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Array split, slice & join vs string substrings
(version: 0)
This benchmarks test a scenario of splitting the first part of a dot "." separated string like domain names. For example: aaa.mysite.domain.com
Comparing performance of:
Array.split & shift & join vs Substring
Created:
3 years ago
by:
Guest
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Script Preparation code:
var s1 = "first.second.third.fourth";
Tests:
Array.split & shift & join
var split = s1.split("."); var first = split.shift(); var others = split.join(".");
Substring
var indexOf = s1.indexOf("."); var first = s1.substring(0, indexOf); var others = s1.substring(indexOf+1, s1.length - 1);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Array.split & shift & join
Substring
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Slowest:
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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, compared options, pros and cons, and other considerations. **Benchmark Description** The benchmark tests two approaches to split a string into parts: using `Array.split` with `shift` method, and using `String.substring`. The input string is a domain name in the format "aaa.mysite.domain.com". **Options being compared** 1. **Array.split & shift & join**: This approach splits the string at each dot (`.`) and stores the resulting parts in an array. It then uses the `shift` method to remove the first element (the domain name) from the array, and finally uses the `join` method to concatenate the remaining parts with dots in between. 2. **Substring**: This approach uses the `String.indexOf` method to find the position of the first dot (`.`) in the string, and then uses the `String.substring` method to extract two substrings: one from the beginning of the string up to the dot, and another from the dot + 1 to the end of the string. **Pros and Cons** **Array.split & shift & join** Pros: * Easy to read and understand * Simple implementation Cons: * Requires an array to store intermediate results * Using `shift` method can be slower than other approaches for large strings **Substring** Pros: * Does not require extra memory (array) for intermediate results * Can be faster for large strings since it only requires two substrings Cons: * More complex implementation * Uses more methods (`indexOf`, `substring`) which can lead to overhead **Other considerations** * The benchmark uses a Windows desktop platform, which may affect the performance of certain approaches. * The input string is relatively short (only 4 parts), which might not be representative of larger strings. * The benchmark does not account for edge cases such as empty strings or strings with no dots. **Library and special JS features used** The benchmark uses the following library: * `String.prototype.indexOf`: a built-in method in JavaScript that finds the position of a substring in another string. * `String.prototype.substring`: a built-in method in JavaScript that extracts a part from another string. There are no special JavaScript features or syntaxes used in this benchmark.
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