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slice substr substring
(version: 0)
Comparing performance of:
slice vs susbtr vs susbtring
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
a = 'somerandomstringwhocaresreally';
Tests:
slice
a.slice(0,10)
susbtr
a.substr(0,10)
susbtring
a.substr(0,10)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
slice
susbtr
susbtring
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 data and explain what is being tested, compared, and their pros and cons. **Benchmark Definition** The benchmark is testing three JavaScript methods: `slice()`, `substr()`, and `substring()` on the same string variable `a`. The goal is to compare the execution time of these three methods for a specific substring extraction task. **Options Compared** 1. **`slice()`**: This method extracts a specified number of characters from the beginning of a string. It's known for being efficient in modern JavaScript engines. 2. **`substr()`**: This method also extracts a specified number of characters from the beginning of a string, but it has some differences compared to `slice()`. It's older and less efficient than `slice()`. 3. **`substring()`**: Similar to `substr()`, this method extracts a specified number of characters from the beginning of a string. However, unlike `substr()`, it allows you to specify a start index, making it more flexible. **Pros and Cons** 1. **`slice()`**: * Pros: Fastest execution time among the three methods. * Cons: Requires a fixed length substring, which might not be suitable for all use cases. 2. **`substr()`**: * Pros: Still widely used due to its simplicity. * Cons: Less efficient than `slice()`, with slower execution times. 3. **`substring()`**: * Pros: More flexible than `substr()` since it allows specifying a start index, but still relatively slow compared to `slice()`. * Cons: Less efficient than `slice()` due to the additional overhead of checking if the start index is valid. **Library Usage** None of the provided benchmark tests use external libraries. However, if you were to create similar benchmarks using these methods in real-world scenarios, you might need to consider using libraries like `lodash` for utilities that provide more concise alternatives to these methods. **Special JS Features or Syntax** There are no special JavaScript features or syntax mentioned in this benchmark. The tests only use standard JavaScript variables, literals, and operators. **Other Alternatives** If you're looking for alternative ways to extract substrings, you might consider: 1. **Regex**: Using regular expressions can be an efficient way to extract substrings, especially when working with complex patterns. 2. **String.prototype.replace()**: While not typically used for substring extraction, `replace()` can be used in conjunction with a regex pattern to achieve similar results. Keep in mind that these alternatives may have different performance characteristics and use cases compared to the standard methods tested in this benchmark. In summary, the benchmark tests three common JavaScript methods for extracting substrings: `slice()`, `substr()`, and `substring()`. While each method has its pros and cons, `slice()` generally emerges as the fastest option due to its simplicity and optimized implementation.
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