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indexOf vs. match
(version: 0)
Comparing performance of:
indexOf vs match
Created:
4 years ago
by:
Guest
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Script Preparation code:
var str = "https://www.measurethat.net/Benchmarks/Add";
Tests:
indexOf
str.indexOf("/Add") === str.length - 4
match
str.match(/\/Add$/)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
indexOf
match
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON benchmark data and explain what's being tested. **Benchmark Definition** The `Benchmark Definition` is a string that represents the JavaScript code being executed in each test case. This code snippet performs two operations: `indexOf` and `match`. * `str.indexOf(" /Add") === str.length - 4`: This line checks if the index of "/Add" within the string "https://www.measurethat.net/Benchmarks/Add/" is equal to the length of the string minus 4. The space before "/Add" in the string affects the result because JavaScript uses a non-greedy (`*`) search by default when no specific greedy character (like `+`, `{`, or `?`) is used. * `str.match(/\\/Add$/)`: This line searches for the regular expression `/\\/Add$/` at the end of the string "https://www.measurethat.net/Benchmarks/Add/", ensuring the pattern includes a forward slash and ends with "/Add". **Options Compared** The two methods being compared are: 1. `indexOf()`: A built-in JavaScript function that returns the index of a specified value within a string. 2. `match()`: A built-in JavaScript function that searches for a match in a string using a regular expression. **Pros and Cons** * **`indexOf()`**: Pros: * Generally faster due to its lower overhead * Suitable for simple, linear search patterns (which is the case here with just a slash) * Cons: * Requires exact match; no flexibility in searching for patterns within the string. * May be slower when dealing with complex patterns or strings of varying lengths. * **`match()`**: Pros: + Offers more control and flexibility with regular expressions + Can handle more complex search patterns (with capture groups, etc.) * Cons: * Generally slower due to its additional overhead for parsing the regex. * May lead to false positives if not used correctly. **Library Usage** There is no library explicitly mentioned in this benchmark definition. However, regular expressions are a standard JavaScript feature and don't require an external library. **Special JS Features or Syntax (Optional)** The provided benchmarks utilize built-in JavaScript methods (`indexOf()` and `match()`) without any special features or syntax beyond those available to all modern browsers. **Alternatives** Some alternatives could be: 1. **Other string manipulation functions**: Depending on the specific requirements of your project, other functions like `includes()`, `startsWith()`, `endsWith()`, or even custom implementations using a loop might be more suitable. 2. **Regular expression libraries (if needed)**: If you're dealing with complex patterns that aren't covered by built-in JavaScript regex features, consider using a library like [RegExjs](https://regexjs.com/) for better control and performance. In this specific case, since the operations are relatively simple and don't require advanced regex or string manipulation capabilities, sticking with built-in JavaScript methods is likely sufficient.
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