Benchmark: Map vs object for deletions

Script Preparation code:

var testMap = new Map();
var testObj = {};

Tests:

Add to Map
testMap.set('testKey', 1);
Add to object
testObj.testKey = 1;
Delete from Map
testMap.delete('testKey');
Delete from object
delete testObj.testKey;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Add to Map
Add to object
Delete from Map
Delete from object

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100101 Firefox/138.0

Browser/OS: Firefox 138 on Windows

View result in a separate tab

Add to object

538.3M/s

Delete from Map

35.8M/s

Delete from object

31.6M/s

Add to Map

18.8M/s

View exact numbers

Test name	Executions per second
✓ Add to object	538,319,104 Ops/sec
Delete from Map	35,772,844 Ops/sec
Delete from object	31,625,660 Ops/sec
Add to Map	18,787,948 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 provided benchmark and explain what is being tested.

**Benchmark Definition**

The benchmark is designed to compare the performance of two data structures in JavaScript: Maps (introduced in ECMAScript 2015) and objects.

**Options Compared**

Two options are being compared:

1. **Maps**: A Map is a data structure that stores key-value pairs, where each key is unique and maps to a specific value.
2. **Objects**: An object is an unordered collection of key-value pairs, where each key is a string or symbol and maps to a specific value.

**Pros and Cons**

**Maps:**

Pros:

* Fast lookup, insertion, and deletion operations (O(1) average case)
* Efficient use of memory for large datasets

Cons:

* May have slower creation times compared to objects
* Not as widely supported in older browsers or JavaScript engines

**Objects:**

Pros:

* Faster creation times compared to Maps
* Wide support across older browsers and JavaScript engines

Cons:

* Slower lookup, insertion, and deletion operations (O(n) average case)
* May lead to memory leaks if not properly managed

**Library and Purpose**

None mentioned in the provided benchmark. However, it's worth noting that some libraries like Lodash or Ramda provide optimized implementations of Maps and objects for performance-critical code.

**Special JS Feature or Syntax**

None mentioned in the provided benchmark.

**Other Considerations**

When choosing between using a Map or an object for data storage, consider the following factors:

* Performance: If you need fast lookup, insertion, and deletion operations, use a Map.
* Memory usage: If memory efficiency is crucial, use a Map.
* Browser support: If you need to support older browsers or JavaScript engines, use an object.

**Alternatives**

Other alternatives for data storage in JavaScript include:

1. **Sets**: Introduced in ECMAScript 2015, Sets provide fast membership testing and insertion/deletion operations (O(1) average case).
2. **WeakMaps**: Introduced in ECMAScript 2015, WeakMaps provide a way to store objects as values in a Map, allowing for efficient garbage collection.
3. **Arrays**: Arrays are a more traditional data structure that can be used for storing key-value pairs or other types of data.

Keep in mind that the choice of data structure ultimately depends on the specific requirements and constraints of your project.

Map vs object for deletions (version: 0)

Checks the performance of deletions and additions to Maps vs objects

Comparing performance of: `Add to Map vs Add to object vs Delete from Map vs Delete from object`

Created: 4 years ago by: Registered User

Go to the latest result

Add to Map

Add to object

Delete from Map

Delete from object

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Map vs object for deletions (version: 0)

Checks the performance of deletions and additions to Maps vs objects

Comparing performance of: Add to Map vs Add to object vs Delete from Map vs Delete from object

Created: 4 years ago by: Registered User

Go to the latest result

Add to Map

Add to object

Delete from Map

Delete from object

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `Add to Map vs Add to object vs Delete from Map vs Delete from object`