Benchmark: 1c123easd - MeasureThat.net

HTML Preparation code:

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

Tests:

lodash merge
var a = { a: {title: 'abrams', type: 'carrier'}, b: {title: 'USS Niphilim', type: 'Carrier' }}; var b = { b: {title: 'USS Nimitz', type: 'Carrier' } }; var c = _.merge(a, b);
object.assign
var a = { a: {title: 'abrams', type: 'carrier'}, b: {title: 'USS Niphilim', type: 'Carrier' }}; var b = { b: {title: 'USS Nimitz', type: 'Carrier' } }; var c = Object.assign(a, b);
spread
var a = { a: {title: 'abrams', type: 'carrier'}, b: {title: 'USS Niphilim', type: 'Carrier' }}; var b = { b: {title: 'USS Nimitz', type: 'Carrier' } }; var c = { ...a, ...b };

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash merge
object.assign
spread

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0

Browser/OS: Firefox 91 on Ubuntu

View result in a separate tab

Test name	Executions per second
lodash merge	597309.8 Ops/sec
object.assign	7161673.5 Ops/sec
spread	3097939.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**Overview**

The benchmark is designed to test the performance of three different ways to merge two objects: `Object.assign()`, spread operator (`{ ... }`), and Lodash's `merge()` function. The benchmark compares these approaches to determine which one is the fastest.

**Test Cases**

Each test case consists of a script that defines two objects, `a` and `b`, and then calls either `Object.assign()`, spread operator, or Lodash's `merge()` function to merge these two objects into a new object `c`. The scripts are identical in terms of the input data, but differ only in how they perform the merging.

**Options Compared**

The three options compared in this benchmark are:

1. **`Object.assign()`**: This method takes two or more source objects and merges them into one destination object.
2. **Spread Operator (`{ ... }`)**: This operator creates a new object by spreading the properties of an existing object.
3. **Lodash's `merge()` function**: This function merges two objects into one, handling various edge cases such as overwriting existing keys.

**Pros and Cons**

Here are some pros and cons for each approach:

1. **`Object.assign()`**:
	* Pros: Simple, widely supported, and fast.
	* Cons: Can be slower than other approaches if the source objects have a large number of properties or deep structures.
2. **Spread Operator (`{ ... }`)**:
	* Pros: Fast, concise, and easy to read.
	* Cons: Only works in modern browsers that support ES6+ syntax. May not work in older browsers or environments with restricted features.
3. **Lodash's `merge()` function**:
	* Pros: Handles various edge cases such as overwriting existing keys, merging objects with circular references, and more.
	* Cons: Requires Lodash library to be included in the test script.

**Library and Syntax**

The benchmark uses the following libraries:

1. **Lodash**: A popular utility library that provides a `merge()` function for merging objects.
2. **Spread Operator (`{ ... }`)**: A modern JavaScript syntax for creating new objects from existing ones.

No special JavaScript features or syntax are used in this benchmark, making it accessible to a wide range of developers.

**Other Alternatives**

If you're looking for alternative approaches to merge two objects, consider the following:

1. **Object.create() and Object.assign()**: This approach creates a new object using `Object.create()` and then merges properties from another object using `Object.assign()`.
2. **Array.prototype.reduce()**: You can use `reduce()` method on an array of key-value pairs to merge objects.
3. **For...in loop**: A traditional approach using a `for...in` loop to iterate over the source objects' properties and create a new object.

Keep in mind that these alternatives may not be as concise or efficient as the approaches tested in this benchmark.

Related benchmarks:

1c123easd (version: 0)

Comparing performance of: lodash merge vs object.assign vs spread

Created: 3 years ago by: Guest

Jump to the latest result

lodash merge

object.assign

spread

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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