Benchmark: assign vs direct

Script Preparation code:

var data = {};

Tests:

direct
for(let i = 0; i < 10000; i++) { data[`prop_${i}`] = true; }
assign
for(let i = 0; i < 10000; i++) { Object.assign(data, { [`prop_${i}`]: true }); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
direct
assign

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/125.0.0.0 Safari/537.36

Browser/OS: Chrome 125 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
direct	1114.8 Ops/sec
assign	279.4 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and analyze what's being tested.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark named "assign vs direct". The benchmark defines two test cases:

1. **"direct"**: This test case uses a simple loop to assign values to properties of an object `data`. The assignment is done using the dot notation (e.g., `data.prop_0 = true;`).
2. **"assign"**: This test case also uses a loop, but it uses the `Object.assign()` method to update the properties of the `data` object. Specifically, it assigns an object with key-value pairs (`{ [`prop_${i}`]: true }`) and then uses `Object.assign()` to merge this object into the existing `data` object.

**Options Compared**

The benchmark is comparing two approaches:

1. **Direct assignment**: Using the dot notation to assign values to properties of the `data` object.
2. **Assignment using Object.assign()**: Using the `Object.assign()` method to update the properties of the `data` object.

**Pros and Cons**

Here are some pros and cons of each approach:

* **Direct assignment**:
	+ Pros:
		- Can be more concise and readable for simple assignments.
		- May be faster since it doesn't create a new object or involve function calls.
	+ Cons:
		- May lead to memory leaks if not used carefully, as the properties are assigned on-the-fly without being explicitly deleted.
		- Can be less predictable in terms of performance, as the interpreter may optimize the assignment differently.
* **Assignment using Object.assign()**:
	+ Pros:
		- More explicit and predictable, as the operation is clearly defined by the `Object.assign()` method.
		- May help prevent memory leaks by ensuring properties are explicitly deleted.
	+ Cons:
		- Can be less concise and more verbose than direct assignment.
		- May incur a slight performance overhead due to the function call and object creation.

**Library Used**

There is no library used in this benchmark, as it only involves basic JavaScript operations (loops, object assignments).

**Special JS Features or Syntax**

This benchmark does not use any special JavaScript features or syntax beyond the standard `for` loop and property assignment. However, it's worth noting that the use of `Object.assign()` may be subject to changes in future JavaScript versions (e.g., with ES6+ features like spread operators or `Object.fromEntries()`).

**Other Alternatives**

If you were to implement a similar benchmark, you might consider using other approaches, such as:

* Using a library like Lodash or Ramda for functional programming and array/ object manipulation.
* Utilizing modern JavaScript features like async functions, promises, or generators.
* Adding additional tests that cover more complex scenarios, such as nested objects or arrays.

Keep in mind that the choice of approach will depend on your specific use case and performance requirements.

Related benchmarks:

assign vs direct (version: 0)

Comparing performance of: direct vs assign

Created: one year ago by: Guest

Jump to the latest result

direct

assign

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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