Benchmark: Object literal vs Object.create(null) reading

Tests:

Object.create(null) props
const o = Object.create(null) o.x = 'a string' o.y = 17 o.z = { m: 'an object', n: 97 } const a = []; for (let i = 0; i < 10000; i++) { a.push( o.x ) a.push( o.y ) a.push( o.z ) }
object literal props
const o = { x: 'a string' } o.y = 17 o.z = { m: 'an object', n: 97 } const a = []; for (let i = 0; i < 10000; i++) { a.push( o.x ) a.push( o.y ) a.push( o.z ) }
Object.create(null) iteration
const o = Object.create(null) o.x = 'a string' o.y = 17 o.z = { m: 'an object', n: 97 } const a = []; for (let i = 0; i < 10000; i++) { for (let k in o) { a.push(o[k]); } }
object literal iteration
const o = { x: 'a string' } o.y = 17 o.z = { m: 'an object', n: 97 } const a = []; for (let i = 0; i < 10000; i++) { for (let k in o) { a.push(o[k]); } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.create(null) props
object literal props
Object.create(null) iteration
object literal iteration

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

Browser/OS: Chrome 114 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Object.create(null) props	4818.7 Ops/sec
object literal props	13866.0 Ops/sec
Object.create(null) iteration	1170.0 Ops/sec
object literal iteration	7613.9 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring the performance of JavaScript objects created with `Object literal` vs `Object.create(null)` is an interesting benchmark.

**What's being tested:**

The benchmark compares the performance of two approaches to create non-empty objects:

1. **Object literal**: Creating an object using the `{}` syntax, like `const o = { x: 'a string', y: 17, z: { m: 'an object', n: 97 } }`.
2. **Object.create(null)**: Creating an object using the `Object.create(null)` method, like `const o = Object.create(null); o.x = 'a string'; o.y = 17; o.z = { m: 'an object', n: 97 };`.

**Options compared:**

The benchmark compares the performance of:

* **Iteration**: Using a `for...in` loop to iterate over the object's properties and push them into an array.
* **Property access**: Directly accessing the object's properties using dot notation (e.g., `o.x`, `o.y`, `o.z`) and pushing them into an array.

**Pros and cons of each approach:**

1. **Object literal**:
	* Pros:
		+ More readable and concise syntax.
		+ Faster execution, since the object is created in a single statement.
	* Cons:
		+ May incur a performance overhead due to the parsing and evaluation of the object literal syntax.
2. **Object.create(null)**:
	* Pros:
		+ Can be faster, since it avoids the parsing and evaluation overhead of the object literal syntax.
	* Cons:
		+ Requires more code to create and initialize the object's properties.
		+ May have a higher memory footprint due to the creation of an additional object.

**Library usage:**

None of the benchmark definitions explicitly use any JavaScript libraries or frameworks. However, it's worth noting that some browsers may include internal libraries that can impact performance (e.g., the `V8` engine used in Chrome).

**Special JS features or syntax:**

No special JS features or syntax are mentioned in the benchmark definitions.

**Other considerations:**

The benchmark focuses on the performance of creating and iterating over objects, which is an important aspect of JavaScript programming. However, it's essential to consider other factors that can impact performance, such as:

* Memory allocation and deallocation
* Garbage collection overhead
* Optimizations enabled by the browser or JavaScript engine

**Alternative approaches:**

Other alternatives for measuring object creation performance might include:

* Using a different data structure, such as an array or a Map.
* Measuring the performance of creating objects with more complex structures (e.g., nested objects).
* Comparing the performance of different JavaScript engines or runtimes.
* Including additional factors that can impact performance, such as concurrent execution or network latency.

Related benchmarks:

Object literal vs Object.create(null) reading (version: 0)

compare performance of object reading, created non-empty objects using object literal vs Object.create

Comparing performance of: Object.create(null) props vs object literal props vs Object.create(null) iteration vs object literal iteration

Created: one year ago by: Registered User

Jump to the latest result

Object.create(null) props

object literal props

Object.create(null) iteration

object literal iteration

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):