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String.IndeOf vs. String.includes
(version: 0)
Comparing performance of:
IndexOf vs String.includes
Created:
3 years ago
by:
Guest
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Script Preparation code:
var string = "Hello world!";
Tests:
IndexOf
string.indexOf("Hello") !== -1
String.includes
string.includes("Hello");
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
IndexOf
String.includes
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 its components. **Benchmark Definition** The benchmark is comparing two string methods: `indexOf` and `includes`. The purpose of this benchmark is to determine which method is faster for searching for a substring within a larger string. **Script Preparation Code** The script preparation code is simply creating a variable `string` with the value `"Hello world!"`. This sets up the initial string that will be used in the tests. **Html Preparation Code** There is no HTML preparation code provided, which suggests that this benchmark is focused solely on JavaScript performance and does not involve any additional web page rendering or DOM manipulation. **Test Cases** The test cases are defined within a nested object: ```json [ { "Benchmark Definition": "string.indexOf(\"Hello\") !== -1", "Test Name": "IndexOf" }, { "Benchmark Definition": "string.includes(\"Hello\");", "Test Name": "String.includes" } ] ``` These test cases are identical to the benchmark definition, with the first test case checking if `indexOf` returns a truthy value for searching for `"Hello"` within the initial string, and the second test case checking if `includes` returns a truthy value for doing the same. **Pros and Cons of Different Approaches** There are two main approaches being compared here: 1. **`indexOf`**: This method searches for the specified substring from left to right and returns the index of the first occurrence, or -1 if it's not found. This approach can be slower than `includes` because it involves searching the entire string. 2. **`includes`**: This method simply checks if the specified substring is a part of the original string, returning a boolean value indicating whether it exists. This approach is generally faster than `indexOf` because it only needs to check for existence, rather than finding the exact index. **Pros and Cons** * `indexOf`: + Pros: Can be used to find the index of a specific substring. + Cons: Slower due to searching the entire string. * `includes`: + Pros: Faster because it only checks for existence. + Cons: Returns a boolean value indicating whether the substring exists, rather than its index. **Library and Purpose** There is no library being used in this benchmark. It appears that these methods are built-in to JavaScript. **Special JS Features or Syntax** This benchmark does not use any special JavaScript features or syntax beyond standard ECMAScript functions. **Other Alternatives** If you wanted to explore other string search methods, some alternatives could be: * Using a regular expression with the `RegExp` object * Utilizing a library like `lodash.string` which provides optimized string searching methods However, for simple substring searches within JavaScript, using built-in `indexOf` and `includes` methods remains a suitable choice.
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