Benchmark: Array concat vs spread operator vs push tamvm

Tests:

Array.prototype.concat
let temp = [] var params = ['1','1','1','1','1','1','1','1','1','1','1','1','1','1','1',] params.forEach(p => temp = temp.concat([p]))
spread operator
let temp = [] var params = ['1','1','1','1','1','1','1','1','1','1','1','1','1','1','1',] params.forEach(p => temp = [...temp, p])
Push
let temp = [] var params = ['1','1','1','1','1','1','1','1','1','1','1','1','1','1','1',] params.forEach(p => temp.push(p))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator
Push

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_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.102 Safari/537.36

Browser/OS: Chrome 85 on Mac OS X 10.15.6

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	388672.8 Ops/sec
spread operator	1224644.9 Ops/sec
Push	16474246.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its test cases.

**Benchmark Overview**

The benchmark is designed to compare three different approaches for appending elements to an array: `concat()`, the spread operator (`...`), and `push()`.

**Options Compared**

1. **Array.prototype.concat**: This method creates a new array and returns it, taking ownership of the original array.
2. **Spread Operator ( ... )**: This is a shorthand syntax for creating a new array by spreading elements from an existing array or iterable.
3. **Array.prototype.push()**: This method adds one or more elements to the end of the array.

**Pros and Cons**

* **concat()**:
	+ Pros: It's a well-established, widely supported method that works in older browsers.
	+ Cons: It creates a new array, which can be memory-intensive for large arrays. It also modifies the original array, losing its original state.
* **Spread Operator ( ... )**:
	+ Pros: It's concise and readable, and it doesn't create a new array or modify the original one.
	+ Cons: It's only supported in modern browsers and JavaScript engines. Older browsers might not understand it.
* **push()**:
	+ Pros: It modifies the original array in place, which can be more efficient than creating a new array.
	+ Cons: It doesn't return anything, making it less flexible than `concat()`.

**Library Usage**

None of the test cases use any external libraries. The tests are self-contained and only rely on JavaScript's built-in functions.

**Special JS Feature or Syntax**

The spread operator (`...`) is a relatively new feature introduced in ECMAScript 2015 (ES6). It's not supported in older browsers, which might affect the benchmark results.

**Other Considerations**

When dealing with large arrays or performance-critical code, it's essential to consider the trade-offs between memory usage and execution speed. Creating a new array can be expensive, especially for large datasets.

In modern JavaScript development, using the spread operator or `push()` is generally recommended over `concat()`, as it avoids creating unnecessary copies of the original data.

**Alternatives**

If you need to support older browsers or want to explore other approaches, consider these alternatives:

* **Array.prototype.set()**: Introduced in ECMAScript 2020 (ES2020), this method replaces elements in an array while preserving the rest.
* **Typed arrays**: For specific use cases like numerical or binary data, typed arrays can provide better performance and memory efficiency.

Keep in mind that each approach has its pros and cons, and the choice ultimately depends on your specific use case and requirements.

Related benchmarks:

Array concat vs spread operator vs push tamvm (version: 0)

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

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

Created: 4 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Push

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):