Benchmark: Array elements adding 2

Script Preparation code:

var str = "";
var i;

Tests:

by index
var sArr = Array(1000); for (i = 1000; i > 0; i--) { sArr[i] = i; }
by push
var sArr = []; for (i = 1000; i > 0; i--) { sArr.push(i); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
by index
by push

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 break down the provided JSON and explain what's being tested, compared, and considered.

**Benchmark Definition**

The benchmark definition is a simple JavaScript code that creates an array of 1000 elements and populates it with indices from 1 to 1000. The array can be created either by using the `Array()` constructor with a length parameter or by using the `push()` method to add elements one by one.

**Test Cases**

There are two test cases:

1. **"by index"`**: This test case uses the `Array()` constructor to create an array of 1000 elements and then populates it with indices from 1 to 1000 using a traditional for loop.
2. **"by push"`**: This test case uses the `push()` method to add elements one by one, starting from an empty array.

**Comparison**

The benchmark is comparing the performance of these two approaches:

* Using the `Array()` constructor vs. using the `push()` method

**Pros and Cons**

1. **"by index"`**:
	* Pros: This approach creates the array upfront, which might be faster since it avoids the overhead of creating an empty array and then adding elements one by one.
	* Cons: If the array is larger than the available memory, this approach could lead to performance issues.
2. **"by push"`**:
	* Pros: This approach uses less memory since it creates an empty array that grows dynamically as elements are added.
	* Cons: This approach can be slower since it involves creating and destroying arrays during each execution.

**Library**

There is no explicit library mentioned in the benchmark definition. However, the `push()` method relies on the built-in `Array.prototype.push()` function, which is a part of the JavaScript language standard.

**Special JS Features/Syntax**

None are explicitly mentioned.

**Other Considerations**

When choosing between these two approaches, consider the following:

* If you need to create an array with a fixed size and don't plan to modify it often, using `Array()` might be faster.
* If you need to create an array that grows dynamically or frequently, using `push()` might be more suitable.

**Alternatives**

Other alternatives for creating arrays in JavaScript include:

* Using the spread operator (`[...array]`) to create a new array from an existing one
* Using the `Array.from()` method to create an array from an iterable (e.g., a string, another array)
* Using a library like Lodash or Ramda, which provide alternative array creation methods

Keep in mind that these alternatives might have different performance characteristics and use cases.

Related benchmarks:

Array elements adding 2 (version: 0)

Comparing performance of: by index vs by push

Created: 3 years ago by: Guest

Jump to the latest result

by index

by push

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):