Benchmark: Comparing destructuring assignment with optional chaining v3

Comparing destructuring assignment with optional chaining v3 (version: 0)

Comparing performance of: Destructuring assignment (undefined) vs Optional chaining (undefined) vs Destructuring assignment (null) vs Optional chaining (null) vs Destructuring assignment (value) vs Optional chaining (value) vs Destructuring assignment (no property) vs Optional chaining (no property)

Created: 4 years ago by: Guest

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Tests:

Destructuring assignment (undefined)
const event = { detail: { someKey: undefined, } } const { someKey } = event.detail || {};
Optional chaining (undefined)
const event = { detail: { someKey: undefined, } } const someKey = event.detail?.someKey;
Destructuring assignment (null)
const event = { detail: { someKey: null, } } const { someKey } = event.detail || {};
Optional chaining (null)
const event = { detail: { someKey: null, } } const someKey = event.detail?.someKey;
Destructuring assignment (value)
const event = { detail: { someKey: 100, } } const { someKey } = event.detail || {};
Optional chaining (value)
const event = { detail: { someKey: 100, } } const someKey = event.detail?.someKey;
Destructuring assignment (no property)
const event = { detail: { } } const { someKey } = event.detail || {};
Optional chaining (no property)
const event = { detail: { } } const someKey = event.detail?.someKey;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Destructuring assignment (undefined)
Optional chaining (undefined)
Destructuring assignment (null)
Optional chaining (null)
Destructuring assignment (value)
Optional chaining (value)
Destructuring assignment (no property)
Optional chaining (no property)

Fastest: N/A

Slowest: N/A

Latest run results:

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

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I'll break down the benchmark and explain what's being tested, compared options, pros and cons, and other considerations.

**Benchmark Purpose**

The benchmark is designed to compare two ways of accessing properties in JavaScript objects: destructuring assignment (using the `=` operator) and optional chaining (using the `.?.` syntax).

**Options Compared**

There are four test cases:

1. **Destructuring assignment with undefined property**: The object has a nested property `detail` with an `undefined` value for the key `someKey`.
2. **Optional chaining with undefined property**: The same object, but using optional chaining to access the `someKey` property.
3. **Destructuring assignment with null property**: The object has a nested property `detail` with a `null` value for the key `someKey`.
4. **Optional chaining with null property**: The same object, but using optional chaining to access the `someKey` property.

**Pros and Cons of Each Approach**

1. **Destructuring Assignment (=`` operator)**
	* Pros:
		+ More readable code
		+ Can be more efficient for simple assignments
	* Cons:
		+ Will throw an error if the property is not present or has a non-assignable value
2. **Optional Chaining (`?.` syntax)**
	* Pros:
		+ Avoids errors and provides a default value (e.g., `undefined`)
		+ More concise code
	* Cons:
		+ May be less readable for some developers
		+ Can have performance implications due to the extra lookup

**Library Used**

None. The benchmark only uses native JavaScript features.

**Special JS Features/Syntax**

The benchmark utilizes a new feature introduced in ECMAScript 2020 (ES12): optional chaining (`?.` syntax). This allows accessing nested properties with a null or undefined value without throwing an error.

**Other Considerations**

* Performance: Measuring the execution speed of each approach can help determine which one is more efficient.
* Code Readability: Comparing the readability and maintainability of code using these two approaches can also be valuable insights.

By running this benchmark, developers can better understand the trade-offs between destructuring assignment and optional chaining in JavaScript.

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