Benchmark: Object.assign vs direct assignmentezaeazezaeza

Script Preparation code:

var data = {};

Tests:

Direct Assignment
for(var i = 0; i < 100000; i++) { data[`prop_${i}`] = true; }
Object.assign
for(var i = 0; i < 100000; i++) { var propName = `prop_${i}`; Object.assign(data, { [propName]: true }); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Direct Assignment
Object.assign

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the provided benchmark.

**Benchmark Definition:**
The benchmark is comparing two approaches to assigning properties to an object in JavaScript:

1. Direct Assignment (`var data = {}; data[prop_i] = true;`)
2. Using `Object.assign()` with bracket notation (`Object.assign(data, { [propName]: true });`)

**Options Compared:**

* Direct assignment of individual properties
* Using `Object.assign()` to assign multiple properties at once

**Pros and Cons:**

* **Direct Assignment:**
	+ Pros:
		- Simple and easy to read/understand
		- No dependency on the `Object.assign()` method
	+ Cons:
		- Can be slower due to repeated property assignments (100,000 iterations)
		- May lead to more memory allocations if the object is large
* **Object.assign():**
	+ Pros:
		- More concise and efficient for assigning multiple properties at once
		- Reduces memory allocations compared to direct assignment
	+ Cons:
		- Less readable/maintainable due to bracket notation and method call

**Library Usage:**

In this benchmark, `Object.assign()` is used from the built-in JavaScript library. Its purpose is to copy all enumerable own properties of a specified source object to a target object.

**Special JS Features/Syntax:**

There are no special features or syntax used in these test cases.

**Other Considerations:**

* The benchmark uses a fixed number of iterations (100,000) for both approaches.
* The `Data` object is initialized as an empty object (`var data = {};`) before each iteration.
* The test case does not account for any potential side effects or optimizations that may occur in the actual code.

**Alternatives:**

Other alternatives to direct assignment and `Object.assign()` include:

* Using `Object.create()`, which creates a new object based on an existing one, and then assigning properties using bracket notation.
* Utilizing `Array.prototype.fill()` method, which can be used to assign multiple values in an array-like object.

However, these alternatives are not considered in this specific benchmark.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Safari/537.36

Browser/OS: Chrome 117 on Linux

View result in a separate tab

Test name	Executions per second
Direct Assignment	5.7 Ops/sec
Object.assign	1.6 Ops/sec

Related benchmarks:

Object.assign vs direct assignmentezaeazezaeza (version: 0)

Comparing performance of: Direct Assignment vs Object.assign

Created: one year ago by: Guest

Jump to the latest result

Direct Assignment

Object.assign

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):