Benchmark: ES6 spread operator vs Array.concat

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:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:76.0) Gecko/20100101 Firefox/76.0

Browser/OS: Firefox 76 on Mac OS X 10.14

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Test name	Executions per second
Array.prototype.concat	12747581.0 Ops/sec
spread operator	13659456.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

I'll explain the benchmark and its components.

**Benchmark Overview**

The given JSON represents a JavaScript microbenchmark on MeasureThat.net, which compares the performance of two approaches: the ES6 spread operator (`...`) and the `Array.prototype.concat()` method. The goal is to determine which approach is faster for creating a new array by concatenating an existing array with another array.

**Script Preparation Code**

There is no script preparation code provided in the JSON, which means that the benchmark creator did not include any additional setup or teardown code before running each test case. This could be either because it was not necessary or because the focus of the benchmark was solely on comparing the two approaches.

**Individual Test Cases**

The benchmark consists of two individual test cases:

1. **Array.prototype.concat**: This test case uses the `concat()` method to concatenate an existing array (`[ 1, 2 ]`) with another array (`params`). The `params` array is created by passing three values: `"hello"`, `true`, and `7`. The resulting concatenated array is stored in the `other` variable.
2. **Spread Operator**: This test case uses the ES6 spread operator (`...`) to create a new array by concatenating an existing array (`[ 1, 2 ]`) with another array (`params`). The `params` array is created by passing three values: `"hello"`, `true`, and `7`. The resulting concatenated array is stored in the `other` variable.

**Pros and Cons of Each Approach**

**Array.prototype.concat()**

Pros:

* Well-established and widely supported method
* Can be used for concatenating arrays of arbitrary data types

Cons:

* Can create a new array object, which can lead to performance issues if the original arrays are very large
* May not be as efficient as other methods for creating new arrays with small amounts of data

**ES6 Spread Operator**

Pros:

* Creates a new array with minimal overhead
* More concise and expressive than `concat()`
* Can handle arrays of arbitrary data types

Cons:

* Not all browsers support the ES6 spread operator (although it is widely supported)
* May not be as efficient for very large arrays due to the creation of a temporary array object

**Other Considerations**

When comparing these two approaches, it's essential to consider the context in which they are used. For small amounts of data, the ES6 spread operator may be faster and more efficient. However, for larger datasets or performance-critical applications, the `concat()` method might be a better choice due to its widespread support and established performance characteristics.

**Library**

There is no specific library mentioned in the benchmark JSON. The focus is on comparing two built-in JavaScript methods: `Array.prototype.concat()` and the ES6 spread operator.

**Special JS Feature or Syntax**

The ES6 spread operator (`...`) is a feature introduced in ECMAScript 2015, which allows creating new arrays by concatenating existing arrays using the syntax `[ ...array ]`. This feature was added to JavaScript in modern browsers and Node.js environments.

That's a summary of the benchmark and its components!

Related benchmarks:

ES6 spread operator vs Array.concat (version: 0)

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

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

Created: 4 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 6 months ago):