Benchmark: Array elements adding

Script Preparation code:

var str = "";
var i;

Tests:

by index
var sArr = []; 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:

No previous 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 world of MeasureThat.net and explore what's being tested in this benchmark.

**Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON data represents two test cases, each designed to measure the performance difference between two approaches: accessing array elements by index versus using the `push` method.

**Benchmark Definitions**

The benchmark definitions are represented as strings of JavaScript code. There are two test cases:

1. "by index":
```javascript
var sArr = [];
for (i = 1000; i > 0; i--) {
  sArr[i] = i;
}
```
This code creates an array `sArr` and populates it with values from 1000 to 1, assigning each value to a specific index in the array.

2. "by push":
```javascript
var sArr = [];
for (i = 1000; i > 0; i--) {
  sArr.push(i);
}
```
This code creates an array `sArr` and pushes values from 1000 to 1 onto the end of the array, without explicitly assigning them to specific indices.

**Options Compared**

The two test cases compare the performance difference between accessing array elements by index (using `sArr[i]`) versus using the `push` method (using `sArr.push(i)`).

**Pros and Cons**

**Accessing Array Elements by Index:**

Pros:

* Direct access to specific indices can be more efficient for small arrays.
* Can be more readable and maintainable code.

Cons:

* Requires manual indexing, which can lead to errors or off-by-one issues if not done correctly.
* May result in slower performance due to the overhead of accessing array elements by index.

**Using `push` Method:**

Pros:

* Convenient and concise way to add elements to an array without worrying about indices.
* Often faster than accessing individual elements by index, especially for large arrays.

Cons:

* Can lead to slower performance if not implemented efficiently (e.g., using a sparse array).
* May result in more memory allocation and deallocation overhead due to the dynamic resizing of the array.

**Library and Syntax Considerations**

Neither test case uses any specific libraries or syntax features beyond standard JavaScript. However, it's worth noting that the use of `for` loops with explicit indexing can be less common in modern JavaScript development, where array methods like `forEach`, `map`, and `filter` are often preferred.

**Other Alternatives**

If you want to explore alternative approaches for accessing or manipulating arrays, here are a few options:

1. Array methods: Instead of using indexing or the `push` method, consider using array methods like `forEach`, `map`, or `filter`. These can be more concise and expressive but may have different performance characteristics.
2. Iterators: Use an iterator (e.g., `Array.prototype[Symbol.iterator]`) to iterate over the array elements without accessing them directly. This approach can provide better control over iteration but might require additional setup.
3. Typed Arrays: Consider using typed arrays like `Int32Array` or `Float64Array` for specific types of data, which can provide better performance and memory efficiency.

Keep in mind that these alternatives may have different implications for readability, maintainability, and performance, so choose the approach that best fits your use case and requirements.

Related benchmarks:

Array elements adding (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):