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trim test_ceeres
(version: 0)
Comparing performance of:
Trim vs indexOf
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var str = " 42"
Tests:
Trim
str.trimStart()
indexOf
str.lastIndexOf(" ")
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Trim
indexOf
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 benchmarking data and explain what's being tested. **Benchmark Definition** The provided JSON represents a JavaScript microbenchmark, where users can create and run tests to measure the performance of specific code snippets. The "Name" field specifies that this is a test case for trimming whitespace from a string using the `trimStart()` method. **Script Preparation Code** The "Script Preparation Code" section provides an initial value for the variable `str`, which will be used as input for the benchmarking tests. In this case, it's set to `" 42"`, containing multiple whitespace characters at the beginning of the string. **Html Preparation Code** There is no HTML preparation code provided, which means that the benchmarking tests are isolated and do not depend on any external HTML context. **Individual Test Cases** The test cases are defined in a separate section of the JSON data. There are two test cases: 1. **Trim**: This test case measures the performance of the `str.trimStart()` method. 2. **indexOf**: This test case measures the performance of the `str.lastIndexOf(" ")` method. **Library and Purpose** In this benchmark, the `trimStart()` method is used to trim whitespace from the beginning of a string. The `lastIndexOf()` method is used to find the index of the last occurrence of a substring (`" "`) in the input string. The `trimStart()` method is a part of the JavaScript String prototype and is used to remove whitespace characters from the beginning of a string. **Special JS Features or Syntax** There are no special JS features or syntax mentioned in this benchmark. The tests only utilize standard JavaScript methods and variables. **Other Alternatives** Other alternatives for trimming whitespace from a string could be: * `str.replace(/^ +/g, '')`: This method uses regular expressions to replace one or more whitespace characters at the beginning of the string with an empty string. * `str.substring(str.indexOf(' '))`: This method finds the index of the first whitespace character in the string and then returns a new substring starting from that index. However, it's worth noting that these alternatives may have different performance characteristics compared to the `trimStart()` method used in this benchmark. **Pros and Cons** Here are some pros and cons of using each approach: * **`trimStart()`**: Pros: Simple and efficient. Cons: May not work as expected for non-ASCII characters. * `str.replace(/^ +/g, '')`: Pros: Works with any whitespace character. Cons: May be slower than `trimStart()` due to regular expression overhead. * `str.substring(str.indexOf(' '))`: Pros: Works with any whitespace character. Cons: May be slower than `trimStart()` and more prone to errors. Ultimately, the choice of approach depends on the specific requirements of your project and the trade-offs you're willing to make between performance, simplicity, and robustness.
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