Benchmark: regex vs strict equality vs endWith

Script Preparation code:

var infinityRegex = /^-?infinity$/;
var values = ['infinity', '-infinity', 'test', '-infinityqzd', 'infini'];

Tests:

regex
values.some(value => infinityRegex.test(value))
equality
values.some(value => (value === 'infinity' || value === '-infinity'));
endsWith
values.some(value => value.endsWith('infinity'))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
regex
equality
endsWith

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark is comparing three different approaches to check if a value matches a certain condition:

1. `regex`: Using a regular expression (`/^-?infinity$/`) to match values against a pattern.
2. `equality`: Directly comparing values using strict equality (`value === 'infinity' || value === '-infinity'`).
3. `endsWith`: Checking if a value ends with a specific string (`value.endsWith('infinity')`).

**Options Compared**

The benchmark is testing three different approaches:

* `regex`: Using regular expressions to match values against a pattern.
* `equality`: Directly comparing values using strict equality.
* `endsWith`: Checking if a value ends with a specific string.

**Pros and Cons of Each Approach**

1. **Regex**:
	* Pros: Can be very powerful for complex matching patterns, flexible, and concise way to check multiple conditions.
	* Cons: Can be slow, error-prone, and may have issues with edge cases or non-ASCII characters.
2. **Equality**:
	* Pros: Fast, simple, and clear way to compare values.
	* Cons: May not work as expected for strings that contain special characters, non-ASCII characters, or edge cases.
3. **endsWith**:
	* Pros: Fast, efficient, and straightforward way to check if a value ends with a specific string.
	* Cons: Only works for strings; may not be suitable for other data types.

**Library Usage**

There is no explicit library usage in this benchmark. However, the `String.prototype.endsWith` method is used in the `endsWith` test case.

**Special JS Features or Syntax**

There are no special JavaScript features or syntax mentioned in the benchmark definition or individual test cases.

**Other Considerations**

When choosing an approach, consider the following factors:

* **Performance**: Regex can be slower due to the complexity of regular expression matching. Equality and `endsWith` methods are generally faster.
* **Complexity**: If you need to match complex patterns or conditions, regex might be a good choice. For simple checks, equality or `endsWith` might be more suitable.
* **Edge Cases**: When working with strings that contain special characters or non-ASCII characters, equality and `endsWith` methods may not work as expected.

**Alternatives**

If you're considering alternatives to these approaches:

* For regex, you could consider using a library like `regexjs` for improved performance and readability.
* For equality checks, you might want to explore using a library like `lodash` that provides efficient string comparison methods.
* For `endsWith`, if you need to check strings against multiple patterns, regex might be a better choice.

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:104.0) Gecko/20100101 Firefox/104.0

Browser/OS: Firefox 104 on Linux

View result in a separate tab

Test name	Executions per second
regex	21308618.0 Ops/sec
equality	444649344.0 Ops/sec
endsWith	25000238.0 Ops/sec

Related benchmarks:

regex vs strict equality vs endWith (version: 0)

Comparing performance of: regex vs equality vs endsWith

Created: 7 years ago by: Guest

Jump to the latest result

regex

equality

endsWith

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):