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Substring
(version: 1)
Comparing performance of:
slice vs substring vs substr
Created:
9 years ago
by:
Registered User
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Script Preparation code:
var string = "I am the god of hellfire, and I bring you..."
Tests:
slice
var substring = string.slice(17, 25);
substring
var substring = string.substring(16, 24);
substr
var substring = string.substr(16, 8);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
slice
substring
substr
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 definition and test cases. **Benchmark Definition** The provided JSON represents a JavaScript microbenchmark named "Substring". It's a simple benchmark that tests the performance of three string slicing methods: `slice`, `substring`, and `substr`. The script preparation code provides a fixed string `string` with which the slicing operations will be performed. **Script Preparation Code** ```javascript var string = "I am the god of hellfire, and I bring you..."; ``` This is a simple string constant that will be used as input for the slicing operations. **Html Preparation Code** Since there's no HTML preparation code provided, we can assume that this benchmark doesn't involve any complex HTML-related tasks. **Test Cases** The individual test cases are defined in an array of objects. Each object contains two properties: * `Benchmark Definition`: a string representing the JavaScript code snippet that performs the slicing operation. * `Test Name`: a short description of the slicing method being tested (e.g., "slice", "substring", or "substr"). Here's a brief explanation of each test case: 1. **"slice"**: This test case uses the `slice()` method to extract a substring from the input string, starting at index 17 and ending at index 25. 2. **"substring"**: This test case uses the `substring()` method to extract a substring from the input string, starting at index 16 and ending at index 24. 3. **"substr"**: This test case uses the `substr()` method to extract a substring from the input string, starting at index 16 and ending at length 8. **Pros and Cons of Each Approach** Here's a brief analysis of each slicing method: * **`slice()`**: The `slice()` method is generally faster than the other two methods because it's optimized for performance. However, it may not work correctly with negative indices or when the start index is greater than the end index. * **`substring()`**: The `substring()` method is similar to `slice()`, but it has some additional features like support for negative indices and start/end index swapping. However, it's generally slower than `slice()`. * **`substr()`**: The `substr()` method is an older method that's been deprecated in favor of `slice()` and `substring()`. It works differently from the other two methods and may not be as efficient. **Library** None of the test cases explicitly use a library. However, it's worth noting that modern JavaScript browsers often provide built-in functions like `String.prototype.slice()`, `String.prototype.substring()`, and `String.prototype.substr()` that can significantly improve performance. **Special JS Features or Syntax** This benchmark doesn't involve any special JavaScript features or syntax beyond the standard string slicing methods.
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