Benchmark: Object Property Access Notation: Destructuring vs. Dot. vs. Bracket

Script Preparation code:

var globalData = {
  data: {
   property: "value",
  },
};

Tests:

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

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: 2 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 Edg/145.0.0.0

Browser/OS: Chrome 145 on Windows

View result in a separate tab

Test name	Executions per second
Destructuring Notation	132000320.0 Ops/sec
Dot Notation	124464320.0 Ops/sec
Bracket Notation	120209424.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmarking test case on MeasureThat.net, which compares the performance of three different ways to access an object's property: destructuring notation (`var { data } = globalData;`), dot notation (`var dot = globalData.data;`), and bracket notation (`var bracket = globalData['data']`). The benchmark is designed to measure the execution speed of these approaches.

**Benchmark Definitions**

The three test cases are defined in the following JSON:

```json
[
    {
        "Benchmark Definition": "var { data } = globalData;",
        "Test Name": "Destructuring Notation"
    },
    {
        "Benchmark Definition": "var dot = globalData.data;",
        "Test Name": "Dot Notation"
    },
    {
        "Benchmark Definition": "var bracket = globalData['data']",
        "Test Name": "Bracket Notation"
    }
]
```

**Options Compared**

The three test cases compare the following options:

1. **Destructuring notation**: `var { data } = globalData;` - This approach uses an object literal to extract a property from another object.
2. **Dot notation**: `var dot = globalData.data;` - This approach uses a period (`.`) to access a nested property.
3. **Bracket notation**: `var bracket = globalData['data']` - This approach uses square brackets (`[]`) to access a property.

**Pros and Cons of Each Approach**

1. **Destructuring notation**
	* Pros: Can be more readable and concise, especially for accessing multiple properties at once.
	* Cons: May have performance overhead due to the parsing and evaluation of the object literal syntax.
2. **Dot notation**
	* Pros: Familiar and widely used syntax, easy to read and write.
	* Cons: May lead to longer code lines and harder-to-read property chains.
3. **Bracket notation**
	* Pros: No performance overhead, can be more efficient for accessing properties with unusual names or those that conflict with keyword identifiers.
	* Cons: Less readable than dot notation, may require more effort to write.

**Library Used**

None of the benchmark definitions explicitly use a library, but it's worth noting that MeasureThat.net itself is built using JavaScript and may rely on some internal libraries or tools for execution.

**Special JS Features or Syntax**

None of the benchmark definitions use any special JavaScript features or syntax beyond what's commonly used in modern JavaScript development.

**Other Alternatives**

If you're interested in exploring other approaches to accessing object properties, here are a few alternatives:

1. **Array destructuring**: `const [data] = globalData;` - This approach uses array destructuring to extract a single property from an object.
2. **Object access with `in` operator**: `var bracket = 'data' in globalData;` - This approach uses the `in` operator to check if a property exists in an object, and then accesses it using square brackets (`[]`) if it does.

These alternatives may offer different performance characteristics or trade-offs between readability and conciseness.

Related benchmarks:

Object Property Access Notation: Destructuring vs. Dot. vs. Bracket (version: 2)

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

Created: 7 years ago by: Registered User

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):