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slice vs substring from end
(version: 0)
Comparing performance of:
substring vs slice
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var example = 'MY STRING OF VARYING LENGTH THAT HAS IMPORTANT CHARACTERS AT THE END WHICH I WANT.';
Tests:
substring
var result = example.substring(0, example.length - 4);
slice
var result = example.slice(-4);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
substring
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 JSON data and explain what's being tested, compared, and the pros/cons of each approach. **Benchmark Definition** The benchmark defines two test cases: `slice` and `substring`. Both tests aim to measure which method is faster for extracting a substring from the end of a string in JavaScript. The strings used are identical, with a varying length that has important characters at the end (`"MY STRING OF VARYING LENGTH THAT HAS IMPORTANT CHARACTERS AT THE END WHICH I WANT."`). **Script Preparation Code** The script preparation code sets up a variable `example`, which contains the input string. **Test Cases** There are two test cases: 1. **substring**: This test case uses the `substring()` method to extract the substring from the end of the input string. 2. **slice**: This test case uses the `slice()` method, specifically slicing from the end of the string with a negative offset (`-4`). **Library and Purpose** In both test cases, no specific library is used beyond the built-in JavaScript methods `substring()` and `slice()`. These methods are part of the JavaScript language itself. **JavaScript Features and Syntax** There are no special JavaScript features or syntaxes being tested in these benchmarks. Both `substring()` and `slice()` are standard methods that have been available since early versions of JavaScript. **Comparison and Pros/Cons** The comparison between `slice` and `substring` involves the following: * **Performance**: The benchmark measures the execution speed of both methods, comparing how many times each method is executed per second. * **Efficiency**: Both methods create a new string by extracting a portion from the original string. However, `slice()` uses a more efficient algorithm that doesn't involve creating intermediate objects or strings. Pros and cons of each approach: * **substring()**: + Pros: Easy to understand and use, no need to specify offset. + Cons: May be slower due to the overhead of string manipulation functions. * **slice()**: + Pros: More efficient in terms of performance, doesn't create intermediate objects or strings. + Cons: Requires specifying an offset, which can be confusing for beginners. **Other Alternatives** If you need to extract a substring from the end of a string in JavaScript, other alternatives include: * Using `String.prototype.slice()` with a negative offset (e.g., `example.slice(-4)`). * Utilizing regular expressions (not explicitly tested in this benchmark). Keep in mind that these alternatives may not offer significant performance benefits over `slice()`, which is designed for efficient substring extraction.
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