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startswith vs slice 2123213
(version: 0)
yeah
Comparing performance of:
startswith vs slice
Created:
2 years ago
by:
Guest
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Script Preparation code:
const str = `hey can i be in `; const shortx = `hey can i` const noop = Function.prototype;
Tests:
startswith
`hey can i be in `.startsWith(`hey can`)
slice
`hey can i be in `.slice(7) === `hey can`
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
startswith
slice
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 break down the provided benchmark definition and explain what's being tested. **Overview** The MeasureThat.net benchmark is comparing two approaches to check if a string starts with a specific substring: `startsWith` and slicing using the `slice()` method. **Options being compared** 1. **`startsWith`**: This method returns a boolean value indicating whether the string starts with the specified substring. 2. **Slicing using `slice()`**: This method returns a new string that is a slice of the original string, starting from index 7 (since we're comparing "hey can i" with "hey can") and returning the next character. **Pros and Cons** 1. **`startsWith`**: * Pros: Easy to read and understand, no need for indexing or slicing. * Cons: May be slower due to function call overhead and potential string concatenation issues (if used with other methods). 2. **Slicing using `slice()`**: * Pros: Can be faster since it avoids the overhead of a function call and potentially reduces memory allocation. * Cons: Requires indexing, which can lead to more complex code and potential errors. **Library** There is no explicit library mentioned in the benchmark definition. However, `Function.prototype` is used in the script preparation code, which suggests that the benchmark might be testing modern JavaScript features or browser-specific behavior. **Special JS feature/syntax** The benchmark definition uses template literals (`\r\n`) and a custom function (`Function.prototype`) to prepare the input strings. These are likely related to modern JavaScript features, but their exact purpose is not crucial for understanding the comparison between `startsWith` and slicing using `slice()`. **Other alternatives** If you were to implement this benchmark, other approaches might include: * Using regular expressions (e.g., `regex.test()`) * Implementing a custom string matching algorithm * Using a library like Lodash or Ramda for utility functions Keep in mind that the goal of this benchmark is to compare two specific approaches, and exploring alternative methods would likely alter the focus of the comparison. In summary, MeasureThat.net's "startswith vs slice" benchmark compares two common ways to check if a string starts with a substring: `startsWith` (a built-in method) and slicing using `slice()` (an array-like approach). While both approaches have their pros and cons, the choice between them depends on performance, readability, and personal preference.
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