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Slice vs substr
(version: 0)
Comparing performance of:
mit slice vs mit substr
Created:
6 years ago
by:
Guest
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Script Preparation code:
var text = "?bla=blub&foo=bar";
Tests:
mit slice
var result = text.slice(1);
mit substr
var result = text.substr(1);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
mit slice
mit substr
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 and explain what's being tested. **Benchmark Overview** The benchmark compares two string slicing methods in JavaScript: `slice()` and `substr()`. The script preparation code creates a sample string `text` containing query parameters, which will be sliced to extract parts of it. **Options Compared** The two options being compared are: 1. **`slice()`**: This method returns a new string created by extracting sections of an existing string. It's called "slice" because it "slices off" a portion of the original string. 2. **`substr()`**: This method returns a substring from the beginning of an existing string, and returns `undefined` if the offset is out of range. **Pros and Cons** * **`slice()`**: + Pros: More concise syntax, can be used to extract multiple substrings in one call. + Cons: Can be slower than `substr()`, especially for large strings. * **`substr()`**: + Pros: Generally faster than `slice()`, since it's a more primitive operation that doesn't involve creating a new string object. + Cons: Less concise syntax, can lead to errors if not used carefully. **Library and Special JS Features** There are no specific libraries or special JavaScript features mentioned in the benchmark definition. The only notable thing is the use of URL query parameters (`?bla=blub&foo=bar`) in the `text` string, which is a common pattern in web development. **Other Considerations** When writing benchmarks like this one, it's essential to consider factors that might affect performance, such as: * String length: Longer strings can impact performance. * Browser and platform differences: Different browsers and platforms may have varying levels of optimization or implementation details for string slicing methods. * Cache effects: Caching results between benchmark runs can skew performance measurements. **Other Alternatives** For similar benchmarks, you might want to consider testing other string slicing methods, such as: * **`substring()`**: This method is similar to `substr()`, but it returns a new string object instead of `undefined`. * **ES6's template literals**: You could also test the performance of using template literals to create strings and slice them. Keep in mind that the choice of testing methods depends on the specific use case and requirements of your benchmark.
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