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Various string search methods
(version: 0)
Comparing performance of:
Includes for last word vs Includes for middle word vs EndsWtih for last word vs RegEx for last word (with anchor) vs RegEx for middle word
Created:
2 years ago
by:
Guest
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Script Preparation code:
var testStr="Test string of moderate length that ends with the phrase Hello World!";
Tests:
Includes for last word
testStr.includes("World!");
Includes for middle word
testStr.includes("ends");
EndsWtih for last word
testStr.endsWith("World!");
RegEx for last word (with anchor)
/World!$/.test(testStr);
RegEx for middle word
/ends/.test(testStr);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (5)
Previous results
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Test case name
Result
Includes for last word
Includes for middle word
EndsWtih for last word
RegEx for last word (with anchor)
RegEx for middle word
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Overview** The provided benchmark, hosted on MeasureThat.net, aims to compare the performance of different string search methods in JavaScript. The test cases focus on searching for specific substrings within a moderately long string that ends with "Hello World!". **Test Cases** There are four individual test cases: 1. **Includes for last word**: Searches for the substring "World!" from the end of the string using `testStr.includes("World!")`. 2. **Includes for middle word**: Searches for the substring "ends" in the middle of the string using `testStr.includes("ends")`. 3. **EndsWith for last word**: Verifies that the entire string ends with "Hello World!" using `testStr.endsWith("World!")`. 4. **RegEx for last word (with anchor)**: Uses a regular expression to search for the substring "World!" from the end of the string, anchored with `/World!$/.test(testStr)`. 5. **RegEx for middle word**: Searches for the substring "ends" in the middle of the string using `testStr.match(/ends/)`. However, it's worth noting that this test case is not actually comparing the performance of regular expressions. **Comparison Options** The benchmark compares the performance of the following options: * **String.includes()**: A built-in JavaScript method for searching a substring within a string. * **String.endsWith()**: A built-in JavaScript method for verifying that a string ends with another substring. * **Regular Expression (RegEx) search**: Using the `/World!$/.test(testStr)` syntax to search for a substring from the end of the string. **Pros and Cons** Here's a brief summary of the pros and cons of each option: 1. **String.includes()**: * Pros: Simple, efficient, and widely supported. * Cons: May not perform well with very large strings or complex searches. 2. **String.endsWith()**: * Pros: Fast and efficient for simple end-of-string checks. * Cons: Limited to checking only the last few characters of a string. 3. **Regular Expression (RegEx) search**: * Pros: Highly flexible and powerful, but may be slower than other options due to the overhead of parsing regular expressions. * Cons: Steeper learning curve, and may not perform well with very large strings. **Library Usage** The benchmark does not use any external libraries beyond what's already included in JavaScript (e.g., `String` methods). **Special JS Features/Syntax** None are mentioned in the provided test cases. If special features or syntax were being used, they would likely impact the performance and behavior of each test case. **Alternatives** For similar benchmarking purposes, you could also explore other options: * **Benchmarking frameworks**: Tools like Benchmark.js, Fastify Benchmarks, or Webpack's built-in benchmarks can help with creating and running microbenchmarks. * **String search libraries**: Libraries like StringSearch or StrSubstr provide alternative string search methods that might be worth testing in a benchmarking context.
Related benchmarks:
looking up the last character of a string
String.includes vs. multiple String.endsWith
Fastest way to do string includes string
Fastest way to do string includes string (ignoring locale)
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