Benchmark: Comparing destructuring assignment with optional chaining v2

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;

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)

Fastest: N/A

Slowest: N/A

Latest run results:

No previous 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 its test cases.

**Benchmark Definition**

The benchmark definition is not explicitly provided in the JSON, but it can be inferred from the individual test cases.

In this benchmark, two approaches are being compared:

1. **Destructuring assignment**: This approach uses the syntax `const { someKey } = event.detail || {};` to extract a value from an object.
2. **Optional chaining**: This approach uses the syntax `const someKey = event.detail?.someKey;` to extract a value from an object.

**Options Compared**

The two approaches are compared in terms of their performance, specifically in terms of the number of executions per second on a desktop machine with Chrome 102 browser and Mac OS X 10.15.7 operating system.

**Pros and Cons**

* **Destructuring assignment**:
	+ Pros: Can be more concise and expressive than optional chaining.
	+ Cons: May lead to faster execution times due to the use of shorthand syntax.
* **Optional chaining**:
	+ Pros: Provides a way to safely access nested properties without throwing an error if the property is undefined or null.
	+ Cons: May lead to slower execution times due to the need for additional checks.

**Libraries and Features**

No specific library or feature is being tested in this benchmark. However, it's worth noting that both destructuring assignment and optional chaining are part of the JavaScript language and do not require any external libraries.

**Special JS Features**

The test cases use the nullish coalescing operator (`||`), which was introduced in ECMAScript 2020. This operator returns its right-hand side if the left-hand side is null or undefined, otherwise it returns its left-hand side.

Other Considerations

* The benchmark only tests specific scenarios where someKey is either undefined, null, or has a value.
* No other factors such as memory usage, cache hits, or browser-specific optimizations are being tested.

**Alternatives**

If you're looking for alternatives to this benchmark, you could consider testing:

1. **Null coalescing operator**: Testing the performance of the nullish coalescing operator (`??`) instead of `||`.
2. **Spread syntax**: Testing the performance of the spread syntax (`{ ...obj }`) for object extraction.
3. **Arrow functions**: Testing the performance of arrow functions for function extraction.

However, it's essential to note that these alternatives may not be directly comparable to this benchmark, as they test different aspects of JavaScript syntax and execution.

Related benchmarks:

Comparing destructuring assignment with optional chaining v2 (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)

Created: 4 years ago by: Guest

Jump to the latest result

Destructuring assignment (undefined)

Optional chaining (undefined)

Destructuring assignment (null)

Optional chaining (null)

Destructuring assignment (value)

Optional chaining (value)

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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