Benchmark: Object.assign vs spread operator GOOD

Tests:

Object.assign
var params = { b:"hello", c: true, d:7 }; var other = Object.assign({}, { a: 2 }, params);
spread operator
var params = { b:"hello", c: true, d:7 }; var other = { a: 2, ...params };
Manual Update
var params = { b:"hello", c: true, d:7 }; params.a = 2; params.b = "NEW TEXT";

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.assign
spread operator
Manual Update

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided JSON represents a JavaScript microbenchmark that compares the performance of three approaches to merge two objects:

1. `Object.assign()`
2. Spread Operator (`...`)
3. Manual Update (directly modifying one object)

**Options Comparison**

* **`Object.assign()`**: This method creates a shallow copy of an object and merges it with another object.
	+ Pros: Simple, widely supported, and easy to understand.
	+ Cons: Can be slower than other methods for large objects or when merging deep objects.
* **Spread Operator (`...`)**: This operator spreads the properties of one object into another.
	+ Pros: Fast, concise, and readable. It's a modern JavaScript feature that's widely supported in recent browsers.
	+ Cons: May not work as expected for nested objects or complex data structures.
* **Manual Update**: This approach involves directly modifying one object to add new properties.
	+ Pros: Can be faster than `Object.assign()` when adding small numbers of properties, but slower when updating large numbers of properties.
	+ Cons: Requires more manual effort and can lead to errors if not done correctly.

**Library and Special JS Features**

In this benchmark, the following libraries are used:

* None explicitly mentioned in the provided JSON. However, it's likely that the test environment uses a modern JavaScript engine that supports the spread operator.
* No special JavaScript features or syntax are used in this benchmark.

**Benchmark Preparation Code and Test Cases**

The script preparation code is empty, which means that no additional setup or initialization is required before running each test case. The test cases themselves contain:

1. A `Benchmark Definition` string that describes the scenario to be tested.
2. A `Test Name` that identifies the approach being compared (e.g., "Object.assign").

**Latest Benchmark Results**

The results show the performance of each approach on a specific system configuration:

* **Manual Update**: This approach performs relatively well, suggesting that it's efficient for small updates.
* **Spread Operator (`...`)**: This operator is faster than `Object.assign()` but slower than Manual Update. It's likely due to the overhead of spreading properties from one object into another.
* **`Object.assign()`**: This method is slower than both spread operator and manual update, which suggests that it might be less efficient for merging objects.

**Other Alternatives**

If you're interested in exploring alternative approaches or optimizing performance, consider these options:

* Using `Object.create()` instead of `Object.assign()`.
* Implementing a custom merge function using recursion or iteration.
* Utilizing libraries like Lodash or Ramda for object manipulation and merging.
* Considering the use of WebAssembly (WASM) or other low-level optimizations to improve performance.

Keep in mind that performance differences between these approaches might be negligible for most use cases, and your choice should ultimately depend on readability, maintainability, and specific requirements.

Related benchmarks:

Object.assign vs spread operator GOOD (version: 0)

Comparing performance of: Object.assign vs spread operator vs Manual Update

Created: 6 years ago by: Guest

Jump to the latest result

Object.assign

spread operator

Manual Update

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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