Benchmark: Substr test - MeasureThat.net

Script Preparation code:

var key = 'sacrament15df30e1693b4646af1ac4e9cdbf500f';

Tests:

substr
key.toLowerCase().substr(0, "sacrament".length) === "sacrament";
index
key.toLowerCase().indexOf('sacrament') === 0;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
substr
index

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.

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

**Benchmark Overview**

The benchmark, titled "Substr test", consists of two individual test cases: "substr" and "index". The tests are designed to measure the performance of the `substr` and `indexOf` methods in JavaScript.

**Script Preparation Code**

The script preparation code is a variable declaration that sets a string value for a constant named `key`. This line is executed only once before running the benchmark:

```javascript
var key = 'sacrament15df30e1693b4646af1ac4e9cdbf500f';
```

**Html Preparation Code**

There is no HTML preparation code, which means that this benchmark does not execute any JavaScript code in a browser environment.

**Test Cases**

The two test cases are defined as follows:

1. **"substr"`**
	* The benchmark definition checks if the result of calling `key.toLowerCase().substr(0, "sacrament".length)` is equal to `"sacrament"`.
	* This test case is likely testing the performance of the `substr` method in a string.
2. **"index"`**
	* The benchmark definition checks if the result of calling `key.toLowerCase().indexOf('sacrament')` is equal to 0.
	* This test case is likely testing the performance of the `indexOf` method in a string.

**Library**

There are no external libraries used in this benchmark. Both `substr` and `indexOf` methods are built-in JavaScript methods that do not require any additional dependencies.

**Special JS Features/Syntax**

There are no special JS features or syntax being tested in these benchmark cases. However, the use of template literals (`"sacrament".length`) is a modern JavaScript feature introduced in ECMAScript 2015 (ES6). If you're using an older version of JavaScript that doesn't support this feature, you may need to modify the benchmark code.

**Other Alternatives**

If you were to write similar benchmarks for other string methods, some alternatives could be:

* `slice`: This method can be used as a replacement for `substr` in some cases.
* `localeCompare`: This method can be used for comparing strings in a locale-aware manner.
* `replace`: This method can be used for searching and replacing substrings.

**Pros and Cons of Different Approaches**

Here's a brief summary of the pros and cons of each approach:

* **`substr`**:
	+ Pros: Simple, efficient, and widely supported.
	+ Cons: Can be slow for large strings due to its iterative nature.
* **`indexOf`**:
	+ Pros: Fast, efficient, and widely supported.
	+ Cons: May not work correctly in certain edge cases (e.g., null or undefined strings).
* **`slice`**:
	+ Pros: Efficient, flexible, and modern.
	+ Cons: Less intuitive for beginners, may require additional knowledge of array methods.
* **`localeCompare`**:
	+ Pros: Locale-aware, efficient, and modern.
	+ Cons: May not be supported in older browsers or environments.

Keep in mind that the choice of method depends on the specific use case, performance requirements, and compatibility considerations.

Related benchmarks:

Substr test (version: 0)

Comparing performance of: substr vs index

Created: 9 years ago by: Guest

Jump to the latest result

substr

index

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):