Benchmark: for...of vs map vs loop for create new data

Script Preparation code:

var array = Array.from({ length: 10000 }, (_, i) => ({ id: i }))

Tests:

for...of
const result = [] for (const e of array) { result.push({ id: e.id + 1 }) }
map
const result = array.map(e => ({ id: e.id + 1 }))
for
const result = [] for (let i = 0; i < array.length; i++) { result.push({ id: array[i].id + 1 }) }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for...of
map
for

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 provided benchmark definition and test cases.

**Benchmark Definition:**

The benchmark is designed to compare three approaches for creating new data:

1. `for...of` loop
2. `map()` function
3. `for` loop (with manual indexing)

**Options Comparison:**

The benchmark compares the execution times of these three approaches for creating a new array with 10,000 elements, where each element is an object with an `id` property. The `id` value is incremented by 1 for each iteration.

**Pros and Cons:**

* **for...of loop:** This approach uses the "for...of" loop, which is a more modern and readable way to iterate over arrays in JavaScript. However, it might not be as efficient as manual indexing or the `map()` function.
	+ Pros: More readable, easier to maintain
	+ Cons: Might be slower than other approaches due to the overhead of the loop
* **map() function:** The `map()` function is a built-in array method that applies a transformation function to each element in an array. It returns a new array with the transformed elements.
	+ Pros: Efficient, concise, and expressive
	+ Cons: Might not be suitable for all types of data or transformations
* **for loop (manual indexing):** This approach uses a traditional `for` loop with manual indexing to iterate over the array.
	+ Pros: Fastest execution time due to minimal overhead
	+ Cons: More verbose and less readable than other approaches

**Library Used:**

None mentioned in the benchmark definition. However, it's worth noting that the `Array.from()` method is used to create a new array with 10,000 elements.

**Special JS Features or Syntax:**

The benchmark uses the `for...of` loop, which is a modern JavaScript feature introduced in ECMAScript 2015 (ES6). It allows iterating over arrays and other iterable objects using a more concise syntax.

In contrast, the `map()` function has been part of the JavaScript standard library since ES3, and its usage is more widespread than the `for...of` loop.

**Alternatives:**

If you're interested in exploring alternative approaches for creating new data, here are some options:

* Using a `forEach()` loop or a recursive function (not included in the benchmark)
* Utilizing `reduce()` method to create an array from an iterable
* Leveraging libraries like Lodash or Ramda for functional programming

Keep in mind that the choice of approach depends on your specific use case, performance requirements, and personal preference.

Related benchmarks:

for...of vs map vs loop for create new data (version: 0)

Comparing performance of: for...of vs map vs for

Created: 2 years ago by: Registered User

Jump to the latest result

for...of

map

for

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):