Benchmark: Array.prototype.concat vs spread operator - objAssignTwo

Tests:

Array.prototype.concat
const params = { "foo": [], "bar": [], "baz":[] }; const newObj = Object.assign({}, params); newObj.foo = "FOO"; return newObj;
spread operator
const params = { "foo": [], "bar": [], "baz":[] }; return {...params, foo: "FOO",}

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of MeasureThat.net and explore what's being tested in this benchmark.

**Benchmark Overview**

The benchmark is designed to compare two approaches for creating a new object by copying an existing one: `Array.prototype.concat` (traditional method) and the ES6 spread operator (`...`). The goal is to determine which approach is faster, more efficient, or both.

**Options Compared**

Two options are being compared:

1. **Array.prototype.concat**: This traditional method uses the `concat()` function to create a new array by concatenating multiple arrays.
2. **ES6 Spread Operator (`...`)**: This new feature allows creating a new object by spreading an existing object into the desired form.

**Pros and Cons of Each Approach**

Here's a brief summary of the pros and cons of each approach:

* **Array.prototype.concat**:
	+ Pros: widely supported, easy to understand.
	+ Cons: can be slower than other methods, may lead to unnecessary array creations.
* **ES6 Spread Operator (`...`)**:
	+ Pros: concise, efficient, and modern.
	+ Cons: may not work as expected in older browsers or environments.

**Library Usage**

None of the test cases uses any external libraries. The `Object.assign()` function is used in both benchmarks to create a new object by copying an existing one.

**Special JS Feature/Syntax**

The ES6 spread operator (`...`) is a relatively new feature introduced in ECMAScript 2015 (ES6). It allows creating a new object by spreading an existing object into the desired form, making it a concise alternative to traditional object creation methods.

**Other Alternatives**

Before settling on these two approaches, other alternatives could have been considered:

* `Object.create()`: This method creates a new object with respect to the given prototype.
* Destructuring assignment: Although not directly applicable to this benchmark, destructuring can be used to create a new object by extracting specific properties from an existing one.

Keep in mind that these alternative approaches might not be as concise or efficient as the spread operator or `concat()` method.

The benchmark seems well-structured and focuses on comparing two fundamental aspects of JavaScript: traditional array manipulation (`concat()`) versus modern object creation with the spread operator.

Latest run results:

Run details: (Test run date: 6 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.62 Safari/537.36

Browser/OS: Chrome 67 on Mac OS X 10.13.3

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	940068.9 Ops/sec
spread operator	1326741.8 Ops/sec

Related benchmarks:

Array.prototype.concat vs spread operator - objAssignTwo (version: 0)

Compare the new ES6 spread operator with the traditional concat() method

Comparing performance of: Array.prototype.concat vs spread operator

Created: 6 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):