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slice vs substr vs substring (with end index)
(version: 0)
Compares slice, substr and substring to each other when there is and a end index
Comparing performance of:
slice vs substr vs substring
Created:
7 years ago
by:
Guest
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Script Preparation code:
var example = 'there is no spoon'
Tests:
slice
var result = example.slice(10, -1)
substr
var result = example.substr(10, example.length-1)
substring
var result = example.substring(10, example.length-1)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
slice
substr
substring
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the benchmarking results and explanations. The provided JSON represents a JavaScript microbenchmark that compares three methods for extracting a substring from a string: `slice`, `substr`, and `substring`. These methods are part of the JavaScript String prototype, and they have some differences in their behavior and performance. **What is tested?** The test cases measure the execution time of each method on the same input string (`example = 'there is no spoon'`) with different start and end indices. The start index is fixed at 10, while the end index varies: * `slice(10, -1)`: extracts a substring starting from index 10 to the last character. * `substr(10, example.length-1)`: extracts a substring starting from index 10 to the second-to-last character (because the `-1` is inclusive). * `substring(10, example.length-1)`: also extracts a substring starting from index 10 to the second-to-last character. **Options compared** The benchmark compares three methods: * `slice()`: uses the `slice()` method with two arguments: `start` and `end`. * `substr()`: uses the `substr()` method with two arguments: `start` and `length`. * `substring()`: uses the `substring()` method with two arguments: `start` and `length`. **Pros and Cons of each approach** 1. **slice()**: This method is concise and easy to read, but it's not as efficient as the other two methods because it creates a new string object. * Pros: easy to use, readable code * Cons: inefficient, creates a new string object 2. **substr()**: This method is also concise and easy to use, but it can lead to incorrect results if the `length` parameter is not provided correctly. * Pros: easy to use, fast execution * Cons: incorrect behavior if `length` is not specified, relies on implicit behavior that's not clearly documented 3. **substring()**: This method is more verbose than the other two but provides clear and explicit control over the start and end indices. * Pros: explicit control, efficient execution * Cons: more verbose code **Library usage** None of the methods use a library or any external dependencies. **Special JavaScript feature or syntax** There are no special JavaScript features or syntaxes used in this benchmark. The focus is on comparing the performance of the three string extraction methods. **Other alternatives** If you're looking for alternative ways to extract substrings from strings, you might consider using: * `indexOf()` and `slice()`: use `indexOf()` to find the start index and then use `slice()` to extract the substring. * Regular expressions: use a regular expression with a capturing group to extract the desired substring. In summary, the benchmark highlights the differences in performance and behavior between `slice()`, `substr()`, and `substring()` when extracting substrings from strings. The results indicate that `substring()` is likely the fastest and most efficient method, while `substr()` can lead to incorrect behavior if not used carefully.
Related benchmarks:
slice vs substr vs substring with end
slice vs substr vs substring (with negative index)
slice vs substring (with no end index)
slice vs substring (with end index)
slice vs substr vs substrings
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