Benchmark: delete operator VS Map.delete

Script Preparation code:

var map = new Map();
var obj = {};

for (let i = 0; i < 1000; i++) {
    map.set(`field${i}`, "value");
    obj[`field${i}`] = "value";
}

Tests:

Map.delete
map.delete('field500');
delete
delete map.field500;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Map.delete
delete

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:108.0) Gecko/20100101 Firefox/108.0

Browser/OS: Firefox 108 on Windows 8.1

View result in a separate tab

Test name	Executions per second
Map.delete	25043760.0 Ops/sec
delete	34269548.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down what's being tested in the provided JSON benchmark.

**Overview**

The benchmark compares two approaches to delete properties from an object: using the `delete` operator and using the `Map.delete()` method.

**Options Compared**

There are two options being compared:

1. **Using the `delete` operator**: This approach uses the built-in JavaScript operator to delete a property from an object.
2. **Using `Map.delete()`**: This approach uses the `Map` data structure to store key-value pairs, and then deletes the key from the map using its `delete()` method.

**Pros and Cons**

**Delete Operator**

Pros:

* Lightweight: Using the `delete` operator is a simple and lightweight way to delete properties.
* Efficient: The `delete` operator is optimized for performance and can be very fast.

Cons:

* May not work as expected if the property name contains special characters or is a reserved keyword.
* Can lead to unexpected behavior if the object has other properties with the same name.

**Map.delete()**

Pros:

* Robust: Using `Map.delete()` ensures that the key is properly removed from the map, even if there are conflicts with other keys.
* Flexible: Maps can store values of different types, making them suitable for more complex data structures.

Cons:

* Heavier: Using a map to delete properties requires additional memory and overhead.
* Slower: Accessing and deleting elements in a map can be slower than using the `delete` operator directly.

**Library Used**

In this benchmark, the `Map` library is used. Maps are a built-in JavaScript data structure that allows you to store key-value pairs. They provide efficient lookups, insertions, and deletions, making them suitable for many use cases.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax being tested in this benchmark. However, it's worth noting that the `Map` data structure was introduced in ECMAScript 2015 (ES6) as a way to improve performance and flexibility when working with objects.

**Other Alternatives**

If you were to rewrite this benchmark using different approaches, some alternatives could be:

* Using `Object.keys()` and `Array.prototype.forEach()` to iterate over the object's properties and delete them.
* Using a library like Lodash or Underscore.js that provides utility functions for working with objects and arrays.
* Using a caching mechanism to store frequently accessed data, rather than relying on the `Map` data structure.

Keep in mind that these alternatives may have different trade-offs in terms of performance, memory usage, and complexity.

Related benchmarks:

delete operator VS Map.delete (version: 0)

Comparing performance of: Map.delete vs delete

Created: one year ago by: Guest

Jump to the latest result

Map.delete

delete

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):