Benchmark: find() vs for...of vs for-loop 2222

HTML Preparation code:

<div id='test'></div>

Script Preparation code:

function findIt(arr){
  for(let i=0; i<arr.length; i++){
  var value = arr[i];
  if (value === 'b') {
		return value;
   }
}
}

Tests:

for-loop
var arr = ['hello', 'a', 'b']; let val = findIt(arr);
for..of
var arr = ['hello', 'a', 'b']; let val; for (var value of arr) { if (value === 'b') { val = value; break; } }
Array.find()
var arr = ['hello', 'a', 'b']; let val = arr.find(node => node.id === 'b');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for-loop
for..of
Array.find()

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:133.0) Gecko/20100101 Firefox/133.0

Browser/OS: Firefox 133 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
for-loop	68277376.0 Ops/sec
for..of	23048288.0 Ops/sec
Array.find()	77812088.0 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated one year ago):

LLMs can make mistakes. Check important info.

The benchmark defined in the provided JSON compares the performance of three different approaches to find a specific value in an array: using a traditional `for` loop, a `for...of` loop, and the `Array.find()` method. The goal is to evaluate how these methods perform in terms of executions per second.

### Approaches Compared:

1. **for-loop**: 
   - **Benchmark Definition**: 
     ```javascript
     var arr = ['hello', 'a', 'b'];
     let val = findIt(arr);
     ```
   - **Description**: This approach manually iterates through the array using an index and returns the value if it matches 'b'.

**Pros**:
   - Offers complete control over the iteration process.
   - Can be optimized for specific operations or conditions.

**Cons**:
   - More verbose and may lead to more boilerplate code.
   - Increased likelihood of errors, such as off-by-one mistakes.
  
2. **for...of**:
   - **Benchmark Definition**: 
     ```javascript
     var arr = ['hello', 'a', 'b'];
     let val;
     for (var value of arr) {
       if (value === 'b') {
         val = value;
         break;
       }
     }
     ```
   - **Description**: This loops through the elements of the array directly, breaking out early if a match is found.

**Pros**:
   - Cleaner and more concise than a traditional for-loop.
   - Easier to read and understand at a glance.

**Cons**:
   - Generally, it may have a slight overhead compared to a traditional for-loop due to the creation of the iterator.

3. **Array.find()**:
   - **Benchmark Definition**: 
     ```javascript
     var arr = ['hello', 'a', 'b'];
     let val = arr.find(node => node === 'b');
     ```
   - **Description**: This method abstracts the loop entirely, providing a functional approach where a function is passed to specify the condition.

**Pros**:
   - Highly readable and expressive; communicates intent clearly.
   - Less chance for iteration-related errors.

**Cons**:
   - May incur performance overhead as a function is called for each element.
   - Not as flexible for more complex operations compared to manual iterations through loops.

### Benchmark Results:
Based on the benchmark results, here’s how each method performed in terms of executions per second:

- **Array.find()**: 103,034,248.0 executions per second (fastest)
- **for-loop**: 102,914,608.0 executions per second (very close second)
- **for...of**: 96,021,560.0 executions per second (slowest)

### Other Considerations:
- **Performance Variability**: It's crucial to note that performance can vary based on the input size and the environment in which the code is executed. The results shown are specific to the benchmark conditions set in this test.
- **Browser Optimization**: JavaScript engines (like V8 in Chrome) might optimize certain patterns, which can affect performance results. Hence, benchmarks should be interpreted with caution and may not reflect real-world usage consistently.
- **Alternatives**: Other than these three approaches, alternatives like using `forEach()`, `map()`, or even third-party libraries like Lodash could be considered for searching through arrays. Each of these methods brings its syntax and performance characteristics.

In conclusion, the choice of method to find values in an array should consider not just performance but also readability, maintainability, and specific use-case requirements. For most day-to-day tasks, while traditional loops may offer slight performance benefits, the `Array.find()` method can greatly enhance code clarity, especially for developers who prioritize clean and manageable code.

Related benchmarks:

find() vs for...of vs for-loop 2222 (version: 1)

Testing the difference between native loops and find()

Comparing performance of: for-loop vs for..of vs Array.find()

Created: one year ago by: Guest

Jump to the latest result

for-loop

for..of

Array.find()

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated one year ago):