Benchmark: String Concat vs JSON.stringify bulk

Script Preparation code:

var availableSizes = [];
for(var i=0;i<10000;i++){
  availableSizes.push({label: i, system: i});
}

Tests:

JSON.stringify
var output=[]; output = JSON.stringify(availableSizes);
String concat
var output=[], SUPER_DELIM = ' }~\t|{ '; for(var i=0, len=availableSizes.length; i<len; i++){ output.push(availableSizes[i].label + SUPER_DELIM + availableSizes[i].system); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
JSON.stringify
String concat

Fastest: N/A

Slowest: N/A

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/135.0.0.0 Safari/537.36

Browser/OS: Chrome 135 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
JSON.stringify	2184.7 Ops/sec
String concat	4264.2 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and the pros/cons of different approaches.

**Benchmark Overview**

The benchmark compares two ways to concatenate strings in JavaScript: `JSON.stringify` and string concatenation using a delimiter (`SUPER_DELIM`). The goal is to determine which approach is faster.

**Available Sizes**

In the provided JSON, we have a script preparation code that creates an array `availableSizes` with 10,000 elements. Each element has two properties: `label` and `system`. This array will be used as input for both test cases.

**Test Cases**

There are two test cases:

1. **JSON.stringify**: The benchmark definition is `var output=[]; output = JSON.stringify(availableSizes);`. This test case uses the `JSON.stringify()` method to concatenate the elements of the `availableSizes` array into a single string.
2. **String Concat**: The benchmark definition is `var output=[], SUPER_DELIM = ' }~\\t|{ '; for (var i=0, len=availableSizes.length; i<len; i++) { output.push(availableSizes[i].label + SUPER_DELIM + availableSizes[i].system); }`. This test case uses a delimiter (`SUPER_DELIM`) to concatenate the elements of the `availableSizes` array into a single string.

**Pros and Cons**

**JSON.stringify()**

Pros:

* Easy to implement: No need to manually concatenate strings.
* Can be faster for small arrays, as it's optimized for serialization.

Cons:

* May not perform well for large arrays due to its internal string creation overhead.
* Can be slower than manual concatenation in some cases.

**String Concat**

Pros:

* Typically faster than `JSON.stringify()` for large arrays, as it avoids the internal string creation overhead.
* More control over the resulting string, as the delimiter can be customized.

Cons:

* Requires manual management of the delimiter and string concatenation.
* Can lead to performance issues if not implemented correctly (e.g., using too many concatenations).

**Other Considerations**

* **Browser differences**: The benchmark results are specific to Chrome 124 on Windows. Other browsers may have different performance characteristics, so it's essential to consider cross-browser testing.
* **Array size**: The benchmark uses a relatively small array size of 10,000 elements. Larger arrays may require more significant optimization and consideration of the trade-offs between `JSON.stringify()` and string concatenation.

**Library**

In this case, there is no specific JavaScript library being used. However, some browsers have built-in optimizations or polyfills for `JSON.stringify()` that might affect performance.

**Special JS Feature/Syntax**

There are no special features or syntax in this benchmark. Both test cases use standard JavaScript methods and constructs.

**Alternatives**

Other alternatives to consider when concatenating strings in JavaScript include:

* Using a library like Lodash's `join()` function, which provides an efficient way to concatenate arrays.
* Utilizing modern JavaScript features like template literals (e.g., `template literals` ) for string interpolation.
* Leveraging browser-specific optimizations or APIs for array manipulation.

In conclusion, the benchmark highlights the importance of considering performance trade-offs when choosing between `JSON.stringify()` and string concatenation in JavaScript. The pros and cons of each approach vary depending on the specific use case, such as array size and desired outcome.

Related benchmarks:

String Concat vs JSON.stringify bulk (version: 0)

String Concat vs JSON.stringify

Comparing performance of: JSON.stringify vs String concat

Created: 3 years ago by: Guest

Jump to the latest result

JSON.stringify

String concat

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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