Benchmark: Destructure first elem vs pop

Script Preparation code:

var arr = []

for (let i = 0; i < 50; i++) {
    arr.push(i);
}

Tests:

Destructure first elem
var [firstElem, ...rest] = arr;
.pop()
var lastElem = arr.pop();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Destructure first elem
.pop()

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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I'll break down the provided benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark is designed to compare two approaches for accessing an element in an array: destructuring (`var [firstElem, ...rest] = arr;`) and using `pop()` method. The benchmark creates a large array with 50 elements and measures how fast each approach can execute.

**Destructure First Elem vs Pop**

The test cases are:

1. **Destructure first elem**: This approach uses destructuring to extract the first element of the array directly.
2. **Pop()**: This approach uses the `pop()` method to remove and return the last element of the array.

**Options Compared**

Two options are compared in this benchmark:

* Destructure (`var [firstElem, ...rest] = arr;`)
* Pop() method (`var lastElem = arr.pop();`)

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

1. **Destructuring (First Elem)**
	* Pros:
		+ Fastest way to access the first element.
		+ Can be more efficient for large arrays since it doesn't require iterating over all elements.
	* Cons:
		+ Only works with modern JavaScript versions that support destructuring assignment.
2. **Pop() Method**
	* Pros:
		+ Works on any array, regardless of its size or structure.
		+ Can be useful when you need to remove and return an element without modifying the original array.
	* Cons:
		+ Requires iterating over all elements in the array, making it slower than destructuring for large arrays.

**Library and Special JS Features**

None are mentioned in this benchmark. However, note that modern JavaScript versions (ES6+) support destructuring assignment, which is used in the first test case.

**Alternative Approaches**

Other alternatives to consider when accessing an element in an array include:

* Indexing (`arr[0]`)
* Using `forEach()` or other methods with callback functions
* Creating a new array with only the desired element using slicing (`arr.slice(1)`)
* Using a library like Lodash's `takeRight` function

These alternatives may have different performance characteristics, syntax requirements, and use cases compared to the destructuring approach used in this benchmark.

Related benchmarks:

Destructure first elem vs pop (version: 0)

Comparing performance of: Destructure first elem vs .pop()

Created: 3 years ago by: Guest

Jump to the latest result

Destructure first elem

.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):