Benchmark: Simple substring vs replace

Script Preparation code:

var string = "testid_patient_patiensson_product/";
var result;

Tests:

Replaces
result = string.replace("/", "")
IndexOf + substring
result = string.substring(0, string.indexOf("/"))

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:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36

Browser/OS: Chrome 107 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Replaces	3871310.5 Ops/sec
IndexOf + substring	3974908.5 Ops/sec

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

LLMs can make mistakes. Check important info.

**Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON represents a benchmark definition with two test cases: "Simple substring vs replace". This explanation will help software engineers understand what is tested, the pros and cons of different approaches, and other considerations.

**Benchmark Definition**

The benchmark definition is represented by the following JSON:

```
{
  "Name": "Simple substring vs replace",
  "Description": null,
  "Script Preparation Code": "var string = \"testid_patient_patiensson_product/\";\r\nvar result;",
  "Html Preparation Code": null
}
```

**Options Compared**

The two test cases compare the performance of two approaches to achieve a similar goal:

1. **Replacing `/` with an empty string**: `result = string.replace("/", "")`
2. **Finding the index of `/` and taking a substring from the start**: `result = string.substring(0, string.indexOf("/"))`

**Pros and Cons**

Here's a brief analysis of each approach:

### Replacing `/` with an empty string

* Pros:
	+ Simple and straightforward.
	+ Fewer operations involved (only one method call).
* Cons:
	+ May be slower due to the regular expression engine's overhead.

### Finding the index of `/` and taking a substring from the start

* Pros:
	+ Can be faster for large strings since it avoids the regex engine's overhead.
* Cons:
	+ More operations involved (two method calls: `indexOf` and `substring`).
	+ May not be as efficient if the string contains many `/` characters.

**Library Usage**

Neither of the test cases uses any external libraries. However, if you were to modify the script preparation code to use a library like `lodash`, you might use the `replace()` method with an empty string, or use the `indexOf()` and `substring()` methods as shown in the benchmark definition.

**Special JavaScript Feature/Syntax**

There are no special JavaScript features or syntax used in this benchmark. The tests only rely on standard JavaScript functionality.

**Alternative Approaches**

Other alternatives to compare could include:

1. Using a more efficient regex pattern (e.g., `\s+` instead of `\/`)
2. Using a different string manipulation library (like `String.prototype.replace()` with a callback)
3. Comparing performance using other methods, such as `string.split("/")` or `string.slice(0, string.indexOf("/"))`

Keep in mind that the specific alternatives will depend on your goals and requirements for the benchmark.

**Benchmark Preparation Code**

The script preparation code is:

```javascript
var string = "testid_patient_patiensson_product/";
var result;
```

This sets up a test string with no trailing `/` characters, which can affect the performance results.

Related benchmarks:

Simple substring vs replace (version: 0)

Comparing performance of: Replaces vs IndexOf + substring

Created: 2 years ago by: Guest

Jump to the latest result

Replaces

IndexOf + substring

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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