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substr vs slice vs substring
(version: 0)
Comparing performance of:
substr vs slice vs substring
Created:
2 years ago
by:
Guest
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Tests:
substr
Math.random().toString(20).substr(2, 6)
slice
Math.random().toString(20).slice(2, 6)
substring
Math.random().toString(20).substring(2, 6)
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Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
substr
slice
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 the provided benchmark and explain what's being tested, compared, and discussed. **Benchmark Purpose:** The benchmark measures the performance differences between three string manipulation methods in JavaScript: 1. `substr()` 2. `slice()` 3. `substring()` These methods are used to extract a portion of a string. **Comparison Options:** The benchmark compares the execution speed of these three methods on different input strings, specifically `Math.random().toString(20).substr(2, 6)`, `Math.random().toString(20).slice(2, 6)`, and `Math.random().toString(20).substring(2, 6)`. **Pros and Cons:** * **`substr()`**: This method is simpler to use, but it may not be as efficient as other methods because it returns a reference to the original string, which can lead to unnecessary copying. * **`slice()`**: This method returns a new string object with the specified portion of the original string. It's more efficient than `substr()` because it creates a new string without modifying the original one. * **`substring()`**: This method is similar to `slice()`, but it only works on strings that are modified using this method (i.e., strings created using `substring()`). **Library and Features:** None of the test cases use any external libraries. However, it's worth noting that the benchmark uses `Math.random().toString(20)` to generate a random string for testing. **Special JavaScript Feature or Syntax:** There are no special features or syntax used in this benchmark. It only relies on standard JavaScript methods and functionality. **Other Alternatives:** If you want to optimize your code further, consider using other string manipulation methods like: * `replace()` (for more complex substring replacement) * `indexOf()`, `lastIndexOf()`, and `indexOf()` for finding the position of a substring * `split()` and `join()` for splitting and joining strings Keep in mind that each method has its own trade-offs in terms of performance, readability, and complexity. In summary, this benchmark provides a straightforward comparison between three common string manipulation methods in JavaScript. It's helpful for developers to understand the performance differences between these methods and make informed decisions about which one to use depending on their specific use case.
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