Benchmark: for vs map - MeasureThat.net

Script Preparation code:

var array = [1, 4, 9, 16];

Tests:

map
array.map(x => x * 2);
for
for(let i = 0; i < array.length; i++) { array[i] = array[i] * 2; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
map
for

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:138.0) Gecko/20100101 Firefox/138.0

Browser/OS: Firefox 138 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
map	85391848.0 Ops/sec
for	260352080.0 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 provided benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark definition is a JSON object that represents a single test case. It contains two main fields:

1. **Name**: A unique identifier for the benchmark, which in this case is "for vs map".
2. **Description**: An optional field that provides a brief description of the benchmark, but it's empty in this case.
3. **Script Preparation Code**: A JavaScript code snippet that sets up the test environment before running the actual benchmark. In this case, it creates an array `array` with some sample values.
4. **Html Preparation Code**: An optional field that provides HTML code to prepare the testing environment, but it's empty in this case.

**Individual Test Cases**

The benchmark defines two individual test cases:

1. **"map"`**: The first test case compares the performance of using the `Array.prototype.map()` method to iterate over an array and perform some operation on each element.
2. **"for"`**: The second test case compares the performance of using a traditional `for` loop to iterate over an array and perform some operation on each element.

**Options Compared**

The two options being compared are:

1. **`Array.prototype.map()`**: A modern JavaScript method that creates a new array with the results of applying a provided function on every element in this array.
2. **Traditional `for` loop**: An older approach to iterating over an array using a manual index variable.

**Pros and Cons**

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

1. **`Array.prototype.map()`**:
	* Pros:
		+ More concise and expressive code.
		+ Less error-prone, as it's designed for this specific use case.
	* Cons:
		+ May incur additional overhead due to the creation of a new array.
		+ Not suitable for large datasets or performance-critical applications.
2. **Traditional `for` loop**:
	* Pros:
		+ More control over the iteration process, allowing for manual optimization.
		+ Suitable for large datasets and performance-critical applications.
	* Cons:
		+ Longer and more error-prone code.
		+ May lead to performance issues if not implemented correctly.

**Library**

In this benchmark, no libraries are explicitly mentioned. However, the `Array.prototype.map()` method is a built-in JavaScript API that's widely supported across modern browsers.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntaxes used in these benchmarks.

**Other Alternatives**

For comparing iteration methods, other alternatives could include:

1. **`forEach()`**: A more concise alternative to `for` loops, but it still incurs additional overhead.
2. **`reduce()`**: Another array method that can be used for iteration, although it's not as straightforward as `map()` or traditional `for` loops.

The choice of iteration method ultimately depends on the specific use case and performance requirements.

Related benchmarks:

for vs map (version: 0)

Comparing performance of: map vs for

Created: 6 years ago by: Guest

Jump to the latest result

map

for

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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