Benchmark: slice overhead - MeasureThat.net

Script Preparation code:

var test = "filessaldkjflaskdjflaskdjflaskdfj.d.ts"
var tail = ".d.ts"

Tests:

1
test.slice(-5) === ".d.ts"
2
test.slice(-tail.length).toLowerCase() === tail.toLowerCase()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
2

Fastest: N/A

Slowest: N/A

Latest run results:

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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.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided benchmark measures the overhead of using the `slice()` method in JavaScript.

**Script Preparation Code**

The script preparation code is:
```javascript
var test = "filessaldkjflaskdjflaskdjflaskdfj.d.ts";
var tail = ".d.ts";
```
This code defines two variables: `test` and `tail`. The purpose of these variables is to create a string that will be used for testing the `slice()` method.

**Html Preparation Code**

There is no html preparation code provided, which means that only JavaScript is being tested.

**Test Cases**

The benchmark has two test cases:

1. `"test.slice(-5) === ".d.ts"`: This test case creates a new string by slicing the `test` variable from the 6th character to the end and compares it with the string literal `.d.ts`. The goal is to measure how long it takes to create this new string.
2. `"test.slice(-tail.length).toLowerCase() === tail.toLowerCase()"`: This test case creates a new string by slicing the `test` variable from the length of the `tail` variable to the end, converts it to lowercase using the `toLowerCase()` method, and compares it with the lowercase version of the `tail` variable. The goal is to measure how long it takes to create this new string after applying additional processing.

**Library Use**

There is no explicit library use in these test cases. However, the `slice()` method is a built-in JavaScript function that belongs to the String prototype.

**Special JS Feature or Syntax**

The provided benchmark does not include any special JavaScript features or syntax that would require specific handling.

**Benchmark Results**

The latest benchmark results show two different execution rates for each test case:

1. `"test.slice(-5) === ".d.ts"`: Chrome 54 executed this test case approximately 9034962 times per second.
2. `"test.slice(-tail.length).toLowerCase() === tail.toLowerCase()"`: Chrome 54 executed this test case approximately 2785411 times per second.

**Other Alternatives**

If you wanted to write a similar benchmark, you could consider the following alternatives:

* Use a different method to create the string for testing, such as using template literals or the `String.prototype.repeat()` method.
* Test other methods that manipulate strings, such as `substring()`, `indexOf()`, or regular expressions.
* Consider adding more test cases to cover different scenarios, such as testing the performance of the `slice()` method with negative indices or on larger strings.

Keep in mind that the MeasureThat.net website provides a pre-configured benchmarking framework, so you wouldn't need to implement these alternatives yourself.

Related benchmarks:

slice overhead (version: 0)

Comparing performance of: 1 vs 2

Created: 9 years ago by: Guest

Jump to the latest result

1

2

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):