Benchmark: lodash.keys vs Object.keys with a large object

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js'></script>

Script Preparation code:

var objectMap = {};

for(var i=0; i<800000; i++){
  objectMap[i] = {
    a: Math.random(),
    b: Math.random()
  };
}

Tests:

lodash.keys
_.keys(objectMap)
native
Object.keys(objectMap)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash.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):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

The provided benchmark definition json represents two test cases that compare the performance of `_.keys` from the Lodash library with the native `Object.keys` method in JavaScript.

**What is tested:**

In this benchmark, we're testing the speed of:

1. **Native Object.keys**: This is the built-in method for getting an array of a given object's own enumerable property names.
2. **Lodash keys (_.keys)**: This function is part of the Lodash library and returns an array of a given object's own enumerable property names.

**Options compared:**

The two options being compared are:

1. Using the native `Object.keys` method
2. Using the Lodash `_.keys` function

**Pros and Cons of each approach:**

1. **Native Object.keys**:
	* Pros:
		+ Built-in, no additional dependencies required.
		+ Likely to be highly optimized by JavaScript engines.
	* Cons:
		+ May require more memory accesses since it's an array method.
2. **Lodash _.keys**:
	* Pros:
		+ May be more efficient than native `Object.keys` for very large objects due to optimized implementation.
		+ Reduces the need for manual property iteration.
	* Cons:
		+ Requires including the Lodash library, which adds a dependency.

**Library and purpose:**

Lodash is a popular JavaScript utility library that provides a set of functional programming helpers. The `_.keys` function returns an array of a given object's own enumerable property names. In this benchmark, Lodash _.keys is used to compare its performance with the native `Object.keys` method.

**Special JS feature or syntax:**

None mentioned in this specific benchmark definition.

**Other alternatives:**

If you're looking for alternative methods to get an array of a given object's own enumerable property names, you could consider:

1. **for...in**: A traditional loop-based approach that iterates over the object's properties using `in`.
2. **Object.getOwnPropertyNames()**: Returns an array of all properties (including non-enumerable ones) of an object.
3. **Reflect.ownKeys()**: A modern JavaScript method (introduced in ECMAScript 2018) that returns an array of an object's own property names.

Keep in mind that these alternatives may have different performance characteristics and use cases compared to the native `Object.keys` or Lodash _.keys methods.

Related benchmarks:

lodash.keys vs Object.keys with a large object (version: 1)

Comparing performance of: lodash.keys vs native

Created: 7 years ago by: Registered User

Jump to the latest result

lodash.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):