Benchmark: JSON.stringify array vs join Updated

Script Preparation code:

var arr_small = Array.from({ length: 10 }).map((_, i) => `test_val${i}`);
var arr_big = Array.from({ length: 10000 }).map((_, i) => `test_val${i}`);

Tests:

JSON.stringify
JSON.stringify(arr_small); JSON.stringify(arr_big);
array.join + string template
`["${arr_small.join('","')}"]`; `["${arr_big.join('","')}"]`;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
JSON.stringify
array.join + string template

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser/OS: Chrome 128 on Windows

View result in a separate tab

Test name	Executions per second
JSON.stringify	2958.7 Ops/sec
array.join + string template	3404.6 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark and its results in a way that's easy to understand, even for those without deep knowledge of JavaScript.

**Benchmark Overview**

The provided JSON represents a microbenchmark created on MeasureThat.net. The goal is to compare two approaches for concatenating arrays: `JSON.stringify()` and array methods like `join()`. We'll dive into the details of each approach, their pros and cons, and other considerations.

**Test Case 1: JSON.stringify**

The first test case uses the built-in JavaScript function `JSON.stringify()`. This method converts a JavaScript object (in this case, an array) to a string representation. The resulting string is then concatenated with another string using the `+` operator.

Pros:

* Simple and straightforward implementation
* Works well for small arrays

Cons:

* Can be slower than other methods, especially for large arrays
* May not be as efficient in terms of memory usage

**Test Case 2: array.join + string template**

The second test case uses the `join()` method on an array, combined with a template literal (a feature introduced in ECMAScript 2015). The `join()` method concatenates all elements of an array into a single string, separated by the specified separator.

Pros:

* Can be faster than `JSON.stringify()` for large arrays
* Uses less memory compared to `JSON.stringify()`

Cons:

* Requires modern JavaScript (ECMAScript 2015 and above) to work with template literals
* May not work in older browsers or environments

**Other Considerations**

When choosing between these two approaches, consider the following factors:

* Performance: If you're dealing with large arrays, `array.join + string template` might be a better choice due to its potential speed advantage.
* Memory usage: `JSON.stringify()` can consume more memory than `array.join + string template`, especially for very large arrays.
* Compatibility: If you need to support older browsers or environments that don't support modern JavaScript features, you may need to use `JSON.stringify()`.

**Library/Feature Mention**

There's no specific library mentioned in the provided JSON. However, if we were to include libraries like Lodash (which has a `join()` method), it would affect the comparison results.

**Special JS Features/Syntax**

The benchmark uses template literals (introduced in ECMAScript 2015) for the second test case. Template literals provide a more readable and efficient way to concatenate strings with variables.

In summary, MeasureThat.net's JSON represents a microbenchmark that compares two approaches for concatenating arrays: `JSON.stringify()` and array methods like `join()`. The choice between these approaches depends on factors such as performance, memory usage, and compatibility. Understanding the pros and cons of each approach can help you make informed decisions when working with JavaScript arrays.

**Other Alternatives**

If you're looking for alternative ways to concatenate arrays, consider:

* Using a library like Lodash or Ramda
* Implementing your own string concatenation function
* Using a different data structure, such as an array of strings (instead of an array of values)

Keep in mind that the best approach depends on your specific use case and requirements.

Related benchmarks:

JSON.stringify array vs join Updated (version: 0)

Comparing performance of: JSON.stringify vs array.join + string template

Created: 5 years ago by: Guest

Jump to the latest result

JSON.stringify

array.join + string template

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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