Benchmark: flatmap vs for of

Script Preparation code:

var n = 1000

Tests:

flatmap
[...Array(n)].flatMap((x,i) => [++i,i++])
for of
let res = [], i=0; for(const i of Array(n)) res.push(i, i);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
flatmap
for of

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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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 and explain what's being tested.

**What is being tested?**

The benchmark is comparing two approaches to iterate over an array: `flatMap` (from the `Array.prototype` method) and a traditional `for...of` loop. The test case is designed to measure which approach is faster for a specific use case.

**Options compared:**

* **flatMap**: This method iterates over each element of the original array, calling a provided function once for each element. It then returns an array of the results from that function.
* **Traditional `for...of` loop**: This loop manually increments an index variable (`i`) and uses the `of` keyword to iterate over the array.

**Pros and Cons:**

* **flatMap**:
	+ Pros:
		- More concise and readable code
		- Can be faster for certain use cases (like the one in this benchmark)
	+ Cons:
		- May have performance overhead due to function calls and object lookups
		- Limited control over iteration variables and indices
* **Traditional `for...of` loop**:
	+ Pros:
		- More flexible and controllable iteration
		- Can be faster for small arrays or specific use cases (like when you need direct access to the index)
	+ Cons:
		- More verbose and less readable code

**Library:**

The `Array.prototype.flatMap` method is a built-in JavaScript library that provides an efficient way to flatten arrays. In this benchmark, it's used to test its performance compared to a traditional `for...of` loop.

**Special JS feature or syntax:**

There are no special features or syntaxes being tested in this benchmark. It focuses solely on the performance comparison between two iteration approaches.

**Other alternatives:**

If you're interested in exploring alternative approaches, consider:

* **Array.prototype.forEach**: Similar to `for...of`, but with a more traditional approach (e.g., using an index variable and incrementing it manually).
* **`map()` + `reduce()`**: Another way to flatten arrays, using the `map()` method to create a new array and then reducing it.
* **Iterators**: JavaScript has built-in support for iterators, which can provide more flexibility and control over iteration.

Keep in mind that these alternatives might not necessarily improve performance, but they can offer different trade-offs in terms of readability, maintainability, and expressiveness.

Related benchmarks:

flatmap vs for of (version: 1)

Comparing performance of: flatmap vs for of

Created: 2 years ago by: Registered User

Jump to the latest result

flatmap

for of

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):