Benchmark: endOf vs cascading equality

Script Preparation code:

const prefixes = ["apple", "orange", "mango", "banana", "strawberry", "tomato", "cherry", "grape", "onion", "watermellon"];
const suffixes = ["bad", "good"];

const rand = (n) => Math.floor(Math.random() * n);
const randomStringCount = 1000000;
const randomBufferOfStrings = new Array(randomStringCount);
for (let i = 0; i < randomStringCount; i++) {
  randomBufferOfStrings[i] = prefixes[rand(prefixes.length)] + suffixes[rand(suffixes.length)];
}
window.randomBufferOfStrings = randomBufferOfStrings;

Tests:

chained equality check
let badCount = 0; for (let str of randomBufferOfStrings) { if (str === "applebad" || str === "orangebad" || str === "mangobad" || str === "bananabad" || str === "strawberrybad" || str === "tomatobad" || str === "cherrybad" || str === "grapebad" || str === "onionbad" || str === "watermellonbad") { badCount++; } } console.log(badCount);
endsWith class matching
let badCount = 0; for (let str of randomBufferOfStrings) { if (str.endsWith("bad")) { badCount++; } } console.log(badCount);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
chained equality check
endsWith class matching

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmark test case on the MeasureThat.net website. The benchmark compares two approaches to match strings: using `endsWith` (class matching) versus listing all possible suffixes in an if statement.

**Approaches Compared**

1. **Chained Equality Check**: This approach uses a long series of if-conditional statements to check if each string ends with a specific suffix.
2. **endsWith Class Matching**: This approach uses the built-in `endsWith` method, which is optimized by the JavaScript engine for performance.

**Pros and Cons**

* **Chained Equality Check**:
	+ Pros: Easy to implement and understand.
	+ Cons: Performance-intensive due to the number of conditional checks required.
* **endsWith Class Matching**:
	+ Pros: Optimized by the JavaScript engine, resulting in better performance.
	+ Cons: May be less intuitive for developers unfamiliar with this method.

**Library/Functionality Used**

None. This benchmark uses built-in JavaScript functionality and does not require any external libraries.

**Special JS Feature/Syntax**

The `endsWith` method is a special feature introduced in ECMAScript 2015 (ES6) as part of the standardization effort to improve performance and readability.

**Other Considerations**

* The benchmark creates a large array of random strings, which helps to ensure that the results are representative of real-world scenarios.
* The use of `Math.floor(Math.random() * n)` generates pseudo-random numbers for simulation purposes.
* The benchmark's focus on comparing two specific approaches allows users to evaluate their performance and make informed decisions about which method to use in their own code.

**Alternatives**

Other alternatives to compare string matching methods might include:

1. Using regular expressions (regex) instead of `endsWith`.
2. Implementing a custom string matching function using bitwise operations.
3. Comparing the performance of different suffix arrays or trie data structures for efficient string matching.

These alternatives may be more suitable depending on specific requirements and use cases, but they are not directly relevant to this particular benchmark.

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.122 Safari/537.36

Browser/OS: Chrome 80 on Windows

View result in a separate tab

Test name	Executions per second
chained equality check	11.3 Ops/sec
endsWith class matching	25.1 Ops/sec

Related benchmarks:

endOf vs cascading equality (version: 0)

Test whether it is prohibitive to use endsWith to match a class of strings vs listing all of those items in an if

Comparing performance of: chained equality check vs endsWith class matching

Created: 4 years ago by: Guest

Jump to the latest result

chained equality check

endsWith class matching

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):