Benchmark: Array of nulls - MeasureThat.net

Tests:

Create: Push
const a = []; for(let i = 0; i < 1000; i++) a.push(null);
Create: Fill
const a = (new Array(1000)).fill(null);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Create: Push
Create: Fill

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.128 Safari/537.36

Browser/OS: Chrome 89 on Mac OS X 10.14.6

View result in a separate tab

Test name	Executions per second
Create: Push	254400.6 Ops/sec
Create: Fill	329731.7 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**What is tested?**

The provided JSON represents two test cases that measure the performance of creating arrays with null values using two different approaches: `push` and `fill`. The test cases aim to evaluate which approach is faster, more efficient, and scalable for large array sizes.

**Options compared**

Two options are compared:

1. **Create with push**: This method involves creating an empty array and then pushing null values onto it using a loop.
2. **Create with fill**: This method uses the `fill` method to create a new array filled with null values.

**Pros and cons of each approach:**

* **Push:**
	+ Pros:
		- Easy to understand and implement
		- Can be used for arrays of any size
	+ Cons:
		- May be slower due to the overhead of creating an array and then pushing elements onto it
		- May require more memory allocation, as each push operation creates a new element in the array
* **Fill:**
	+ Pros:
		- Faster, as it uses optimized C++ code under the hood
		- More efficient, as it allocates all null values at once
	+ Cons:
		- May be less intuitive or harder to understand for developers unfamiliar with the `fill` method
		- Limited to arrays of a fixed size ( specified by the second argument)

**Library and purpose**

In this case, there is no library explicitly mentioned. However, the use of JavaScript's built-in `Array.prototype.fill()` method suggests that the developers aim to leverage optimized C++ code for array creation.

**Special JS feature or syntax**

The `fill` method uses a JavaScript feature called **"method chaining"**, which allows for a concise way of creating arrays by calling methods on existing objects (in this case, `new Array(1000)`). Method chaining is a powerful technique in JavaScript that can improve code readability and conciseness.

**Other alternatives**

In the context of creating arrays with null values, other alternatives might include:

1. Using `Array.from()` method to create an array from an iterable (e.g., a generator function or an array-like object).
2. Utilizing libraries like Lodash or Underscore.js for more advanced array manipulation and creation techniques.
3. Exploring different data structures, such as typed arrays (e.g., `Int8Array`) or WebAssembly arrays, which might offer better performance for specific use cases.

In summary, the MeasureThat.net benchmark provides valuable insights into the performance differences between creating arrays with null values using two popular approaches: `push` and `fill`. By understanding the pros and cons of each method, developers can choose the most suitable approach for their specific use cases.

Related benchmarks:

Array of nulls (version: 0)

Comparing performance of: Create: Push vs Create: Fill

Created: 3 years ago by: Guest

Jump to the latest result

Create: Push

Create: Fill

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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