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Regex testing for whitespace vs trim
(version: 0)
Comparing performance of:
regex vs trim
Created:
5 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var string = ' '; var regPattern = new RegExp(/\A\s*\z/g);
Tests:
regex
regPattern.test(string)
trim
string.trim().length === 0
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
regex
trim
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36
Browser/OS:
Chrome 122 on Mac OS X 10.15.7
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<iframe src="https://measurethat.net/Embed?id=513667" width="100%" height="500px"></iframe>
trim
22.4M/s
regex
13.6M/s
View exact numbers
Test name
Executions per second
✓
trim
22,432,358 Ops/sec
regex
13,625,882 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested, compared, and their pros and cons. **Benchmark Overview** The benchmark is designed to compare the performance of two approaches: using regular expressions (regex) to test for whitespace characters versus using the `trim()` method. **Script Preparation Code** The script preparation code defines a string variable `string` containing only whitespace characters (`" \t \t \t "`). It also creates a regex pattern `regPattern` that matches one or more whitespace characters (`/\\A\\s*\\z/g`) from the start (`\\A`) to the end (`\\z`) of the string. **Html Preparation Code** There is no HTML preparation code provided, which means that the benchmark only tests the JavaScript code. **Test Cases** The benchmark consists of two test cases: 1. **regex**: This test case runs the `regPattern.test(string)` expression, which attempts to match the regex pattern against the input string. 2. **trim**: This test case runs the expression `string.trim().length === 0`, which removes all whitespace characters from the input string and checks if the resulting length is 0. **Comparison** The benchmark compares the performance of these two approaches: * Using regex to test for whitespace characters (`regex` test case) * Using the `trim()` method to remove whitespace characters (`trim` test case) **Pros and Cons** Here's a brief analysis of each approach: ### Regex Approach (`regex` test case) Pros: * Can be more flexible, as it can match various types of whitespace characters (e.g., tabs, newline characters). * Can be used for other purposes beyond just checking for whitespace. Cons: * Typically slower than the `trim()` method due to the overhead of compiling and executing a regex pattern. * More complex and harder to read for simple use cases. ### Trim Approach (`trim` test case) Pros: * Faster, as it relies on a built-in JavaScript method that has been optimized for performance. * Easier to read and understand, as it's a straightforward operation. Cons: * May not be suitable for all scenarios, such as when working with non-ASCII characters or requiring more advanced whitespace matching capabilities. **Library Usage** The `trim()` method uses the built-in JavaScript String.prototype.trim() method, which is implemented in V8 (the JavaScript engine used by Google Chrome). **Special JS Features/Syntax** There are no special features or syntax used in this benchmark that would require specific knowledge of JavaScript beyond what's discussed above. **Other Alternatives** If you wanted to compare the performance of different approaches to remove whitespace characters, other alternatives might include: * Using a string manipulation library like String.prototype.replace() with a regex pattern. * Implementing a custom whitespace removal function using loops and conditional statements. * Utilizing a regular expression with a specific syntax, such as `\s+` or `[^\S]`, which may be more efficient than the `trim()` method for certain use cases. Keep in mind that these alternatives would require additional code and analysis to determine their performance characteristics.
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