Benchmark: Testing methods to iterate array

Tests:

Iterate through array once
const operation = [ { "op": "replace", "path": "/author/reference", "value": "chewy" }, { "op": "replace", "path": "/status", "value": "completed" }, { "op": "replace", "path": "/subject/reference", "value": "foobar" } ]; let statusOperation = null; let foundItemOperations = null; for (var i = 0, len = operation.length; i < len; i++) { operation[i].path === '/status' ? statusOperation = operation[i] : null; operation[i].path.indexOf('item') !== -1 ? foundItemOperations : null; }
Iterate through array twice
const operation = [ { "op": "replace", "path": "/author/reference", "value": "chewy" }, { "op": "replace", "path": "/status", "value": "completed" }, { "op": "replace", "path": "/subject/reference", "value": "foobar" } ]; const statusOperation = operation.find(op => op.path === '/status'); const foundItemOperations = operation.some((op) => { return op.path.indexOf('item') !== -1; });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Iterate through array once
Iterate through array twice

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and some pros and cons of each approach.

**Benchmark Definition**

The benchmark definition is empty, which means that the script preparation code and HTML preparation code are also empty, implying that no additional setup or rendering is needed for this benchmark.

**Individual Test Cases**

There are two test cases:

1. **Iterate through array once**
The benchmark definition for this test case includes a JavaScript operation that iterates over an array using a `for` loop:
```javascript
const operation = [...]; // Array of objects with "op", "path", and "value" properties

let statusOperation = null;
let foundItemOperations = null;

for (var i = 0, len = operation.length; i < len; i++) {
  if (operation[i].path === '/status') {
    statusOperation = operation[i];
  } else if (operation[i].path.indexOf('item') !== -1) {
    foundItemOperations = operation[i];
  }
}
```
This test case is likely testing the performance of iterating over an array using a `for` loop, specifically checking for the existence of certain conditions in each iteration.

2. **Iterate through array twice**
The benchmark definition for this test case includes similar JavaScript operations as the first test case, but with two notable differences:
```javascript
const operation = [...]; // Array of objects with "op", "path", and "value" properties

const statusOperation = operation.find(op => op.path === '/status');

const foundItemOperations = operation.some((op) => {
  return op.path.indexOf('item') !== -1;
});
```
This test case is likely testing the performance of iterating over an array using the `find()` and `some()` methods.

**Libraries**

There is no library explicitly mentioned in the benchmark definitions, but it's possible that some libraries are being used implicitly (e.g., the JavaScript built-in functions like `find()` and `some()`).

**Special JS Features or Syntax**

The benchmark tests the use of two specific JavaScript features:

* The `for...of` loop is not used in either test case, which implies that the loop variable is still using the traditional `var i = 0;` syntax.
* The `find()` and `some()` methods are used to iterate over the array, which might be considered a more modern JavaScript approach.

**Pros and Cons of Each Approach**

Here's a brief pros and cons summary for each approach:

1. **Iterate through array once (for loop)**
	* Pros:
		+ Can be faster for small arrays due to cache locality.
		+ More control over the iteration process.
	* Cons:
		+ May be slower for large arrays due to increased overhead from indexing and conditionals.
		+ Requires more code to manage the loop variable and increment.
2. **Iterate through array once (find())**
	* Pros:
		+ Can be faster for small arrays, especially if using a predicate function.
		+ More concise and expressive code.
	* Cons:
		+ May not work correctly for large arrays or out-of-order elements.
		+ Less control over the iteration process.

3. **Iterate through array twice (find() and some())**
	* Pros:
		+ Can be faster overall due to the use of optimized algorithms.
		+ More concise code.
	* Cons:
		+ May require more memory due to the creation of temporary variables.
		+ Less control over the iteration process.

**Alternatives**

If you're looking for alternative approaches, consider:

* Using `for...of` loops instead of traditional `for` loops.
* Utilizing other JavaScript algorithms like `reduce()` or `forEach()` instead of manual iteration.
* Exploring libraries like Lodash or Ramda for more concise and expressive array operations.

Keep in mind that the best approach depends on your specific use case, performance requirements, and coding style preferences.

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36

Browser/OS: Chrome 78 on Windows 7

View result in a separate tab

Test name	Executions per second
Iterate through array once	20891656.0 Ops/sec
Iterate through array twice	11408708.0 Ops/sec

Related benchmarks:

Testing methods to iterate array (version: 0)

Comparing performance of: Iterate through array once vs Iterate through array twice

Created: 4 years ago by: Guest

Jump to the latest result

Iterate through array once

Iterate through array twice

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):