Benchmark: JavaScript spread operator vs Object.assign performance AAAAAA

Tests:

Using the spread operator
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = { ...firstObject, ...secondObject };
Using Object.assign
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = Object.assign({}, firstObject, secondObject);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Using the spread operator
Using Object.assign

Fastest: N/A

Slowest: N/A

Latest run results:

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

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I'll break down the explanation for you.

**Benchmark Definition**

The provided JSON represents a benchmarking test created on the MeasureThat.net website. The test compares the performance of two different approaches: using the spread operator (`...`) and `Object.assign()` to merge two objects into a new object.

**Options Compared**

There are two options being compared:

1. **Using the Spread Operator**: This approach uses the syntax `{...firstObject, ...secondObject}` to merge the properties of two objects into a new object.
2. **Using Object.assign()**: This approach uses the `Object.assign()` method to merge the properties of two objects into a new object.

**Pros and Cons**

**Using the Spread Operator:**

Pros:

* Concise and readable syntax
* Efficient for merging small objects
* Native JavaScript feature, so no additional library is required

Cons:

* Can lead to confusion in complex merge scenarios (e.g., when dealing with nested objects)
* May have performance implications due to the creation of a new object

**Using Object.assign():**

Pros:

* Widely supported and understood approach
* Allows for more control over the merge process (e.g., specifying the target object)
* Can be useful in complex scenarios where the spread operator may not work as expected

Cons:

* Requires knowledge of the `Object.assign()` method, which can lead to confusion if not used correctly
* May have performance implications due to the creation of a new object or multiple assignments

**Library and Purpose**

The test case uses no external library. The JavaScript features being tested are native to JavaScript.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax mentioned in this benchmark.

**Other Alternatives**

Other alternatives for merging objects could include:

1. **Array.prototype.reduce()**: This method can be used to merge objects by iterating over the properties of one object and assigning them to a new object.
2. **JSON.parse(JSON.stringify())**: This approach involves serializing both objects as JSON strings and then parsing them back into objects, which effectively merges their properties.

However, using these alternatives might not provide significant performance benefits over the spread operator or `Object.assign()` approaches mentioned in this benchmark.

Related benchmarks:

JavaScript spread operator vs Object.assign performance AAAAAA (version: 0)

Comparing performance of: Using the spread operator vs Using Object.assign

Created: 4 years ago by: Guest

Jump to the latest result

Using the spread operator

Using Object.assign

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):