Benchmark: shift 4 filter - MeasureThat.net

Script Preparation code:

var number = +prompt('Enter array length')
var arr = new Array(number).fill(10);

Tests:

filter
console.log(arr) arr.filter((_, i) => i )
shift
arr.shift()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
filter
shift

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser/OS: Chrome 123 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
filter	770.7 Ops/sec
shift	21579154.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested.

**Benchmark Overview**

The test suite, also known as the benchmark, is designed to measure the performance of two specific JavaScript operations: filtering an array using the `filter()` method and shifting elements from the beginning of an array.

**Test Cases**

There are two individual test cases:

1. **Filter Test Case**
	* Benchmark Definition: `arr.filter((_, i) => i)`
	* Purpose: Measure the time it takes to filter a sorted array by only considering the index (`i`) as the filtering condition.
2. **Shift Test Case**
	* Benchmark Definition: `arr.shift()`
	* Purpose: Measure the time it takes to remove and return the first element from an array.

**Options Compared**

In this benchmark, two options are being compared:

1. **Filtering using `filter()`**: This is the most common approach for filtering arrays in JavaScript.
2. **Shifting elements**: This method involves removing and returning the first element of the array without reassigning it to a new array.

**Pros and Cons**

**Filtering using `filter()`**

Pros:

* Fast and efficient, especially when dealing with large arrays
* Allows for arbitrary filtering conditions
* Easy to implement

Cons:

* Creates a new array and assigns it to a variable, which can be memory-intensive
* May not be suitable for use cases where the original array needs to remain unchanged

**Shifting elements**

Pros:

* Does not create a new array or modify the original array
* Can be more memory-efficient than filtering using `filter()`

Cons:

* Only works when shifting from the beginning of an array
* Can lead to performance issues if used incorrectly (e.g., shifting while iterating over the array)

**Library Used**

In this benchmark, no specific library is being used. The `filter()` and `shift()` methods are part of the JavaScript standard library.

**Special JS Feature or Syntax**

There doesn't seem to be any special features or syntax being tested in this benchmark.

**Other Alternatives**

If you're looking for alternative approaches to filtering or shifting arrays, here are a few options:

* For filtering: You can use `Array.prototype.map()` and `Array.prototype.filter()` together to achieve the same result without creating a new array.
* For shifting elements: You can use `Array.prototype.pop()` instead of `shift()`, but this method returns the removed element, not the original value.

For more advanced filtering techniques, you might consider using libraries like Lodash or Ramda.

Related benchmarks:

shift 4 filter (version: 0)

Comparing performance of: filter vs shift

Created: 2 years ago by: Guest

Jump to the latest result

filter

shift

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):