Benchmark: object assign vs direct assignment

Tests:

direct assignment
const obj = { name: 'Japan' }; const names = [ { name: 'Japan', from: '2017-09-09T09:00:32Z', to: '' }, { name: 'Japannnnn', from: '2015-01-13T14:11:43Z', to: '2017-09-09T09:00:32Z' }, { name: 'Japannnnn', from: '', to: '2015-01-13T14:11:43Z' } ]; obj.names = names;
obj.assign
const obj = { name: 'Japan' }; const names = [ { name: 'Japan', from: '2017-09-09T09:00:32Z', to: '' }, { name: 'Japannnnn', from: '2015-01-13T14:11:43Z', to: '2017-09-09T09:00:32Z' }, { name: 'Japannnnn', from: '', to: '2015-01-13T14:11:43Z' } ]; Object.assign(obj, { names });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
direct assignment
obj.assign

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

**What is being tested?**

The provided benchmark tests the performance difference between two approaches for assigning an object to another object in JavaScript:

1. **Direct Assignment**: Assigning the `names` array directly to the `obj.names` property using the assignment operator (`=`).
2. **Using Object.assign()**: Using the `Object.assign()` method to copy the properties of the `names` array to the `obj.names` property.

**Options compared**

The benchmark compares these two approaches:

* Direct Assignment (`obj.names = names;`)
* Using `Object.assign()` (`Object.assign(obj, { names });`)

**Pros and Cons of each approach:**

1. **Direct Assignment**:
	* Pros:
		+ Simple and concise syntax.
		+ No need to import any additional modules (e.g., `Object.assign()`).
	* Cons:
		+ May be slower due to the overhead of creating a new array reference in the `obj.names` property.
		+ Can lead to unexpected behavior if the assignment is not properly handled (e.g., if `names` is a mutable object and modifying it affects `obj.names`).
2. **Using Object.assign()**:
	* Pros:
		+ More explicit and readable syntax, as it clearly communicates the intention of copying properties from one object to another.
		+ Can be more efficient than direct assignment for large objects, as it avoids creating unnecessary array references.
	* Cons:
		+ Requires importing the `Object.assign()` method (if not already available via a transpiler or bundler).
		+ May have performance overhead due to the function call and parameter passing.

**Library usage**

The benchmark uses the `Object.assign()` method, which is a standard JavaScript method for copying properties from one object to another. It is part of the ECMAScript 2015 (ES6) specification and has been widely adopted by modern browsers and Node.js implementations.

**Special JS feature or syntax**

There are no special features or syntax used in this benchmark that require specific knowledge or expertise beyond basic JavaScript programming concepts.

**Alternatives**

Other alternatives for achieving similar results to direct assignment include:

* Using the spread operator (`{ ...obj }`) to create a new object with the same properties as `obj`, and then assigning the resulting object to `obj.names`.
* Using a library like Lodash (specifically, the `assignIn()` method) to achieve the desired behavior.
* Using a custom implementation of the assignment logic to optimize performance.

However, these alternatives may introduce additional complexity or dependencies that are not necessary for this specific benchmark.

Related benchmarks:

object assign vs direct assignment (version: 0)

Comparing performance of: direct assignment vs obj.assign

Created: 3 years ago by: Guest

Jump to the latest result

direct assignment

obj.assign

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):