Benchmark: Spread vs Assign benchmark2

Tests:

Basic object spread
const obj = { foo: 1, bar: 2 }; const obj2 = { baz: 3 }; const finalObject = ({...obj2, ...obj })
Basic assign operator
const obj = { foo: 1, bar: 2 }; const obj2 = { baz: 3 }; const finalObject = Object.assign(obj2, obj);
Assign with empty object
const obj = { foo: 1, bar: 2 }; const obj2 = { baz: 3 }; Object.assign({}, obj, obj2);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Basic object spread
Basic assign operator
Assign with empty object

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_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.61 Safari/537.36

Browser/OS: Chrome 94 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Basic object spread	765737.4 Ops/sec
Basic assign operator	4400208.0 Ops/sec
Assign with empty object	3729484.5 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON represents a benchmark with three test cases, each testing a different approach to creating an object by spreading or assigning properties from two source objects.

**Test Case 1: Basic Object Spread**

The first test case measures the performance of creating an object using the spread operator (`{...obj2, ...obj}`).

```javascript
const obj = { foo: 1, bar: 2 };
const obj2 = { baz: 3 };
const finalObject = ({...obj2, ...obj});
```

**Pros and Cons**

* **Pros**: The spread operator is a concise and readable way to create an object by spreading properties from multiple sources.
* **Cons**: The performance of this approach may vary depending on the number of properties being spread.

**Test Case 2: Basic Assign Operator**

The second test case measures the performance of creating an object using the assignment operator (`Object.assign(obj2, obj)`).

```javascript
const obj = { foo: 1, bar: 2 };
const obj2 = { baz: 3 };
const finalObject = Object.assign(obj2, obj);
```

**Pros and Cons**

* **Pros**: The assignment operator is a widely supported and efficient way to create an object by assigning properties from multiple sources.
* **Cons**: This approach may require additional setup (e.g., checking if `obj` and `obj2` are objects) to ensure correct behavior.

**Test Case 3: Assign with Empty Object**

The third test case measures the performance of creating an object using the assignment operator with an empty object (`Object.assign({}, obj, obj2)`).

```javascript
const obj = { foo: 1, bar: 2 };
const obj2 = { baz: 3 };
Object.assign({}, obj, obj2);
```

**Pros and Cons**

* **Pros**: This approach is useful when creating an object from multiple sources with different lengths.
* **Cons**: The performance of this approach may be slower due to the overhead of creating an empty object.

**Library Used: None**

None of the test cases use any libraries, making them self-contained and easy to understand.

**Special JS Features or Syntax: None**

The benchmark does not use any special JavaScript features or syntax beyond what is standard in modern JavaScript.

**Other Alternatives**

Alternative approaches to creating objects could include:

1. Using `Object.create()` method
2. Using a library like Lodash's `cloneDeep()` function
3. Using a template literal with the spread operator (`{...obj, ...obj2}`)

However, these alternatives are not tested in this benchmark, and their performance may vary depending on specific use cases.

**Benchmark Preparation Code: None**

The provided JSON does not include any preparation code for setting up the test environment or loading dependencies.

Related benchmarks:

Spread vs Assign benchmark2 (version: 0)

Comparing performance of: Basic object spread vs Basic assign operator vs Assign with empty object

Created: 3 years ago by: Guest

Jump to the latest result

Basic object spread

Basic assign operator

Assign with empty object

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):