Benchmark: lodash assign vs object.assign vs spread asdfdsfasdfdsfdddd

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: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = _.merge(a, b);
object.assign
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = Object.assign(a, b);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash merge
object.assign

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.118 Safari/537.36

Browser/OS: Chrome 80 on Linux

View result in a separate tab

Test name	Executions per second
lodash merge	1073942.6 Ops/sec
object.assign	2304804.5 Ops/sec

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided JSON represents a JavaScript microbenchmark that compares three approaches for object assignment while keeping references to the source: `lodash.assign`, `Object.assign`, and spread syntax (`{ ... }`).

**Approaches Compared**

1. **Lodash's `assign` function**: This is a utility function from the Lodash library, which provides a convenient way to merge objects.
2. **JavaScript's built-in `Object.assign` method**: This method allows assigning properties of one or more source objects to a target object.
3. **Spread syntax (`{ ... }`)**: This is a shorthand way to create a new object by copying the key-value pairs from an existing object.

**Pros and Cons of Each Approach**

1. **Lodash's `assign` function**:
	* Pros: Convenient, readable code; handles nested objects; can be easily customized.
	* Cons: Requires an external library (Lodash); may have a performance overhead due to the additional function call.
2. **JavaScript's built-in `Object.assign` method**:
	* Pros: Fast and lightweight; part of the standard JavaScript API; no additional dependencies required.
	* Cons: Less readable code than Lodash's `assign` function; only works with objects, not arrays or other data structures.
3. **Spread syntax (`{ ... }`)**:
	* Pros: Simple and concise code; fast and efficient; works with objects, arrays, and other data structures.
	* Cons: Limited support for nested objects; may require additional manual configuration.

**Library and its Purpose**

The `lodash` library is a popular JavaScript utility library that provides a wide range of useful functions for tasks such as array manipulation, string manipulation, and object manipulation. In this benchmark, `lodash.assign` is used to compare with the built-in `Object.assign` method and spread syntax.

**Special JS Feature/Syntax**

The benchmark uses the spread syntax (`{ ... }`) to create a new object by copying key-value pairs from an existing object. This syntax was introduced in ECMAScript 2015 (ES6) as a shorthand way to create objects.

**Other Alternatives**

If you prefer not to use `lodash.assign` or the spread syntax, you can also use other approaches such as:

* Using the `for...in` loop and manually copying properties from one object to another.
* Using the `JSON.parse(JSON.stringify(obj))` trick (although this has some performance implications).
* Creating a new object using the `Object.create()` method and then assigning properties to it.

Related benchmarks:

lodash assign vs object.assign vs spread asdfdsfasdfdsfdddd (version: 0)

testing object assignment while keeping references to source

Comparing performance of: lodash merge vs object.assign

Created: 4 years ago by: Guest

Jump to the latest result

lodash merge

object.assign

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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