Benchmark: For loop map vs map builtin for 10000000 elements

Script Preparation code:

var size = 10000000;

Tests:

for
const arr = Array(size).fill(1); const res = []; for (let i = 0; i < size; i++) { res.push(arr[i] + 1); }
Map
const arr = Array(size).fill(1); arr.map(x => x + 1)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
Map

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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Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Overview**

The provided benchmark measures the performance difference between two approaches for mapping over an array in JavaScript:

1. **For Loop Mapping**: Using a traditional `for` loop to iterate over the array and push elements to a new array.
2. **Built-in Map Function**: Utilizing the built-in `map()` method on the Array prototype.

**Options Compared**

The benchmark compares two options:

* For Loop Mapping: A manual, iterative approach using a `for` loop to create a new array by pushing elements from an original array.
* Built-in Map Function: Leveraging the optimized implementation provided by JavaScript's engine (in this case, Google Chrome) for creating a new array from an original array.

**Pros and Cons of Each Approach**

### For Loop Mapping

Pros:

* **Control**: By using a `for` loop, you have complete control over the iteration process, allowing for potential optimizations or custom logic.
* **No Dependencies on Built-in Functions**: This approach doesn't rely on specific built-in functions, making it potentially more portable across different JavaScript implementations.

Cons:

* **Performance**: Manual iteration can be slower than leveraging optimized built-in functions, especially for large datasets.
* **Code Complexity**: Using a `for` loop requires additional logic to manage the iteration process, which can increase code complexity.

### Built-in Map Function

Pros:

* **Performance**: The built-in `map()` function is highly optimized by JavaScript engines and typically provides better performance for large datasets.
* **Concise Code**: This approach uses a single, elegant expression to create a new array from an original array.

Cons:

* **Limited Control**: By relying on the built-in `map()` function, you have limited control over the iteration process.
* **Dependence on Built-in Functions**: Using built-in functions can make the code less portable across different JavaScript implementations or environments with varying levels of optimization.

**Library Usage**

In this benchmark, there is no explicit library usage. The built-in `Array.prototype.map()` function is utilized as-is by the test cases.

**Special JS Features/Syntax (None)**

There are no special JavaScript features or syntax used in these test cases. Both approaches rely on standard JavaScript functionality.

**Alternative Approaches**

Other alternatives to compare with For Loop Mapping and Built-in Map Function include:

* Using `forEach()` instead of a `for` loop for iteration.
* Leveraging `reduce()` for creating a new array from an original array.
* Employing other functional programming techniques, such as using `filter()`, `slice()`, or `every()`.
* Utilizing Web Workers or parallel processing to speed up computation.

Keep in mind that each alternative approach has its own trade-offs in terms of performance, code complexity, and control.

Related benchmarks:

For loop map vs map builtin for 10000000 elements (version: 0)

Comparing performance of: for vs Map

Created: 7 years ago by: Guest

Jump to the latest result

for

Map

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):