Benchmark: testsetas - MeasureThat.net

Tests:

array concat
let text = []; for (i = 10000; i > 0; i--) { text[i] = "some text"; } const val = text.join(" ");
array push
var text = []; for (i = 10000; i > 0; i--) { text.push('some text'); } var val = text.join(" ");
concat
var text = ''; for (i = 10000; i > 0; i--) { text += ` some text`; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
array concat
array push
concat

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down what's being tested in the provided benchmark.

**Benchmark Overview**

The benchmark measures the performance of three different ways to concatenate strings or arrays in JavaScript:

1. **String Concatenation**: Using the `+` operator to concatenate two strings, such as `"some text" + "another text"` (later modified to use template literals).
2. **Array Push**: Using the `push()` method to add an element to an array and then joining the array using the `join()` method.
3. **Concat (template literals)**: Using template literals (`${expression}`) to concatenate strings.

**Library Usage**

None of the benchmark tests use any external libraries.

**Special JavaScript Features/Syntax**

The benchmark uses template literals, which is a relatively modern feature in JavaScript introduced in ECMAScript 2015 (ES6). Template literals allow for more readable and efficient string concatenation using the `${expression}` syntax. However, older JavaScript engines might not support this feature or have limited support.

**Options Compared**

The three options are compared in terms of their performance:

* **String Concatenation**: Using the `+` operator to concatenate strings.
* **Array Push**: Using the `push()` method to add an element to an array and then joining the array using the `join()` method.
* **Concat (template literals)**: Using template literals (`${expression}`) to concatenate strings.

**Pros and Cons of Each Approach**

1. **String Concatenation**
	* Pros: Simple, widely supported.
	* Cons:
		+ Can be slower due to string object creation and copying.
		+ Leads to temporary objects being created, which can cause garbage collection issues.
2. **Array Push + Join**
	* Pros: Efficient use of arrays, no temporary objects are created.
	* Cons:
		+ Requires extra memory allocation for the array.
		+ Join operation can be slower than string concatenation due to array iteration.
3. **Concat (template literals)**
	* Pros: More readable, efficient, and less prone to garbage collection issues.
	* Cons:
		+ Limited support in older JavaScript engines.

**Other Considerations**

The benchmark also provides information on the browser, device platform, operating system, and execution speed for each test. This can help analyze performance variations across different environments.

If you're interested in exploring alternative approaches or understanding more about template literals, here are some additional resources:

* For an overview of template literals: [MDN Web Docs - Template Literals](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Templates)
* For a comparison of string concatenation and array push/join: [W3Schools - String Concatenation vs. Array Join](https://www.w3schools.com/js/js_string_concat.asp)

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Safari/537.36

Browser/OS: Chrome 117 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
array concat	4304.5 Ops/sec
array push	8859.6 Ops/sec
concat	21466.9 Ops/sec

Related benchmarks:

testsetas (version: 0)

Comparing performance of: array concat vs array push vs concat

Created: one year ago by: Guest

Jump to the latest result

array concat

array push

concat

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):