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substring vs slice
(version: 0)
Comparing performance of:
substring vs slice
Created:
5 years ago
by:
Guest
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Tests:
substring
let str= "name, phone, address, zip, "; let newStr = str.substring(0, str.length - 1);
slice
let str= "name, phone, address, zip, "; let newStr = str.slice(0, -2);
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
substring
slice
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided benchmark and explain what's being tested, compared, and other considerations. **Benchmark Definition** The test compares two ways to extract substrings from a string in JavaScript: `substring` and `slice`. **Options Being Compared** 1. **`substring`**: This method takes three arguments: the starting index, the ending index (exclusive), and an optional number of occurrences. In this benchmark, it's used to extract all but the last character (`str.length - 1`) from the input string. 2. **`slice`**: This method also takes two arguments: the start index and the end index (inclusive). It returns a new string with the specified characters. **Pros and Cons** * `substring`: + Pros: It's a more intuitive way to extract substrings, as it clearly separates the starting and ending indices. + Cons: It can be slower due to the extra argument (occurrences) being parsed. * `slice`: + Pros: It's often faster than `substring`, especially when dealing with long strings or performance-critical code. + Cons: The syntax can be less intuitive for some developers, as it requires concatenating indices (`-2`) instead of explicitly specifying the length. **Other Considerations** * Performance differences between `substring` and `slice` are often negligible unless you're working with extremely large datasets. However, if speed is crucial, `slice` might offer a slight advantage. * Both methods return new strings; neither modifies the original input string. **Library** None of these benchmarking tests rely on specific libraries beyond the built-in JavaScript `String` prototype methods (`substring`, `slice`). **Special JS Features or Syntax** There are no special features or syntax mentioned in this benchmark. It only uses standard JavaScript concepts and methods. **Other Alternatives** If you need to extract substrings from a string, alternative approaches include: 1. Using regular expressions (e.g., with the `match()` method). 2. Employing more advanced string manipulation techniques (e.g., using arrays or other data structures). 3. Leveraging library functions like those provided by `lodash` or `underscore`, which offer optimized substring extraction methods. In summary, this benchmark compares two common ways to extract substrings from a JavaScript string: `substring` and `slice`. While both methods have their pros and cons, the performance difference is typically negligible unless dealing with extremely large datasets.
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