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Regex check
(version: 0)
Comparing performance of:
Regex.test vs String.includes vs String.match vs ===
Created:
3 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var string = "Hello world!"; var regex = /Hello/;
Tests:
Regex.test
regex.test(string);
String.includes
string.includes("Hello");
String.match
string.match("Hello");
===
string === "Hello"
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
Regex.test
String.includes
String.match
===
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the benchmark and explain what's being tested, compared, and the pros and cons of each approach. **Benchmark Overview** The provided JSON represents a JavaScript microbenchmark that tests four different approaches to check if a string contains or matches a specific substring: 1. `==` (equality operator) 2. `String.includes()` 3. `String.match()` 4. `Regex.test()` (using regular expressions) **Test Cases** Each test case consists of a single benchmark definition, which is a JavaScript expression that checks if the provided string contains or matches the specified substring. 1. `regex.test(string);`: Tests the `Regex.test()` function. 2. `string.includes("Hello");`: Tests the `String.includes()` method. 3. `string.match("Hello");`: Tests the `String.match()` method. 4. `string === "Hello"`; Tests the `==` operator. **Library Used** In this benchmark, no specific JavaScript library is used apart from built-in methods like `String.includes()`, `String.match()`, and the `Regex.test()` function itself. **Special JS Features or Syntax** There are a few special features and syntaxes present in these test cases: * The `===` operator (equality with strict equality) is being tested. This operator checks for both value and type equality. * Regular expressions (`regex`) are used in the `Regex.test()` function to match specific patterns. **Comparison of Approaches** Here's a brief comparison of each approach, including their pros and cons: 1. **== (equality operator)**: * Pros: Simple, straightforward, and widely supported across browsers. * Cons: Can be slower than other methods due to its overhead, and may not account for type coercion issues. 2. **String.includes()**: * Pros: Fast, efficient, and widely supported. It returns a boolean value indicating whether the substring is found at least once in the string. * Cons: May have performance issues if used with long strings or multiple substrings to search. 3. **String.match()**: * Pros: Returns an array of matches, making it suitable for more complex pattern matching scenarios. It can also be faster than `includes()` for certain use cases. * Cons: Can return an empty array if no match is found, and may not be as efficient as `includes()` for simple substring searches. 4. **Regex.test()**: * Pros: Highly flexible and powerful for complex pattern matching. It returns a boolean value indicating whether the string matches the regular expression. * Cons: Can be slower than other methods due to its complexity, and may require additional setup and configuration. **Alternative Approaches** Other alternative approaches could include: * Using `String.prototype.indexOf()` instead of `includes()` * Using a custom function with a loop to check for substring presence * Using a library like Lodash or Ramda for functional programming approaches However, these alternatives might not be as efficient or widely supported as the methods tested in this benchmark.
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