Benchmark: find reversed for loop versus find method 2

Script Preparation code:

var array = [];
for (let i = 0 ; i < 10000 ; i++) {
	array.push ({ value: Math.floor (Math.random () * 1000) });
}

Tests:

reversed for loop
const value = Math.floor (Math.random () * 1000); let found = undefined; for (let i = array.length - 1 ; i >= 0 ; i--) { const cell = array[i]; if (cell.value === value) { found = cell; break; } }
find method =>
const value = Math.floor (Math.random () * 1000); let found = array.find ((cell) => cell.value === value);
find method function
const value = Math.floor (Math.random () * 1000); let found = array.find (function (cell) { return cell.value === value });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
reversed for loop
find method =>
find method function

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Windows

View result in a separate tab

Test name	Executions per second
reversed for loop	469430.2 Ops/sec
find method =>	860505.5 Ops/sec
find method function	855161.8 Ops/sec

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

LLMs can make mistakes. Check important info.

The benchmark titled "find reversed for loop versus find method 2" compares three different approaches to find an object in an array of objects, where each object has a property `value`. The key operations tested are:

1. **Reversed For Loop**:
   - **Implementation**: The first approach is a traditional reversed for loop. This method starts from the end of the array and iterates backwards until it finds an object with the same `value`.
   - **Pros**: 
     - A for loop provides fine-grained control over iteration and can be more performant in certain situations, especially with large datasets.
     - It can be easier to optimize since it does not create additional closures or objects.
   - **Cons**:
     - Code can become less readable, as the loop's control structure adds complexity.
     - Requires manual handling of the found state (using a break statement).

2. **Array `find` Method (Arrow Function)**:
   - **Implementation**: The second approach uses the `find` method with an arrow function. This method searches the array and returns the first element that satisfies the provided testing function (where `cell.value` matches `value`).
   - **Pros**: 
     - More expressive and succinct than a traditional loop, improving code readability.
     - Easily handles scope issues with the `this` keyword when using an arrow function.
   - **Cons**:
     - This method may incur additional overhead due to the creation of a function object for each iteration, potentially impacting performance compared to manual iteration.

3. **Array `find` Method (Regular Function)**:
   - **Implementation**: The third approach uses the same `find` method but with a traditional function expression instead of an arrow function.
   - **Pros and Cons**: 
     - Similar pros to the arrow function solution in terms of readability.
     - This approach can handle the `this` context differently depending on how the function is called, which might or might not be an issue depending on the context.
     - Performance differences between the arrow function and regular function implementations are minimal, as shown by the benchmark results.

### Benchmark Results Overview:
According to the benchmark results:
- The `find method =>` (with arrow function) demonstrated the highest performance at approximately **860,505 executions per second**.
- The `find method function` (regular function) performs nearly as well, at approximately **855,161 executions per second**.
- The `reversed for loop` came in at the lowest with approximately **469,430 executions per second**.

### Other Considerations:
The choice between these methods often depends on the context of code usage:
- **When to Use Conventional Loops**: If performance is critical and you are working with very large datasets where micro-optimizations matter, using a for loop might still be viable.
- **Readability vs. Performance**: For most day-to-day tasks and especially in team environments, prioritizing readability (such as using `find` with an appropriate function) is often more important than micro-optimizations.
- **Alternative Approaches**: Other alternatives not tested here could include:
   - Utilizing sorting or indexing if the array is known to be sorted, which can optimize search time.
   - Implementing other data structures such as Maps for faster look-up times if the array is used frequently for queries.

In summary, the benchmark highlights the balance between code readability and performance in JavaScript when searching arrays, showcasing the trade-offs for developers to consider when writing and optimizing code.

Related benchmarks:

find reversed for loop versus find method 2 (version: 1)

Comparing performance of: reversed for loop vs find method => vs find method function

Created: one year ago by: Guest

Jump to the latest result

reversed for loop

find method =>

find method function

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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