Benchmark: arr.pop() vs arr.shift() vs arr[0]

Script Preparation code:

var arr = [999];

Tests:

arr.pop()
arr.pop();
arr.shift()
arr.shift();
arr[0]
arr[0];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
arr.pop()
arr.shift()
arr[0]

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36

Browser/OS: Chrome 92 on Windows

View result in a separate tab

Test name	Executions per second
arr.pop()	4059362.0 Ops/sec
arr.shift()	4845291.5 Ops/sec
arr[0]	5830619.0 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!

**What is tested?**

The provided JSON represents a benchmark that compares the performance of three different ways to access and remove elements from an array in JavaScript: `arr.pop()`, `arr.shift()`, and simply accessing the first element `arr[0]`.

**Options compared**

There are two main approaches being compared:

1. **Array methods**: `arr.pop()` and `arr.shift()`. These methods modify the original array and remove elements from both ends.
2. **Element access**: `arr[0]`, which simply accesses the first element of the array.

**Pros and Cons**

**Array methods (pop() and shift())**

Pros:

* Both methods are concise and easy to read.
* They are designed for their specific use cases, with `shift()` removing elements from the beginning of the array and `pop()` removing elements from the end.

Cons:

* They modify the original array, which may not be desirable in some situations.
* The performance difference between the two methods is relatively small compared to other operations.

**Element access (arr[0])**

Pros:

* This method does not modify the original array.
* It can be more efficient than using array methods, as it avoids the overhead of modifying the array.

Cons:

* It may not be as readable or intuitive as using array methods.
* It requires careful consideration to avoid accessing elements out of bounds.

**Library usage**

There is no library explicitly mentioned in the benchmark definition. However, some implementations of `arr.pop()` and `arr.shift()` might use libraries like `lodash` or `underscore` for their implementation details.

**Special JavaScript features or syntax**

None are explicitly mentioned. However, it's worth noting that some modern browsers (like Chrome) have implemented some optimizations for array methods, such as using a "stack-based" approach to avoid creating temporary arrays.

**Other alternatives**

If you want to explore more alternatives, here are a few options:

* Use `Array.prototype.at()` or `Array.prototype.get()`, which provide safer and more efficient ways to access elements in arrays.
* Implement your own array methods using JavaScript functions or other libraries like `ramda`.
* Consider using data structures other than arrays, such as linked lists or stacks, for specific use cases.

For the provided benchmark, it's essential to keep in mind that the performance difference between these three approaches might be relatively small, and the choice of implementation depends on the specific requirements of your project.

Related benchmarks:

arr.pop() vs arr.shift() vs arr[0] (version: 0)

Comparing performance of: arr.pop() vs arr.shift() vs arr[0]

Created: 3 years ago by: Guest

Jump to the latest result

arr.pop()

arr.shift()

arr[0]

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):