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RegEx vs For Loop4
(version: 0)
-
Comparing performance of:
RegEx vs For Loop
Created:
2 years ago
by:
Guest
Go to the latest result
HTML Preparation code:
var string = "passw)odas4gsdfsdf";
Script Preparation code:
var string = "passw)odas4gsdfsdf";
Tests:
RegEx
let isPasswordValid = false; const FORBIDDEN_CHARACTERS = [`<`, `>`, `&`, `$`]; for (const character of FORBIDDEN_CHARACTERS) { const position = input.data.indexOf(character); if (position !== -1) { return INVALID; } }
For Loop
const FORBIDDEN_CHARACTERS = [`<`, `>`, `&`, `$`]; const forbiddenRegex = new RegExp(`[${FORBIDDEN_CHARACTERS.join('')}]`); const match = forbiddenRegex.exec(string); if (match) { return INVALID; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
RegEx
For Loop
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
Browser/OS:
Chrome 120 on Linux
View result in a separate tab
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=507848" width="100%" height="500px"></iframe>
For Loop
3.3M/s
RegEx
0/s
View exact numbers
Test name
Executions per second
✓
For Loop
3,253,134 Ops/sec
RegEx
0 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the provided Benchmark Definition JSON and explain what's being tested. **Benchmark Overview** The benchmark is designed to compare two approaches for validating a password: using a `for` loop with character indexing or using regular expressions (RegEx). The goal is to determine which approach is faster, more efficient, and less resource-intensive. **Options Compared** Two options are being compared: 1. **For Loop**: This approach iterates through an array of forbidden characters using a traditional `for` loop. For each character, it checks if the input string contains that character at a specific position. 2. **RegEx**: This approach uses regular expressions to match one or more occurrences of the specified forbidden characters in the input string. **Pros and Cons** **For Loop:** Pros: * Easy to understand and implement for developers familiar with JavaScript's `for` loop syntax. * Can be optimized for specific use cases, such as using `indexOf()` method with caching. Cons: * May not perform well on large inputs due to the overhead of looping through each character individually. * Less efficient than RegEx in terms of CPU cycles and memory usage. **RegEx:** Pros: * More concise and expressive syntax for matching patterns. * Can be more efficient than a `for` loop, especially for complex patterns or large inputs. Cons: * Steeper learning curve due to the complexity of RegEx syntax. * May lead to performance issues if not optimized correctly (e.g., using `RegExp.prototype.exec()` with caching). **Library Used** The benchmark uses the built-in JavaScript `RegExp` library, which provides regular expression matching capabilities. The RegEx pattern used in the benchmark is a simple one, matching any of the forbidden characters (`<`, `>`, `&`, `$`) directly. **Special JS Feature/Syntax** There are no special JavaScript features or syntax mentioned in the benchmark definition or individual test cases. However, it's worth noting that the benchmark uses JavaScript 8+ syntax and assumes a modern browser environment. **Other Alternatives** Other approaches for validating passwords could include: * Using a `String.prototype.includes()` method with caching. * Implementing a custom algorithm using bitwise operations or character lookup tables. * Utilizing browser-specific features, such as WebAssembly or native modules (e.g., `nacl-regex`). Keep in mind that the choice of approach depends on the specific requirements and constraints of your application. The benchmark provided by MeasureThat.net offers a good starting point for comparing performance differences between these two approaches.
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