Benchmark: Assignment of values vs Destructuring of object

Tests:

Assign
const obj = {a: { value: true, d: { hello: true } }, b: true, c: 'hello' }; const a = obj.a; const b = obj.b; const c = obj.c; const d = a.d; console.log(a); console.log(b); console.log(c); console.log(d);
Destructure
const obj = {a: { value: true, d: { hello: true } }, b: true, c: 'hello' }; const {a, b, c} = obj; const { d } = a; console.log(a); console.log(b); console.log(c); console.log(d);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Assign
Destructure

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/605.1.15 (KHTML, like Gecko) Version/11.0 Safari/605.1.15

Browser/OS: Safari 11 on Linux

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Test name	Executions per second
Assign	55649.1 Ops/sec
Destructure	62782.1 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring the performance of JavaScript assignments and destructuring can be an interesting exercise.

**Benchmark Definition**

The benchmark defines two different ways to access properties from an object: assignment and destructuring. The first test case, "Assign", assigns the `value` property of the inner object to a variable using the dot notation (`const d = a.d;`). The second test case, "Destructure", uses destructuring to extract multiple values directly from the object (`const { d } = a;`).

**Options Compared**

The benchmark compares two approaches:

1. **Assignment**: Assigning properties of an object using the dot notation (e.g., `const d = a.d;`)
2. **Destructuring**: Using destructuring to extract multiple values directly from an object (e.g., `const { d } = a;`)

**Pros and Cons**

**Assignment:**

Pros:

* Widely supported by most JavaScript engines
* Easy to understand and implement

Cons:

* May require more memory allocation and copying of data
* Can be slower than destructuring, especially for large objects

**Destructuring:**

Pros:

* Often faster and more efficient than assignment
* Reduces the need for explicit property access and indexing
* Can lead to cleaner and more readable code

Cons:

* Not supported by older JavaScript engines (e.g., IE8)
* May require additional setup or configuration in some environments

**Library and Purpose**

In both test cases, the `obj` variable is an object with nested properties. The `a` and `b` variables are assigned to properties of the outer object using the dot notation (`const a = obj.a;`, `const b = obj.b;`). There are no external libraries used in this benchmark.

**Special JS Feature or Syntax**

There is no special JavaScript feature or syntax used in this benchmark. The tests focus on comparing two common ways to access properties from an object.

**Other Alternatives**

If you're interested in exploring alternative approaches, here are a few options:

* **Spread Operator**: Instead of destructuring, you could use the spread operator (`{ ...obj }`) to create a new object with extracted properties.
* **Array Methods**: You could use array methods like `Object.keys()` and `forEach()` to iterate over the object's properties and extract values.
* **Generator Functions**: Generator functions can be used to iterate over an object's properties without assigning them to individual variables.

Keep in mind that each of these alternatives has its own trade-offs and performance characteristics, which may not be as well-suited for this specific benchmark.

Related benchmarks:

Assignment of values vs Destructuring of object (version: 0)

Comparing performance of: Assign vs Destructure

Created: one year ago by: Guest

Jump to the latest result

Assign

Destructure

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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