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Check Substring vs Slice to extract substrings
(version: 0)
Comparing performance of:
Substring vs Slice
Created:
3 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
const sentence = 'Mastering JS is a very helpful website';
Tests:
Substring
const sentence = 'Mastering JS is a very helpful website'; sentence.substring(12, 0);
Slice
const sentence = 'Mastering JS is a very helpful website'; sentence.slice(0, 12);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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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 benchmark and explain what's being tested. **Benchmark Overview** The benchmark compares two approaches to extract substrings from a given sentence: `substring` and `slice`. The goal is to measure which approach is faster in terms of execution time per second, measured across multiple executions. **Options Compared** Two options are compared: 1. **Substring**: Uses the `substring` method, which takes three arguments: the start index, the end index, and returns a new string containing the substring from the start index to the end index. 2. **Slice**: Uses the `slice` method, which also takes two arguments: the start index and the end index, but returns a new array containing the specified number of elements starting from the start index. **Pros and Cons** * **Substring**: + Pros: More intuitive for humans, as it uses a human-readable syntax. + Cons: Might be slower due to the overhead of creating a new string object. * **Slice**: + Pros: Faster in many cases, since it creates an array instead of a string object. + Cons: Less intuitive for humans, requiring more memory and potentially slower performance. **Library and Syntax** Neither `substring` nor `slice` uses any external libraries. They are built-in methods in JavaScript. **Special JS Feature or Syntax** There is no special JavaScript feature or syntax used in this benchmark. The focus is on the execution time of these two methods. **Other Considerations** * **Memory Allocation**: Both methods allocate memory for the new string or array object, but `slice` might allocate more due to the overhead of creating an array. * **Cache Performance**: The cache performance of `slice` might be better, since it creates a smaller array with fewer elements, which can lead to faster access times. **Alternatives** Other alternatives that could have been used in this benchmark include: * Using regular expressions (regex) to extract substrings * Using a library like Lodash or Underscore.js for string manipulation * Using a different approach, such as using `indexOf` and `substr` methods Keep in mind that these alternatives would change the focus of the benchmark and might not provide comparable results. In summary, this benchmark compares two common approaches to extract substrings from a sentence: `substring` and `slice`. While `substring` is more intuitive for humans, `slice` might be faster due to its ability to create an array. The choice between these methods ultimately depends on the specific use case and performance requirements.
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