Benchmark: Substring vs replace

Script Preparation code:

var string = "url(https://fiddle.jshell.net/_display/#custom-id)";
var url = "https://fiddle.jshell.net/_display/";
var result;

Tests:

Replaces
result = string.replace(url, '').replace('url(#', '').replace(')', '')
IndexOf + substring
result = string.substring(string.indexOf(url), string.indexOf(url) + url.length).substring(string.indexOf("url(#") + 5).replace(')', '')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Replaces
IndexOf + substring

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmark test case, where two different approaches are compared: using `String.prototype.replace()` and `String.prototype.indexOf()` in combination with `String.prototype.substring()`. The benchmark aims to measure the performance of these approaches in replacing or extracting substrings from a given string.

**Options Compared**

Two options are compared:

1. **`String.prototype.replace()`**: This method replaces all occurrences of a specified pattern (in this case, the URL) with an empty string (`''`) and then removes any remaining characters that match the `url(#)` pattern.
2. **`String.prototype.indexOf()` + `String.prototype.substring()`**: This approach uses `String.indexOf()` to find the index of the first occurrence of the URL in the original string, extracts a substring from the original string starting at this index and for specified length, removes `url(#)` and `)` characters.

**Pros and Cons**

* **`String.prototype.replace()`**:
	+ Pros: Simple, straightforward, and efficient.
	+ Cons: May be slower if the replacement pattern is complex or the string is very large, as it needs to scan the entire string for matches.
* **`String.prototype.indexOf()` + `String.prototype.substring()`**:
	+ Pros: Can be more precise in certain cases (e.g., when only a portion of the URL needs to be extracted).
	+ Cons: More complex and may involve additional overhead due to the extra steps required.

**Library Usage**

None of the test code uses any external libraries. However, it's worth noting that some browsers (like Firefox Mobile) have their own custom strings or string manipulation methods (`String.prototype.replace()`), which might be used under the hood. But this is not explicitly stated in the benchmark definition.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax used in these test cases, making them accessible to a wide range of software engineers with varying levels of familiarity with JavaScript.

**Alternatives**

Other alternatives for testing string manipulation performance might include:

1. Using regular expressions (`RegExp`) instead of `String.prototype.replace()`.
2. Employing more advanced techniques like String Pooling or caching.
3. Comparing different sorting algorithms (e.g., Bubble Sort, Merge Sort) for strings.
4. Measuring the performance of string compression techniques.

**Benchmark Preparation Code Explanation**

The script preparation code initializes two variables: `string` and `url`, which are used to construct a string with the URL pattern (`"url(https://fiddle.jshell.net/_display/#custom-id)")`. The `result` variable is initialized but not assigned a value, indicating that it's only used as a placeholder for the benchmark.

The HTML preparation code is empty, suggesting that this benchmark may be executed in a headless environment (e.g., Node.js) or doesn't require any specific HTML structure.

Related benchmarks:

Substring vs replace (version: 0)

Comparing performance of: Replaces vs IndexOf + substring

Created: 6 years ago by: Guest

Jump to the latest result

Replaces

IndexOf + substring

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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