Benchmark: JavaScript spread operator comparisons wide vs narrow spread ordering

Tests:

Spread wide then narrow
const wideObject = { one: "one", two: "two", three: "three", four: "four", five: "five", six: "six" } const narrowObject = { foo: "bar" } const finalObject = { ...wideObject, ...narrowObject };
Spread narrow then wide
const wideObject = { one: "one", two: "two", three: "three", four: "four", five: "five", six: "six" } const narrowObject = { foo: "bar" } const finalObject = { ...narrowObject, ...wideObject };

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread wide then narrow
Spread narrow then wide

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Linux; Android 10; JSN-L21) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.104 Mobile Safari/537.36

Browser/OS: Chrome Mobile 96 on Android

View result in a separate tab

Test name	Executions per second
Spread wide then narrow	364875.1 Ops/sec
Spread narrow then wide	86712.8 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

The provided benchmark is designed to measure and compare the performance of two approaches when using the JavaScript spread operator (`...`).

**What are the options being compared?**

In this benchmark, we have two test cases:

1. **Spread wide then narrow**: In this approach, an object with multiple properties (the "wide" object) is first spread into a new object, and then another object (the "narrow" object) is spread into that resulting object.
2. **Spread narrow then wide**: This approach is the reverse of the previous one, where the "narrow" object is first spread into a new object, and then the "wide" object is spread into that resulting object.

**Pros and Cons of each approach:**

1. **Spread wide then narrow**:
	* Pros: May be faster because it avoids the overhead of spreading an object with many properties.
	* Cons: If the subsequent object being spread has fewer properties, it may lead to more objects being created, which can negatively impact performance.
2. **Spread narrow then wide**:
	* Pros: Can avoid the overhead of creating intermediate objects, as the "wide" object is spread directly into the resulting object.
	* Cons: May be slower due to the additional object creation.

In general, the choice between these approaches depends on the specific use case and the properties of the objects being manipulated. MeasureThat.net allows you to experiment with different scenarios to determine which approach is more suitable for your needs.

**Library usage:**

None of the test cases explicitly use any libraries. The benchmark only relies on standard JavaScript functionality, including the spread operator (`...`).

**Special JS feature or syntax:**

The benchmark utilizes a specific syntax related to the spread operator, but no special features or syntax are used beyond that. If you're interested in exploring more advanced topics, such as modern JavaScript features (e.g., async/await, destructuring), MeasureThat.net may have additional benchmarks.

**Alternatives:**

If you'd like to explore similar benchmarks or compare performance of other JavaScript constructs, here are some alternatives:

* **MeasureThat.net's existing benchmarks**: The platform offers a vast collection of benchmarking tests covering various aspects of JavaScript development, such as regex performance, DOM manipulation, and more.
* **Benchmarking libraries**: Libraries like Benchmark.js, jsperf, or Microbenchmark (for Node.js) provide tools for creating and running microbenchmarks. These libraries often offer more advanced features and customization options than the built-in MeasureThat.net benchmarks.

In conclusion, this benchmark on MeasureThat.net allows you to experiment with two different approaches to using the JavaScript spread operator, helping you determine which approach is more efficient in your specific use cases.

Related benchmarks:

JavaScript spread operator comparisons wide vs narrow spread ordering (version: 0)

Comparing performance of: Spread wide then narrow vs Spread narrow then wide

Created: 4 years ago by: Guest

Jump to the latest result

Spread wide then narrow

Spread narrow then wide

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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