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split vs regex222
(version: 0)
Comparing performance of:
split vs regex
Created:
6 years ago
by:
Guest
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Tests:
split
const eventSelectorRegex = /\[(#|\.)[a-zA-Z0-9_-]+\]/; let item = '@mousemove.clientX[.sidenav]'; let arr = item.substr(1).split('.'); let eventName = arr[0]; let eventPropName = arr[1]; let selector = eventPropName.match(eventSelectorRegex);
regex
const eventSelectorRegex = /\[(#|\.)[a-zA-Z0-9_-]+\]/; let item = '@mousemove.clientX[.sidenav]'; let arr = item.substr(1).split('.'); let eventName = arr[0]; let eventPropName = arr[1]; let selector = eventPropName.match(eventSelectorRegex);
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Suite status:
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Test case name
Result
split
regex
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Slowest:
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Autogenerated LLM Summary
(model
gemma2:9b
, generated one year ago):
This benchmark compares two methods for extracting information from a string representing an event selector: **Method 1: `split()`** * The code uses the `.substr(1).split('.')` method to break down the string `'@mousemove.clientX[.sidenav]'`. The `substr(1)` part removes the leading '@', and then `.split('.')` splits the remaining string at every occurrence of '.' into an array. This array is then used to extract the event name (`eventName`) and the property name (`eventPropName`). * **Pros:** * Relatively simple and easy to understand. * Widely known and supported by all JavaScript engines. * **Cons:** * Can be inefficient if the string contains many '.' characters that are not part of the intended structure. * May require additional logic to handle cases where '.' has a different meaning within the string (e.g., in an actual property name). **Method 2: Regular Expression (`match()`)** * The code uses a regular expression `eventSelectorRegex` to match a specific pattern within the string. This regex looks for square brackets containing either '#' or '.' followed by alphanumeric characters and underscores. The `match()` method returns an array containing the matched substring. * **Pros:** * More precise control over the extraction process. * Can handle more complex patterns and edge cases. * Potentially more efficient if the string structure is well-defined and matches the regex pattern. * **Cons:** * Regular expressions can be complex to write and debug. * May be less performant than `split()` for simple cases, especially if the regular expression is complex. **Other Considerations:** * The specific performance differences between these methods will depend on factors such as the string length, complexity of the pattern, and the JavaScript engine being used. * **Alternatives:** * Parsing libraries like `acorn` or `estraverse` could be used to parse the string more intelligently, depending on the specific context and requirements. Let me know if you have any other questions!
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