Benchmark: Array concat vs two spread operator

Tests:

Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello", true, 7 ] var other = [...[ 1, 2], ...params ]

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

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON data to understand what is being tested on MeasureThat.net.

**Benchmark Definition**
The benchmark definition represents a specific JavaScript microbenchmark. In this case, it compares two approaches for concatenating arrays:

1. The traditional `Array.prototype.concat()` method with `push()`.
2. A new ES6 spread operator (`...`) that was introduced to create a shallow copy of an array.

**Options Compared**
The options being compared are the performance and efficiency of these two approaches in JavaScript.

**Pros and Cons**

* **Traditional `concat()` method with `push()`**:
	+ Pros: widely supported, well-established method.
	+ Cons: can be slower than the new spread operator approach, especially for large arrays.
* **New ES6 spread operator (`...`)**:
	+ Pros: faster than traditional `concat()` method, more concise syntax.
	+ Cons: may not work in older browsers or environments that don't support ES6 features.

**Library and Purpose**
There is no explicit mention of a library in the provided JSON data. However, it's worth noting that JavaScript engines like V8 (used by Chrome) are constantly evolving and adding new features to improve performance.

**Special JS Feature/Syntax**
The benchmark uses the ES6 spread operator (`...`), which was introduced as part of ECMAScript 2015. This feature allows for creating a shallow copy of an array in a single line of code, making it more concise and efficient than traditional methods.

**Other Considerations**

* The benchmark is designed to test the performance difference between two approaches in JavaScript.
* MeasureThat.net provides a platform for users to create and run these microbenchmarks to compare different JavaScript implementations.
* This benchmark is likely part of a larger set of benchmarks that cover various aspects of JavaScript performance, syntax, and library usage.

**Alternative Approaches**
If you're looking for alternative ways to concatenate arrays in JavaScript, there are a few other options:

1. `Array.prototype.push()`: This method appends elements to the end of an array and returns the length of the resulting array.
2. `Array.prototype.splice()`: This method inserts or removes elements from an array at a specified index.
3. Using a library like Lodash, which provides a `concat` function that can be used for concatenating arrays.

Keep in mind that these alternatives may have different performance characteristics compared to the spread operator and traditional `concat()` method.

Related benchmarks:

Array concat vs two spread operator (version: 0)

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

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

Created: 5 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

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):