Benchmark: pop() vs splice()

Script Preparation code:

var dbList = {};
for (let i = 0; i < 2000000; i++) {
  dbList[i] = {
	id: i,
	};
}
var idList = Object.keys(dbList);

Tests:

pop() method
const spliced = []; for (let i = 0; i < 100 && idList.length > 0; i++) { spliced.push(idList.pop()); }
splice() method
const spliced = idList.splice(0, 100);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
pop() method
splice() method

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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Let's break down the benchmark and explain what's being tested, compared, and the pros and cons of each approach.

**Benchmark Overview**

The benchmark compares the performance of two methods: `pop()` and `splice()`. The test case creates an array of 2 million objects with a single property (`id`) and then uses these arrays to measure the execution time of both methods.

**Script Preparation Code**

The script preparation code initializes an empty object `dbList` and populates it with 2 million objects, each with an `id` property. The keys of this object are stored in an array `idList`. This is done to create a large dataset that can be used for benchmarking.

**Html Preparation Code**

There is no HTML preparation code provided, which suggests that the benchmark only tests JavaScript performance and doesn't involve any GUI or rendering aspects.

**Benchmark Definition**

The benchmark definition consists of two test cases:

1. `pop() method`: This test case creates an empty array `spliced` and then uses a loop to pop elements from `idList` using the `pop()` method, until 100 elements have been popped or there are no more elements in `idList`. The resulting array is compared to the original array.
2. `splice() method`: This test case creates an empty array `spliced` and then uses a loop to remove the first 100 elements from `idList` using the `splice()` method.

**Comparison of Pop() and Splice() Methods**

The comparison between `pop()` and `splice()` methods can be broken down into the following:

* **Pop() Method**: The `pop()` method removes and returns the last element in an array. This method is typically used when you need to access the most recently added element.
	+ Pros:
		- More predictable behavior, as it always returns the last element.
		- Can be more efficient than `splice()` for small arrays or arrays with a single element.
	+ Cons:
		- Can be slower for large arrays, as it needs to traverse the entire array to find the last element.
* **Splice() Method**: The `splice()` method removes and returns elements from an array, starting at the specified index. This method is typically used when you need to remove a range of elements or insert new elements.
	+ Pros:
		- Can be faster than `pop()` for large arrays, as it can stop traversing the array once it reaches the desired index.
	+ Cons:
		- Less predictable behavior, as the number of elements removed depends on the starting index and length.
		- Can cause more cache misses due to its more complex operation.

**Library Used**

None

**Special JS Feature or Syntax**

There are no special JavaScript features or syntax used in this benchmark. The tests only rely on standard JavaScript methods.

**Other Alternatives**

If you want to test other approaches, here are a few alternatives:

* **Slicing vs Shifting**: Instead of using `pop()` and `splice()`, you could test the performance of slicing an array (`slice()`) or shifting elements in an array (using indexing).
* **Array Manipulation**: You could also test the performance of other array manipulation methods, such as using `map()`, `filter()`, or `reduce()`.
* **Data Structures**: If you want to explore data structures beyond arrays, you could test the performance of objects, sets, or linked lists.

Keep in mind that each alternative may have different pros and cons, depending on the specific use case.

Related benchmarks:

pop() vs splice() (version: 0)

Comparing performance of: pop() method vs splice() method

Created: 3 years ago by: Guest

Jump to the latest result

pop() method

splice() method

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):