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Array split vs string substring2
(version: 0)
Comparing performance of:
Array.split vs Substring
Created:
5 years ago
by:
Guest
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Script Preparation code:
var s1 = "foo.bar"; var s2 = "foo";
Tests:
Array.split
var n1 = s1.split(".", 1)[0]; var n2 = s2.split(".", 1)[0];
Substring
var n1 = s1.substring(0, s1.indexOf(".")); var n2 = s2.substring(0, s2.indexOf("."));
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Array.split
Substring
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 what's being tested in the provided benchmark. The benchmark is comparing two approaches to split strings: 1. **String Substring** (`s2.substring(0, s2.indexOf("."))`): This method uses the `indexOf()` function to find the index of the first occurrence of `"."` (a period), and then uses that index as the start point for slicing the string. 2. **Array Split** (`s1.split(".", 1)[0]`): This method uses the `split()` function with a regular expression to split the string into an array, where the separator is `"."`. The `(1)` argument specifies that we want to split only once, and we're interested in the first element of the resulting array. **Pros and Cons:** * **String Substring**: + Pros: Simple, efficient, and widely supported. + Cons: Can be slower for large strings or when dealing with multiple separators, as `indexOf()` has to scan the entire string. * **Array Split**: + Pros: More flexible, can handle multiple separators, and is generally faster than using `indexOf()`. + Cons: May be slower due to the overhead of creating an array, and might not be supported in older browsers or environments. The benchmark seems to favor the **String Substring** approach, as it's listed first in the results. However, this may depend on specific use cases or requirements. **Library/Library-like functionality:** There is no explicit library being used here, but `split()` and `substring()` are both part of the JavaScript Standard Library, making them accessible to all modern browsers without additional dependencies. **Special JS features/syntax:** None mentioned in this benchmark. The code is straightforward JavaScript syntax, without any advanced or experimental features like async/await, arrow functions, or template literals. **Other alternatives:** For similar string manipulation tasks, you might consider: * Using a regular expression with `match()` instead of `split()`, which can provide more flexibility. * Employing a library like Lodash's `string` module for more advanced string manipulation and utility functions. * Utilizing the `replace()` function to remove the separator from the string, rather than splitting or taking a substring. Keep in mind that each approach has its trade-offs, and the choice of method depends on the specific requirements and constraints of your project.
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