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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);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
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Test case name
Result
split
regex
Fastest:
N/A
Slowest:
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Autogenerated LLM Summary
(model
llama3.1:latest
, generated one year ago):
Let's dive into the benchmark details. **Benchmark Definition** The benchmark is called "split vs regex222". It compares two approaches to parsing a specific string format: using JavaScript's built-in `split()` method versus using regular expressions (`regex`) for matching and extracting substrings. **Test Cases** There are two test cases: 1. **Split**: This test uses the `split()` method to parse the string `'@mousemove.clientX[.sidenav]'`. It extracts the event name (`'mousemove'`) and event property name (`'clientX'`). 2. **Regex**: This test uses a regular expression `/\\[(#|\\.)[a-zA-Z0-9_-]+\\]/` to match and extract the event selector from the same string. The resulting matches are then used to assign values to `eventName` and `eventPropName`. **Library/Feature** There is no external library used in this benchmark. **JavaScript Features/Syntax** The regular expression `/\\[(#|\\.)[a-zA-Z0-9_-]+\\]/` uses some advanced features: * The backslash (`\`) at the start of the pattern escapes the opening square bracket (`[`), which has a special meaning in regex. * `(#|\\.)` matches either an octothorpe (`#`) or a period (`.`) followed by one or more word characters (`[a-zA-Z0-9_-]+`) and closing square bracket (`]`). * The `+` quantifier matches one or more occurrences of the preceding character class. * The `\\[` is used to match a literal opening square bracket. **Pros/Cons** The two approaches have different trade-offs: * **Split**: This method is simple, easy to understand, and efficient. However, it requires knowledge of the exact string format being parsed, which might limit its flexibility. * **Regex**: Regular expressions can be more powerful and flexible than `split()`, allowing for complex pattern matching and extraction. However, they can also be less readable, require more expertise, and potentially slower due to the overhead of regex engine compilation. **Alternatives** Other alternatives to consider: * Using a dedicated string parsing library or utility (e.g., `parse-expr` or `json-stringify`) that provides a high-level API for extracting structured data from strings. * Implementing custom logic using JavaScript's built-in functions, such as `split()`, `match()`, and `exec()`, to handle specific use cases. **Benchmark Results** The latest benchmark results show: * The Regex approach executes at approximately 754602.75 times per second on Chrome 80 (Desktop, Windows). * The Split approach executes at approximately 802437.0 times per second on the same configuration. Keep in mind that these results are specific to this particular benchmark and might not generalize to other use cases or environments.
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