Benchmark: Path test - MeasureThat.net

Script Preparation code:

var substringTest = function (str) {
    return str.substring(str.lastIndexOf('/')+1);
}

var replaceTest = function (str) {
    return str.replace(/^.*(\\|\/|\:)/, '');
}

var execTest = function (str) {
    return /([^\\]+)$/.exec(str)[1];
}

var splitTest = function (str) {
    return str.split('\\').pop().split('/').pop();
}

Tests:

substring
substringTest('eu-west-1:584172ba-6a82-248a-4162-cyac56119052/secondary/node_test.js')
replace
replaceTest('eu-west-1:584172ba-6a82-248a-4162-cyac56119052/secondary/node_test.js')
exec
execTest('eu-west-1:584172ba-6a82-248a-4162-cyac56119052/secondary/node_test.js')
split
splitTest('eu-west-1:584172ba-6a82-248a-4162-cyac56119052/secondary/node_test.js')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
substring
replace
exec
split

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/88.0.4324.146 Safari/537.36

Browser/OS: Chrome 88 on Windows

View result in a separate tab

Test name	Executions per second
substring	5125432.5 Ops/sec
replace	3191086.5 Ops/sec
exec	3982049.8 Ops/sec
split	1737432.4 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what is being tested.

**Benchmark Definition**

The benchmark definition contains four JavaScript functions: `substringTest`, `replaceTest`, `execTest`, and `splitTest`. These functions are designed to test specific string manipulation operations. Here's a brief description of each:

1. `substringTest(str)`: This function tests the lastIndexOf method's substring behavior.
2. `replaceTest(str)`: This function tests the replace method's functionality, specifically removing certain characters from the start of a string.
3. `execTest(str)`: This function tests the exec method's usage with a regular expression.
4. `splitTest(str)`: This function tests the split method's behavior when dealing with escaped and forward slashes.

**Options being compared**

The benchmark is comparing different approaches for each operation:

1. **Substring**: The original implementation (`substringTest`) vs. the V8 JavaScript engine's optimized implementation (implied by the benchmark's output).
2. **Replace**: The original implementation (`replaceTest`) vs. the V8 JavaScript engine's optimized implementation.
3. **Exec**: The original implementation (`execTest`) vs. the V8 JavaScript engine's optimized implementation.
4. **Split**: The original implementation (`splitTest`) vs. the V8 JavaScript engine's optimized implementation.

**Pros and Cons**

Each approach has its pros and cons:

1. **Substring**:
	* Original implementation: May be slower due to unnecessary string indexing.
	* Optimized implementation (V8): Likely faster, but may also introduce side effects or changes to the original logic.
2. **Replace**:
	* Original implementation: May be slower due to unnecessary character checking.
	* Optimized implementation (V8): Likely faster, but may also introduce side effects or changes to the original logic.
3. **Exec**:
	* Original implementation: May be slower due to the complexity of regular expressions.
	* Optimized implementation (V8): Likely faster, as V8's regex engine is highly optimized.
4. **Split**:
	* Original implementation: May be slower due to unnecessary string processing.
	* Optimized implementation (V8): Likely faster, but may also introduce side effects or changes to the original logic.

**Library usage**

The benchmark does not appear to use any external libraries, except for:

1. **Regular expressions**: The `execTest` function uses a regular expression, which is part of the JavaScript standard library.
2. **String methods**: All functions use string methods like lastIndexOf, replace, exec, and split, which are also part of the JavaScript standard library.

**Special JS features**

The benchmark does not appear to utilize any special JavaScript features or syntax beyond what's available in modern JavaScript engines (ECMAScript).

**Other alternatives**

To measure these operations, alternative approaches could be considered:

1. **Manual loops**: Writing custom loops using native code could potentially outperform the optimized implementations.
2. **Other string manipulation libraries**: Using a dedicated library like `lodash` or `String.prototype` methods could offer alternative solutions for string manipulation.
3. **Just-In-Time (JIT) compilation**: Compiling the JavaScript functions to native machine code using a JIT compiler could lead to further performance improvements.

Keep in mind that benchmarking is an art, and the results may vary depending on the specific use case, hardware, and software configurations.

Related benchmarks:

Path test (version: 0)

Test for paths...

Comparing performance of: substring vs replace vs exec vs split

Created: 3 years ago by: Guest

Jump to the latest result

substring

replace

exec

split

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):