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substr vs substring
(version: 0)
Comparing performance of:
substr vs substring
Created:
5 years ago
by:
Guest
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Tests:
substr
"#test-node".substr(1)
substring
"#test-node".substring(1)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
substr
substring
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 what's being tested in this benchmark. The test is comparing two JavaScript methods: `substr` and `substring`. Both methods are used to extract a subset of characters from a string. **What are the methods doing?** - `substr` extracts a specified number of characters from the beginning or end of a string. - `substring` extracts a specified range of characters from a string, i.e., it can start from any position in the string and extract until the specified length is reached. The goal of this benchmark is to determine which method is faster for common use cases. **Options compared:** In this case, there's only one option being tested against another option: `substr` vs `substring`. The two methods are designed to serve slightly different purposes but can also be used interchangeably in many situations. Pros and Cons: - **Substr**: Pros: - More concise and arguably more readable. - Does not specify the start index, which could lead to fewer errors when working with arrays or strings that have a fixed length. Cons: - Can't always be used as it's often better suited for use at the end of a string. - **Substring**: Pros: - More flexible as you can pick any starting point from the original string. Cons: - May look less readable in some cases and could lead to more errors. Other considerations: In many JavaScript environments, `substr` is faster than `substring`. However, it's worth noting that this might not hold true for all browsers or versions. **Library usage:** Neither `substr` nor `substring` uses any specific JavaScript library, so they can be used in a variety of contexts. **Special JS feature/syntax:** Neither method makes use of any special JavaScript features like async/await, destructuring, etc. Alternative methods for extracting substrings or parts from strings could include: 1. **Slicing**: Similar to `substring`, but without the "range" parameter (e.g., `string.slice(5)`). 2. **Array Splice and concat()**: This is an older method that would involve changing your string into an array, using `splice` for removal of part(s) from the end or beginning, then appending back to the string. However, this would be extremely inefficient. 3. **Regular Expressions:** For some cases, especially if you have a fixed length and need all occurrences in the entire string (e.g., extracting every 4th character), regular expressions might be useful. In conclusion, `substr` and `substring` are both methods for extracting substrings or parts from strings in JavaScript. The choice between them usually comes down to whether you want more flexibility over where your extraction starts (`substring`) or a more concise way that still works well with fixed-length extractions at the end of the string (`substr`).
Related benchmarks:
Performance Test: substring vs substr vs slice constant length
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Performance Test: substring vs substr vs slice 1
slice vs substr vs substring (only start index)
Performance Test: substring vs substr (remove last 10 chars)
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