Benchmark: Test push, Array from

Script Preparation code:

var arrayLength = 999;

Tests:

push
var arr = [] for (let i = 0; i < arrayLength; i++) { arr.push(i); }
Array From
var arr = Array.from({length: arrayLength}, () => null) arr.forEach((v,i) => { arr[i] = i; })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
push
Array From

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser/OS: Chrome 121 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
push	30981.9 Ops/sec
Array From	36004.8 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark test case. It defines two different approaches to creating an array in JavaScript:

1. **Using the `push()` method**: This approach creates an empty array `arr` and then uses a `for` loop to push elements onto it.
2. **Using the `Array.from()` method with a callback function**: This approach creates an array from an object literal using the `Array.from()` method, which takes a length parameter and a callback function that returns each element.

**What's being tested**

The benchmark is testing the performance of these two approaches in creating an array. The goal is to determine which approach is faster for large arrays.

**Options compared**

Two options are being compared:

1. **`push()` method**: This is a simple and widely supported way to add elements to an array.
2. **`Array.from()` method with a callback function**: This is a more modern and efficient way to create arrays, especially when dealing with large datasets.

**Pros and Cons of each approach**

**`push()` method:**

Pros:

* Widely supported and easy to understand
* Works well for small to medium-sized arrays

Cons:

* Can be slower than `Array.from()` for very large arrays due to the overhead of the loop
* May not be as efficient in terms of memory usage

**`Array.from()` method with a callback function:**

Pros:

* Faster performance, especially for large arrays
* More memory-efficient than the `push()` method
* Supports creating arrays from other iterable objects (e.g., strings, arrays)

Cons:

* Requires support for modern JavaScript features (i.e., the `Array.from()` method and arrow functions)
* May be less intuitive for some developers due to the use of callback functions

**Library and special JS feature**

Neither of these approaches uses a specific library. However, if we were to analyze the code, we could see that the `push()` method is using a built-in JavaScript function, while the `Array.from()` method is using a modern JavaScript standard feature (ECMAScript 2015).

**Other considerations**

In addition to performance and memory usage, other factors like code readability, maintainability, and compatibility across different browsers and platforms should also be considered when choosing between these approaches.

**Alternatives**

If you're looking for alternative ways to create arrays in JavaScript, some options include:

* Using `Array.prototype.fill()` or `new Array(length)` to fill an array with a single value
* Using `Buffer.alloc()` to create a typed array
* Using third-party libraries like Lodash or Ramda for more advanced array manipulation and creation capabilities

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

Related benchmarks:

Test push, Array from (version: 0)

테스트

Comparing performance of: push vs Array From

Created: 2 years ago by: Guest

Jump to the latest result

push

Array From

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):