Benchmark: Manual vs Object.assign

Tests:

Manual assign
const a = {}; a.b = 1; a.c = 1; a.d = 1; a.e = 1; a.f = 1; a.g = 1; a.h = 1; a.i = 1;
Object.assign
const a = {}; Object.assign(a, { b: 1, c: 1, d: 1, e: 1, f: 1, g: 1, h: 1, i: 1 });
Direct
const a = { b: 1, c: 1, d: 1, e: 1, f: 1, g: 1, h: 1, i: 1 };

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Manual assign
Object.assign
Direct

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36

Browser/OS: Chrome 110 on Windows

View result in a separate tab

Test name	Executions per second
Manual assign	1149072128.0 Ops/sec
Object.assign	5930204.5 Ops/sec
Direct	1161459840.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided benchmark measures the performance difference between three approaches in JavaScript: manual assignment, `Object.assign()`, and direct object literal creation.

**Approaches Compared**

1. **Manual Assignment**: This approach involves manually assigning values to each property of an object using dot notation (e.g., `a.b = 1;`).
2. **Object.assign()**: This approach uses the `Object.assign()` method to assign properties from one or more source objects to a target object.
3. **Direct Object Literal Creation**: This approach involves creating an object literal with all properties assigned at once (e.g., `{ b: 1, c: 1, ... }`).

**Pros and Cons of Each Approach**

1. **Manual Assignment**:
	* Pros: Simple to understand and implement, no additional libraries required.
	* Cons: Inefficient due to repeated property accesses and assignments, may lead to performance issues in large codebases.
2. **Object.assign()**:
	* Pros: Efficient and concise, eliminates the need for manual loop or iteration.
	* Cons: Requires the `Object` object and its methods to be available, which might not be present in all environments (e.g., older browsers).
3. **Direct Object Literal Creation**:
	* Pros: Concise and readable, avoids unnecessary iterations and assignments.
	* Cons: May require additional memory for creating a temporary object if not executed immediately.

**Libraries Used**

None are explicitly mentioned in the provided benchmark definition or test cases. However, `Object.assign()` relies on the `Object` object, which is a built-in JavaScript object.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax used in this benchmark that would require additional explanation.

**Other Alternatives**

For more efficient property assignment methods:

1. **Array.prototype.forEach()**: Assigning properties to an array using `forEach()` can provide better performance and readability than manual loops.
2. **Object.create() + Object.assign()**: Creating a new object using `Object.create()` and then assigning properties using `Object.assign()` can be more efficient than manual assignment.

Keep in mind that the best approach depends on your specific use case, codebase size, and performance requirements.

Related benchmarks:

Manual vs Object.assign (version: 0)

Comparing performance of: Manual assign vs Object.assign vs Direct

Created: one year ago by: Registered User

Jump to the latest result

Manual assign

Object.assign

Direct

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):