Benchmark: Map.get vs Object property access

Script Preparation code:

obj = {foo: 'bar'}
map = new Map(Object.entries(obj))

Tests:

Map
map.get("foo")
Object
obj["foo"]

Historical Performance Data aggregated from 13 community runs

Desktop Results:

Chrome 13 runs

Object

164.6M/s

Map

153.3M/s

View exact numbers

✓ Object: 164,624,112 ops/sec
• Map: 153,306,752 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Map
Object

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36

Browser/OS: Chrome 140 on Windows

View result in a separate tab

Object

227.0M/s

Map

201.0M/s

View exact numbers

Test name	Executions per second
✓ Object	227,040,160 Ops/sec
Map	201,044,624 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the explanation into sections.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmark test case on MeasureThat.net. The benchmark compares two approaches to access data: using an object property (`obj["foo"]`) and using the `Map.get()` method (`map.get("foo")`).

**Options Compared**

There are only two options being compared:

1. **Object Property Access**: This approach uses the dot notation or bracket notation to access a property of an object, e.g., `obj["foo"]`. It's a common way to access data in JavaScript.
2. **Map.get() Method**: This approach uses the `Map` class's `get()` method to retrieve a value by its key, e.g., `map.get("foo")`.

**Pros and Cons of Each Approach**

### Object Property Access

Pros:

* Wide adoption and support across modern browsers
* Often considered more intuitive for accessing data in objects
* Typically faster due to caching and tree shaking optimization

Cons:

* Can lead to slower performance if the object is not cached or if it's very large
* May be less efficient than Map.get() in some cases, especially when dealing with sparse objects

### Map.get() Method

Pros:

* Optimized for lookups and provides a more efficient way to access data in maps
* Can be faster than object property access due to caching and tree shaking optimization
* Allows for better handling of sparse data and edge cases

Cons:

* Less intuitive for accessing data, especially for developers not familiar with Maps
* May require additional setup or creation of a Map instance
* Not as widely adopted or supported across older browsers

**Library Usage**

In this benchmark, the `Map` class is used. The `Map` class is a built-in JavaScript object that allows you to store and retrieve values by their keys.

The purpose of using `Map.get()` in this benchmark is to demonstrate its performance compared to accessing data through an object property.

**Special JS Features or Syntax**

In this benchmark, there are no special JavaScript features or syntax being used. The test cases only utilize basic JavaScript constructs like objects, Maps, and dot notation.

**Alternatives**

Other alternatives for comparing these two approaches could include:

* Using a custom class or function to simulate an object or Map
* Utilizing a different data structure, such as an array or set
* Implementing a hybrid approach that combines elements of both methods

Keep in mind that the choice of alternative will depend on the specific requirements and goals of the benchmark.

**Benchmark Preparation Code**

The provided `Script Preparation Code` initializes two variables: `obj`, which represents an object with a single property, and `map`, which is created from `Object.entries(obj)`. This setup allows for a direct comparison between accessing data through an object property (`obj["foo"]`) and using the `Map.get()` method (`map.get("foo")`).

Map.get vs Object property access (version: 0)

Comparing performance of: `Map vs Object`

Created: 3 years ago by: Guest

Go to the latest result

Map

Object

Historical Performance Data aggregated from 13 community runs

Desktop Results:

Chrome 13 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Map.get vs Object property access (version: 0)

Comparing performance of: Map vs Object

Created: 3 years ago by: Guest

Go to the latest result

Map

Object

Historical Performance Data aggregated from 13 community runs

Desktop Results:

Chrome 13 runs

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: `Map vs Object`