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string split vs string substring 2
(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|test";
Tests:
Array.split
var n1 = s1.split('|'); console.log(n1[0])
Substring
var pip = s1.indexOf('|'); console.log(s1.substring(0, pip));
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
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided benchmark and explain what's being tested. **Benchmark Overview** The benchmark measures the performance of two approaches to split a string into an array: `Array.prototype.split()` (using a regular expression) versus `String.prototype.indexOf()` followed by `String.prototype.substring()`. The test uses a sample string `s1` containing multiple pipe (`|`) characters, which is the expected separator. **Options Compared** The benchmark compares two options: 1. **`Array.prototype.split()`**: This method splits an array into an array of substrings using a specified separator. In this case, the separator is a regular expression that matches one or more pipe (`|`) characters. 2. **`String.prototype.indexOf()` followed by `String.prototype.substring()`**: This approach finds the index of the first occurrence of the separator (in this case, a pipe character) in the string and then extracts the substring before that index. **Pros and Cons** * **`Array.prototype.split()`**: + Pros: Efficient and concise way to split an array into substrings. + Cons: May not work as expected if the input is not an array or if the separator is a special regex character. * **`String.prototype.indexOf()` followed by `String.prototype.substring()`**: + Pros: Can be used with any string type, and the separator can be any character. However, this approach may have performance issues for large strings. + Cons: More complex and less efficient than `Array.prototype.split()`. **Library Usage** None in this benchmark. **Special JS Feature/Syntax** This benchmark does not use any special JavaScript features or syntax that require explanation. **Other Alternatives** If you need to split a string into an array, you can also use: * `String.prototype.split()` with a custom separator (e.g., `s1.split(",")`) * A library like Lodash (`lodash.string` module) which provides `str.split()`, `str.indexOf()`, and `str.substring()` methods. For finding the index of a substring in a larger string, you can use: * `String.prototype.indexOf()` with an optional second argument (the maximum number of occurrences to find) * A library like Lodash (`lodash.string` module) which provides `str.indexOf()` method.
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