Benchmark: Object access vs destructing

Script Preparation code:

var obj = {
    a: {
        b: {
            c: "ololo",
            d: 123
        }
    }
};

Tests:

direct access
console.log(obj.a.b.c, obj.a.b.d);
destructing
const {c, d} = obj.a.b; console.log(c, d);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
direct access
destructing

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser/OS: Chrome 130 on Linux

View result in a separate tab

Test name	Executions per second
direct access	346629.5 Ops/sec
destructing	347016.2 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**What is being tested?**

The test measures the performance difference between two approaches to accessing an object's properties:

1. **Direct Access**: Using the dot notation (`obj.a.b.c`) to directly access nested properties of an object.
2. **Destructuring**: Using destructuring syntax (`const {c, d} = obj.a.b;`) to extract multiple values from a nested object.

**Options compared**

The test compares two approaches:

* Direct Access: `console.log(obj.a.b.c, obj.a.b.d);`
* Destructuring: `const {c, d} = obj.a.b; console.log(c, d);`

**Pros and Cons of each approach:**

* **Direct Access**:
	+ Pros: Simple, straightforward, and easy to understand.
	+ Cons: Can be slower due to the need to access multiple properties sequentially.
* **Destructuring**:
	+ Pros: Often faster than direct access since it can reduce the number of property accesses.
	+ Cons: May require more code, and some developers might find it less intuitive or easier to read.

**Library usage**

There is no explicit library mentioned in this benchmark. However, JavaScript's built-in object properties are being used.

**Special JS feature/syntax**

No special features or syntax are being tested in this benchmark.

Now, let's talk about other alternatives that could be used for similar benchmarks:

* **Caching**: Implementing caching mechanisms can help reduce the number of property accesses and improve performance.
* **Memoization**: Memoization is a technique where the results of expensive function calls are cached so that they can be reused instead of recalculated. This can be applied to object access patterns.
* **Optimized Property Access**: Some modern JavaScript engines have optimized property access mechanisms, such as the `Object.prototype.hasOwnProperty.call()` method, which can improve performance.

Keep in mind that this benchmark is focused on measuring the performance difference between direct access and destructuring, so other alternatives might not be directly applicable.

Related benchmarks:

Object access vs destructing (version: 0)

Comparing performance of: direct access vs destructing

Created: 4 years ago by: Guest

Jump to the latest result

direct access

destructing

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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