Benchmark: loops performance mapping

Tests:

from
const array = Array.from({length: 1000}).map((_, i) => i * 2)
for
const array = [] for(let i = 0; i < 1000; i++){ array.push(i * 2) }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
from
for

Fastest: N/A

Slowest: N/A

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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.

**What is being tested?**

The provided JSON represents two benchmark test cases: "loops performance mapping" and its two variants, "from" and "for". The tests aim to compare the performance of array creation methods using modern JavaScript features.

**Options compared:**

The two options being compared are:

1. **Array.from()**: This method creates a new array by transforming an existing array-like object into a new array.
2. **For loop with push()**: This is a traditional way of creating arrays in JavaScript, where a for loop is used to iterate and add elements to the array.

**Pros and cons:**

* **Array.from():**
	+ Pros:
		- More concise and expressive syntax.
		- Often faster than traditional loops due to its optimized implementation.
	+ Cons:
		- Less control over the iteration process.
		- May not work well with all types of arrays (e.g., sparse arrays).
* **For loop with push():**
	+ Pros:
		- More control over the iteration process and array indexing.
		- Works well with most types of arrays.
	+ Cons:
		- Less concise and more verbose syntax.

**Library usage:**

There is no explicit library mentioned in the provided JSON. However, it's worth noting that both Array.from() and for loops rely on internal JavaScript APIs and optimizations, which are considered part of the standard language specification.

**Special JS features or syntax:**

There are no special JavaScript features or syntax explicitly mentioned in the test cases. The code uses modern JavaScript features like arrow functions (in the benchmark definition script) but these are not unique to the specific use case being tested.

**Other alternatives:**

If you're interested in exploring alternative array creation methods, here are a few examples:

* **Array constructor**: `new Array(1000)` creates an array with 1000 elements.
* **String repeat() method**: `(new Array(1000)).fill(2 * i).join()` (note that this creates a string of repeated values, not a traditional array).
* **Map or Set creation**: While not directly equivalent to arrays, Map or Set objects can be used to create collections with similar functionality.

These alternatives might have different performance characteristics, syntax, and use cases compared to Array.from() and for loops.

Related benchmarks:

loops performance mapping (version: 0)

Comparing performance of: from vs for

Created: 3 years ago by: Guest

Jump to the latest result

from

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):