Benchmark: delete vs slice - MeasureThat.net

Script Preparation code:

var array = [1, 2, 3, 4, 5];
var index = 3;

Tests:

delete
delete array[index];
slice
array = array.slice(index, 1);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
delete
slice

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

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

**What's being tested?**

The benchmark is testing two different ways to remove an element from an array: using the `delete` keyword and using the `slice()` method. The test script prepares an array `array = [1, 2, 3, 4, 5];` with a specific index `index = 3;`.

**Options compared**

The two options being compared are:

1. **Delete**: Using the `delete` keyword to remove the element at the specified index.
```javascript
delete array[index];
```
2. **Slice**: Using the `slice()` method to create a new array with the element removed.
```javascript
array = array.slice(index, 1);
```

**Pros and Cons of each approach**

**Delete**

Pros:

* Simple and concise syntax
* Only affects the local scope of the delete statement

Cons:

* May not work as expected in certain scenarios (e.g., if the index is a property name or a function call)
* Can be slower than other methods due to the overhead of searching for the element to delete

**Slice**

Pros:

* More flexible and robust than `delete` (e.g., can remove elements from an array while preserving its length)
* Generally faster than `delete` since it creates a new array without modifying the original one

Cons:

* Requires more code and is less concise
* May consume more memory if creating a large number of arrays with missing elements

**Other considerations**

* In modern JavaScript, both approaches are generally equivalent in terms of performance. However, some older browsers or engines might exhibit different behavior.
* The `delete` keyword is mostly used for removing properties from objects, while the `slice()` method is more commonly used for array manipulation.

**Library usage**

In this benchmark, no specific library is being used.

**Special JS feature/syntax**

The only special aspect of this benchmark is that it uses a unique syntax in the test script preparation code:
```javascript
var index = 3;
```
This sets a variable `index` to the value `3`, which is later used to access an element in the array.

Latest run results:

Run details: (Test run date: 7 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.98 Safari/537.36

Browser/OS: Chrome 54 on Mac OS X 10.12.2

View result in a separate tab

Test name	Executions per second
delete	4683268.5 Ops/sec
slice	2535763.5 Ops/sec

Related benchmarks:

delete vs slice (version: 0)

Comparing performance of: delete vs slice

Created: 7 years ago by: Guest

Jump to the latest result

delete

slice

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):