Benchmark: Array.from or map

Tests:

Array.from
Array.from([1, 2, 3], x => x + x)
map
[1,2,3].map(x => x + x);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.from
map

Fastest: N/A

Slowest: N/A

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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 definition and test cases.

**Benchmark Definition:**

The benchmark is testing two approaches to perform a simple operation on an array of numbers. The operation is to add each number to itself. The benchmark definition provides two options:

1. `Array.from([1, 2, 3], x => x + x)`: This approach uses the `Array.from()` method with a callback function to create a new array from an existing iterable (in this case, the array `[1, 2, 3]`). The callback function takes each element of the array and adds it to itself.
2. `[1,2,3].map(x => x + x);`: This approach uses the `map()` method on a plain old JavaScript array `[1, 2, 3]`. The callback function takes each element of the array and adds it to itself.

**Options Comparison:**

The two approaches have different characteristics:

* **Performance**: The `Array.from()` method is generally faster than the `map()` method because it creates a new array in a single step, whereas `map()` returns a new array with the modified elements, which may incur additional overhead.
* **Memory Usage**: Both methods create a new array, but the size of the new array differs. The `Array.from()` method creates an array with the same length as the original array, while the `map()` method creates a new array with one more element (the sum of all elements).
* **Readability and Expressiveness**: The `map()` method is often considered more readable and expressive because it clearly conveys the intention of applying a transformation to each element of an iterable.

**Pros and Cons:**

* **Array.from()**
	+ Pros:
		- Faster performance
		- More explicit control over array creation
	+ Cons:
		- Less readable for some developers (more verbose)
* **map()**
	+ Pros:
		- More readable and expressive
		- Works with any iterable (not just arrays)
	+ Cons:
		- Slower performance compared to `Array.from()`
		- May incur additional overhead due to the creation of a new array

**Library/Functionality Usage:**

In this benchmark, no libraries or functions other than built-in JavaScript are used.

**Special JS Features/Syntax:**

The benchmark uses two modern JavaScript features:

* **Arrow Functions**: Both callbacks use arrow function syntax (`x => x + x`) to define the transformation function.
* **Template Literals**: The `Array.from()` callback does not explicitly use template literals, but it's worth noting that they are a more concise way to write string templates in JavaScript.

**Other Alternatives:**

If you wanted to compare these approaches with others, here are some alternatives:

* **Using loops**: Instead of using `map()` or `Array.from()`, you could use a traditional loop (e.g., `for` or `forEach`) to iterate over the array and apply the transformation.
* **Using `reduce()``: The `reduce()` method can be used to accumulate the sum of elements in an array. However, this approach would not be suitable for this specific benchmark because it does not directly compare the performance of `map()` and `Array.from()`.
* **Using a third-party library**: If you wanted to use a third-party library that provides optimized implementations of these operations, you could consider using libraries like Fast.js or Microjs. However, the purpose of this benchmark is to test built-in JavaScript functionality, not external libraries.

I hope this explanation helps!

Related benchmarks:

Array.from or map (version: 0)

Comparing performance of: Array.from vs map

Created: 3 years ago by: Guest

Jump to the latest result

Array.from

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):