Benchmark: assign after allocate object vs re-use object 2

Script Preparation code:

var reused = {
	color: [1, 1, 1, 1],
  	position: [1, 1],
};

var map = new Map();
for (let i = 0; i < 1000000; i += 1) {
	map.set(`${i}`, {
	  color: [1, 1, 1, 1],
	  position: [1, 1],
      size: 99, // dummy key
	});  
}

Tests:

allocate
for (let i = 0; i < 10000; i += 1) { const target = map.get(`${i}`); Object.assign(target, { color: [i, i, i, i], position: [i, i], }); }
reuse
for (let i = 0; i < 10000; i += 1) { const target = map.get(`${i}`); reused = { color: [i, i, i, i], position: [i, i], }; Object.assign(target, reused); }
without object.assign (allocate)
for (let i = 0; i < 10000; i += 1) { const target = map.get(`${i}`); const newObj = { color: [i, i, i, i], position: [i, i], }; target.color = newObj.color; target.position = newObj.position; }
without object.assign (re-used)
for (let i = 0; i < 10000; i += 1) { const target = map.get(`${i}`); reused = { color: [i, i, i, i], position: [i, i], }; target.color = reused.color; target.position = reused.position; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
allocate
reuse
without object.assign (allocate)
without object.assign (re-used)

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.3 Safari/605.1.15

Browser/OS: Safari 14 on Mac OS X 10.15.6

View result in a separate tab

Test name	Executions per second
allocate	442.1 Ops/sec
reuse	319.7 Ops/sec
without object.assign (allocate)	1052.9 Ops/sec
without object.assign (re-used)	433.1 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring the performance of different approaches to assign values to objects in JavaScript.

**What's being tested:**

The benchmark tests four different approaches to assign values to an object:

1. **Reusing the `reused` object**: Creating a single object with the desired colors and positions, and then reusing it to update multiple targets.
2. **Allocating a new object for each target**: Creating a new object for each target and assigning the desired colors and positions to it using `Object.assign`.
3. **Reusing an existing object without `Object.assign`**: Getting a reference to an existing object with the same structure, and then updating its properties by assigning new values.
4. **Without reusing any objects**: Creating a new object for each target and assigning the desired colors and positions directly to it.

**Options comparison:**

| Approach | Description |
| --- | --- |
| Reuse | Efficient, as only one object is created and reused across multiple targets. |
| Allocate | Inefficient, as 1 million objects are created, each with a copy of the original data. |
| No Assign | Less efficient than reuse, but still more efficient than allocate, since it avoids creating new objects. |
| Without Assign (Reuse) | Similar to reuse, but without using `Object.assign`, which might be beneficial for older browsers or specific use cases. |

**Pros and Cons:**

* **Reuse**: Pros - Efficient, reduces memory allocation. Cons - Limited flexibility if the object structure changes.
* **Allocate**: Pros - None. Cons - Creates 1 million objects, inefficient in terms of memory and performance.
* **No Assign**: Pros - Avoids creating new objects, potentially beneficial for older browsers or specific use cases. Cons - Less efficient than reuse.
* **Without Assign (Reuse)**: Similar to reuse, but without using `Object.assign`. This approach might be beneficial in certain scenarios.

**Library usage:**

The benchmark uses the `Map` data structure from the JavaScript Standard Library, which provides a way to store and retrieve key-value pairs efficiently. The `Map` object is used to create a large dataset of objects with unique keys.

**Special JS feature or syntax:**

None mentioned explicitly in the provided code or context. However, it's worth noting that the benchmark uses ES6+ features like arrow functions (`=>`) and template literals (`${i}`) for string interpolation.

**Alternatives:**

If you're looking for alternatives to this benchmark or want to explore other approaches, consider:

* Using a JavaScript profiler to analyze memory allocation and object creation patterns.
* Implementing a custom caching mechanism to optimize reusing objects.
* Investigating the performance impact of using different data structures (e.g., arrays, objects) instead of `Map`.
* Creating a benchmark for other aspects of JavaScript performance, such as parsing or garbage collection.

Related benchmarks:

assign after allocate object vs re-use object 2 (version: 0)

Comparing performance of: allocate vs reuse vs without object.assign (allocate) vs without object.assign (re-used)

Created: 3 years ago by: Registered User

Jump to the latest result

allocate

reuse

without object.assign (allocate)

without object.assign (re-used)

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):