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slice vs substr vs substring vs split
(version: 0)
Compares slice, subst, substring and split to each other
Comparing performance of:
slice vs substr vs substring vs split
Created:
6 years ago
by:
Guest
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Script Preparation code:
var example = 'en-GB'
Tests:
slice
var result = example.slice(0,2)
substr
var result = example.substr(0,2)
substring
var result = example.substring(0,2)
split
var result = example.split('-', 1)[0]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
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Test case name
Result
slice
substr
substring
split
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
gemma2:9b
, generated one year ago):
This benchmark compares four different ways to extract the first two characters from the string "en-GB": * **`slice(0, 2)`**: This method creates a new string containing a portion of the original string, starting at index 0 (the beginning) and going up to, but not including, index 2. * **`substr(0, 2)`**: Similar to `slice`, this method also extracts a substring from the original string. It takes two arguments: the starting position (index 0 in this case) and the length of the substring (2 characters). * **`substring(0, 2)`**: This method behaves identically to `substr`. Both are commonly used for extracting substrings based on start index and length. * **`split('-', 1)[0]`**: This method uses the `split()` function to divide the string at each hyphen (`-`). The second argument (1) limits the split to a maximum of one occurrence. Finally, it selects the first element (index 0) from the resulting array. This approach is less direct than the others but can be useful in situations where you need to work with parts of a delimited string. **Pros and Cons:** * **`slice`, `substr`, `substring`**: These methods are generally faster for simple substring extraction because they directly manipulate the string without creating new arrays. * **`split`**: While potentially slower for this specific task, `split` is more versatile. It can be used to extract multiple parts of a string based on delimiters and offers more control over how the string is divided. **Alternatives:** If performance is paramount for simple substring extraction, consider these alternatives: * **String Methods (like `substr`)**: These methods are optimized for speed and efficiency. * **Regular Expressions**: If you need to extract substrings based on patterns rather than fixed positions, regexes can be powerful but often have a performance penalty compared to direct string manipulation methods.
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