Benchmark: Array.forEach vs for loop

Script Preparation code:

var items = [1,2,3,4,5,6,7,8,9,10];
var total = 0;

Tests:

Array.forEach
items.forEach(item => total = total + item);
for loop
for(var i = 0 ; i < items.length ; i++) { total = total + items[i]; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.forEach
for loop

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Measuring JavaScript performance is crucial for understanding how different approaches impact the execution speed of our code.

**Benchmark Definition and Options**

The provided JSON defines a benchmark between `Array.forEach` and a traditional `for` loop for adding up the elements in an array. The two options being compared are:

1. **`Array.forEach`**: This method is used to execute a function on each element of an array, without requiring the caller to specify the index.
2. **Traditional `for` loop**: A classic loop construct that iterates over the array using a counter variable.

**Pros and Cons**

**`Array.forEach`:**

Pros:

* More concise and readable code
* Automatic iteration over the array elements
* No need to keep track of the index

Cons:

* May incur overhead due to function invocation and execution
* Performance can be slower compared to traditional loops, especially for large arrays

**Traditional `for` loop:**

Pros:

* Direct access to each element without additional overhead
* Control over iteration and indexing
* Flexibility in customizing the loop behavior

Cons:

* More verbose code
* Requires manual management of the index variable

In terms of performance, traditional loops are often faster because they avoid the function invocation and execution overhead. However, `Array.forEach` is designed to provide a more convenient and readable way to iterate over arrays.

**Library: None**

There is no library being used in this benchmark. The code snippets are basic examples of array iteration using two different approaches.

**Special JavaScript Features or Syntax**

* No special features or syntax are being tested here, but `Array.forEach` does utilize a modern JavaScript feature that was introduced in ECMAScript 5.
* Note that the use of `var`, `=>`, and `\r\n` is specific to this benchmark and might not be suitable for production code.

**Alternative Approaches**

Other alternatives to compare would include:

1. **`Array.prototype.reduce()`**: A method that reduces an array to a single value by applying a function to each element.
2. **`Array.prototype.map()`**: A method that creates a new array with the results of applying a function to each element.
3. **`Closure-based loops`**: Using closures to create custom iteration loops can provide performance benefits for large datasets.

Measuring these alternatives would help identify which approach is most efficient and suitable for specific use cases.

In conclusion, the `Array.forEach` vs traditional `for` loop benchmark provides a basic example of how to compare different approaches to iterating over an array in JavaScript. Understanding the pros and cons of each method helps developers choose the most efficient solution for their specific needs.

Related benchmarks:

Array.forEach vs for loop (version: 0)

Comparing performance of: Array.forEach vs for loop

Created: 4 years ago by: Registered User

Jump to the latest result

Array.forEach

for loop

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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