Benchmark: for vs foreach vs some

Script Preparation code:

var array = new Array(100);

Tests:

for
for (var i = 0; i < array.length; i++) { array[i]; }
foreach
array.forEach(function(item, index) { return item; });
some
array.some(function(item, index) { return item === array[index]; });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
foreach
some

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser/OS: Chrome 121 on Windows

View result in a separate tab

Test name	Executions per second
for	209556.6 Ops/sec
foreach	11304574.0 Ops/sec
some	11436338.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark is designed to compare the performance of three loop constructs: `for`, `forEach`, and `some`. The test case uses an array of length 100 as input data.

**Loop Constructs**

1. **`for` loop**: This is a traditional loop construct that uses a variable (`i`) to iterate over the array indices.
2. **`forEach` loop**: This is a modern loop construct introduced in ECMAScript 2015 (ES6). It allows iterating over an array using a callback function, which receives two arguments: `item` and `index`.
3. **`some` loop**: This is another modern loop construct also introduced in ES6. It returns `true` as soon as the condition inside the callback function is met.

**Pros and Cons**

*   **`for` loop**:
    *   Pros:
        *   Widely supported across different browsers.
        *   Easy to understand for developers familiar with traditional loops.
    *   Cons:
        *   Can be less efficient than modern loop constructs like `forEach`.
*   **`forEach` loop**:
    *   Pros:
        *   Modern, widely adopted, and well-supported in most browsers.
        *   Allows for a more concise and expressive way of iterating over arrays.
    *   Cons:
        *   May have performance overhead due to the use of callback functions.
*   **`some` loop**:
    *   Pros:
        *   More concise and expressive than traditional loops or `forEach`.
        *   Can be beneficial for certain algorithms that rely on early termination conditions.
    *   Cons:
        *   Less widely supported across older browsers.

**Library/Functionality Used**

In this benchmark, the `forEach` loop function is used from the ECMAScript standard library (ES6). The `some` loop function is also an ECMAScript standard library function. These functions are built-in to JavaScript and do not require any additional libraries or dependencies.

**Special JS Features/Syntax**

There are no special JavaScript features or syntaxes being tested in this benchmark, apart from the fact that it uses modern ES6 features like `forEach` and `some`. However, it's worth noting that some older browsers might not support these features.

Related benchmarks:

for vs foreach vs some (version: 0)

Compare loop performance

Comparing performance of: for vs foreach vs some

Created: 9 years ago by: Guest

Jump to the latest result

for

foreach

some

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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