Benchmark: teste length vs pop JS2

Script Preparation code:

Object.defineProperty(Array.prototype, "last", { get: function () { return this[this.length - 1]; } });
var str = 'Abcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxyAbcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxy';

Tests:

length -1
console.log(str.split(' ').last)
pop
console.log(str.split(' ').pop())

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
length -1
pop

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 break down the benchmark and explain what is being tested.

**Benchmark Purpose**

The goal of this benchmark is to compare the performance of two approaches to access the last element in an array using JavaScript: `last` property (using `Array.prototype`) and the `pop()` method. The benchmark aims to determine which approach is faster and more efficient.

**Options Compared**

Two options are being compared:

1. **`last` property**: This approach uses the custom `last` property defined on the `Array.prototype`, which returns the last element of the array.
2. **`pop()` method**: This approach uses the built-in `pop()` method, which removes and returns the last element of the array.

**Pros and Cons**

* **`last` property**:
	+ Pros: Customizable and can be used to access any element in the array using the same syntax.
	+ Cons: May incur additional overhead due to the custom property definition.
* **`pop()` method**:
	+ Pros: Built-in method, no additional overhead, and easy to understand.
	+ Cons: Only available for arrays, not for other data structures.

**Library and Purpose**

In this benchmark, a custom `last` property is defined on the `Array.prototype`. This allows users to access any element in an array using the same syntax as `array[index]`, where `index` is the last element. The purpose of this library-like approach is to provide a convenient way to access the last element without having to use indexing.

**Special JS Feature or Syntax**

There is no special JavaScript feature or syntax used in this benchmark, other than the custom `last` property on the `Array.prototype`. This makes it accessible to users with varying levels of JavaScript knowledge.

**Other Alternatives**

If you want to access the last element of an array without using the `last` property or `pop()` method, you could use indexing (e.g., `array[array.length - 1]`) or a library like Lodash's `_.last()` function.

Here is an example of how you might modify the benchmark code to use indexing:
```javascript
"Script Preparation Code": "var str = 'Abcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxy';"
```
And here is an example of how you might use Lodash's `_.last()` function:
```javascript
"Script Preparation Code": "const _ = require('lodash'); var str = 'Abcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxy';"
```
These alternatives may have different performance characteristics and are not necessarily faster or slower than the `last` property or `pop()` method.

Related benchmarks:

teste length vs pop JS2 (version: 0)

Comparing performance of: length -1 vs pop

Created: 3 years ago by: Guest

Jump to the latest result

length -1

pop

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):