Benchmark: Object Property Access Notation: Destructuring vs. Dot. vs. Bracket with multiple accessing

Script Preparation code:

var globalData = {
  data: {
   data: {
     restaurants : [
       {
         name:"name1",
         adress:"ad1",
         city:"city1"
       },
       {
         name:"name2",
         adress:"ad2",
         city:"city2"
       }
       ]
   },
  },
};

Tests:

Destructuring Notation
var { data : {data : {restaurants}} } = globalData;
Dot Notation
var dot = globalData.data.data.resturants;
Bracket Notation
var bracket = globalData['data']['data']['restaurants']

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Destructuring Notation
Dot Notation
Bracket Notation

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser/OS: Chrome 133 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Destructuring Notation	172313280.0 Ops/sec
Dot Notation	168932944.0 Ops/sec
Bracket Notation	157438512.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided benchmark, hosted on MeasureThat.net, compares the performance of three different notations for accessing nested object properties in JavaScript: Destructuring Notation (`var { data : {data : {restaurants}} } = globalData;`), Dot Notation (`var dot = globalData.data.data.resturants;`), and Bracket Notation (`var bracket = globalData['data']['data']['restaurants']`). The goal of this benchmark is to determine which notation yields the fastest execution times.

**Notations Compared**

1. **Destructuring Notation**: This syntax uses the destructuring assignment feature in JavaScript, introduced in ECMAScript 2015 (ES6). It allows for concise and readable code by reassigning properties from an object.
2. **Dot Notation**: This is a traditional way of accessing nested object properties using dot (`.`) separation. For example, `globalData.data.data.restaurants`.
3. **Bracket Notation**: Also known as the "property access" syntax, this uses square brackets (`[]`) to access nested object properties, similar to Dot Notation.

**Pros and Cons of Each Approach**

*   **Destructuring Notation**:
    *   Pros: More concise and readable code, reduces nesting depth.
    *   Cons: May be less familiar to developers who are not used to ES6 features or those with older JavaScript engines that don't support it.
*   **Dot Notation**:
    *   Pros: Wide adoption, easy to understand for most developers. Suitable for older JavaScript versions (pre-ES6).
    *   Cons: Less readable due to deeper nesting, potentially slower performance.
*   **Bracket Notation**:
    *   Pros: Fast and widely supported, especially in older JavaScript engines. Allows for more complex property access scenarios.
    *   Cons: Less concise than Destructuring Notation, requires additional characters.

**Library and Special JS Features**

None of the provided test cases rely on external libraries or special JavaScript features beyond ES6 syntax (destructuring assignment).

**Alternative Approaches**

Other alternatives to these notations might include:

*   **Array notation**: Accessing nested object properties using array indices instead of dot notation.
*   **Closures**: Using a closure to encapsulate the access logic, reducing nesting depth and improving readability.

Keep in mind that this benchmark focuses on performance comparisons between Destructuring Notation, Dot Notation, and Bracket Notation. Other approaches might offer different trade-offs between conciseness, readability, and performance.

Related benchmarks:

Object Property Access Notation: Destructuring vs. Dot. vs. Bracket with multiple accessing (version: 0)

Comparing performance of: Destructuring Notation vs Dot Notation vs Bracket Notation

Created: 3 years ago by: Guest

Jump to the latest result

Destructuring Notation

Dot Notation

Bracket Notation

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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