Benchmark: spread join vs split join vs replace

Script Preparation code:

window.a = 'abcdefghijklmnopqrstuvwxyz'

Tests:

spread
const r = [...a].join('.*?')
split
const r = a.split('').join('.*?')
replace
const r = a.replace(/(.)/g, '$1*?')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread
split
replace

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.101 Safari/537.36

Browser/OS: Chrome 87 on Windows

View result in a separate tab

Test name	Executions per second
spread	606747.1 Ops/sec
split	595200.4 Ops/sec
replace	353789.1 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll explain the benchmark and its options.

**Benchmark Definition**

The provided JSON defines a JavaScript microbenchmark that compares three different string operations:

1. **Spread**: Creating a new array by spreading the characters of a string (`"abcdefghijklmnopqrstuvwxyz"`).
2. **Split**: Splitting the characters of a string into an array using the `split` method.
3. **Replace**: Replacing each character in a string with another string using the `replace` method.

**Options Compared**

The benchmark compares the performance of these three operations on different strings, specifically `"abcdefghijklmnopqrstuvwxyz"`.

* The `spread` option creates a new array by spreading the characters of the input string.
* The `split` option splits the characters of the input string into an array using the default separator ( whitespace).
* The `replace` option replaces each character in the input string with another string.

**Pros and Cons of Each Approach**

1. **Spread**: This approach is simple to implement and doesn't require any additional libraries or dependencies.
	* Pros: Easy to understand, fast execution time.
	* Cons: Requires creating a new array, which can be memory-intensive for large inputs.
2. **Split**: This approach uses the `split` method, which splits a string into an array using a specified separator.
	* Pros: Efficient use of memory, doesn't require creating a new array.
	* Cons: Requires the `split` method, which might not be optimized for performance in all browsers.
3. **Replace**: This approach uses the `replace` method to replace each character in the input string with another string.
	* Pros: Fast execution time, efficient use of memory.
	* Cons: Requires using a regular expression (regex) pattern, which can be slower than simple string operations.

**Library Used**

None explicitly mentioned. However, the benchmark uses the built-in `split` and `replace` methods, which are part of the JavaScript language specification.

**Special JS Features or Syntax**

No special features or syntax used in this benchmark.

**Other Alternatives**

If you're looking for alternatives to these operations:

* Instead of spreading a string into an array, you could use other methods like `Array.from()` or `String.prototype.split()`.
* For the `split` operation, you could also use a custom separator or regular expression pattern.
* For the `replace` operation, you could use a different replacement strategy, such as using a callback function or modifying the original string in place.

Keep in mind that these alternatives might change the performance characteristics of the benchmark results.

Related benchmarks:

spread join vs split join vs replace (version: 0)

Comparing performance of: spread vs split vs replace

Created: 4 years ago by: Guest

Jump to the latest result

spread

split

replace

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):