKeys = _.keys(value)`). This means that the `_.keys()` function is called once before the test starts, and the result is stored in a constant variable. This approach can help reduce overhead by minimizing the number of times the function needs to be executed.

**Other considerations**

* **ES version support**: Both native `Object.keys()` and Lodash's `_.keys()` should work across different ES versions (ECMAScript standards). However, it's essential to test for specific features or edge cases that might break compatibility.
* **Browser differences**: As shown in the benchmark result, browser-specific differences may impact performance. For example, Chrome 86 on Windows has a significantly faster execution rate than Lodash's `_.keys()`.

**Alternatives**

If you're looking for alternative approaches to get an array of keys from an object, consider:

* **`for...in` loop**: A common approach that iterates over the object's properties using a `for...in` loop.
* **`Array.from()` method**: Can be used with `Object.keys()` or other methods to create an array from an iterable (like an object).
* **`Promise.all()` method**: Can be used to get multiple values from an iterable, including keys, in a single operation.

Keep in mind that each alternative has its own trade-offs and potential performance implications.

Related benchmarks:

Object.keys vs lodash _.keys const assignment (version: 0)

Comparing performance of: _.keys vs native

Created: 5 years ago by: Guest

Jump to the latest result

_.keys

native

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):