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Split string vs. regex
(version: 0)
Benchmark.js
Comparing performance of:
string vs regex
Created:
2 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var a = 'dynamicProduct:abc';
Tests:
string
console.log(a.split(':'))
regex
console.log(a.split(/:(?![^{]*})/g))
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
string
regex
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/120.0.0.0 Safari/537.36
Browser/OS:
Chrome 120 on Mac OS X 10.15.7
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=497619" width="100%" height="500px"></iframe>
regex
339K/s
string
337K/s
View exact numbers
Test name
Executions per second
✓
regex
339,228 Ops/sec
string
337,144 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what's being tested in the provided benchmark. **Benchmark Definition** The benchmark is designed to compare two approaches for splitting a string: 1. `split(':')` 2. `split(/:(?![^{]*})/g)` **What are we comparing?** We're comparing the performance of these two approaches: * **Literal Split**: The first approach uses the literal `:` character as the separator to split the string. * **Regular Expression (Regex) Split**: The second approach uses a regular expression (`/(:(?![^{]*})/g)/`) that matches the `:` character only if it's not followed by zero or more characters (`[^]*`). This is a negative lookahead assertion. **Pros and Cons** ### Literal Split Pros: * Simple and easy to understand * Fast, since it doesn't require parsing regular expressions * Works well for simple string splitting tasks Cons: * May not work correctly if the separator character has special meaning in the context (e.g., `:` is used as a delimiter in an array) ### Regex Split Pros: * More flexible and powerful than literal split, can handle complex separator logic * Can be used to extract specific parts of the string based on pattern matching Cons: * Slower due to the overhead of parsing regular expressions * More prone to errors if the regex is not well-defined or edge cases are not handled properly **Other Considerations** * The test assumes that the input string `a` contains a `:` character, which may not always be the case. Handling this scenario might require additional logic. * The `(?![^{]*})` part in the regex ensures that the separator is not followed by any characters (including newline). If this is not the desired behavior, it can be adjusted. **Library and Special JS Feature** Neither of the approaches relies on a specific library or special JavaScript feature. However, if you were to modify the test to use more advanced string manipulation methods (e.g., `String.prototype.split()` with options), that would involve additional libraries or features not present in this benchmark. **Alternatives** Some alternative approaches for splitting strings include: * Using an external library like `lodash` which provides a robust and flexible way to split strings * Using a more modern JavaScript feature like template literals (`${separator}${string}`) to avoid string concatenation altogether * Implementing a custom string splitting function with iteration or using a data structure like a trie for efficient lookup These alternatives would require changes to the benchmark setup, but they could provide additional insights into performance and efficiency under different scenarios.
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