Benchmark: regex or lowercase

Script Preparation code:

var matriculas = [];
var withoutZero = [];
for (var i = 0; i < 3; i++) {
    matriculas.push({situacao: 'ATIVO'})
}

Tests:

regex
const matriculaValida = matriculas.find((matricula) => /^ativo/i.test(matricula.situacao));
lowercase
const matriculaValida = matriculas.find((matricula) => matricula.situacao.toLowerCase() === 'ativo');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
regex
lowercase

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 JSON and explain what's being tested, compared, and considered.

**Benchmark Definition**

The benchmark definition represents a JavaScript function that will be executed multiple times to measure its performance. In this case, there are two benchmarks:

1. **"regex or lowercase"`: This benchmark definition contains a script preparation code that creates an array of objects (`matriculas`) with a property `situacao` set to `'ATIVO'`. The Html Preparation Code is empty.
2. **"lowercase"` and **"regex"`**: These are individual test cases within the benchmark definition. They contain a function call that finds the first element in the `matriculas` array where the condition is met.

**Test Cases**

There are two test cases:

1. **"regex"`: This test case uses a regular expression (`^ativo/i`) to search for the string `'ativo'` in the `situacao` property of each object in the `matriculas` array.
2. **"lowercase"`: This test case converts the `situacao` property of each object in the `matriculas` array to lowercase using the `toLowerCase()` method and then checks if it equals `'ativo'`.

**Comparison**

The two test cases are compared in terms of their performance, measured by the number of executions per second.

**Options Compared**

1. **Regex**: The regular expression approach uses a built-in JavaScript function (`/^\w+$/i.test(matricula.situacao)` is not used instead `^ativo/i` ) to search for the string `'ativo'`. This method can be slower due to the overhead of parsing and compiling the regular expression.
2. **Lowercase**: The lowercase approach converts the string to lowercase before comparison, which can reduce the number of comparisons needed.

**Pros and Cons**

1. **Regex**: Pros: Regular expressions are flexible and powerful for pattern matching. Cons: They can be slower due to compilation overhead.
2. **Lowercase**: Pros: This method is faster since it reduces the number of comparisons needed. Cons: It may not work correctly if the string cannot be converted to lowercase.

**Library**

There is no specific library mentioned in this benchmark, but the `find()` method used in both test cases is a built-in JavaScript method that searches for an element within an array.

**Special JS Feature or Syntax**

None of the code uses any special JavaScript features or syntax. The regular expression and string comparison methods are standard JavaScript constructs.

**Other Alternatives**

If you wanted to improve performance, you could consider:

1. Using a faster string comparison algorithm like `===` instead of `toLowerCase()` + `===`.
2. Compiling the regular expression beforehand to reduce parsing overhead.
3. Using a dedicated library for regex optimization or string manipulation.
4. Optimizing the data structure and indexing used in the search operation.

Keep in mind that the best approach depends on the specific use case, data characteristics, and performance requirements.

Related benchmarks:

regex or lowercase (version: 0)

Comparing performance of: regex vs lowercase

Created: 3 years ago by: Guest

Jump to the latest result

regex

lowercase

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):