Benchmark: Compare Nullish coalescing and OR operator

Script Preparation code:

var undefinedList = Array.from({length: 1000})

Tests:

Nullish coalescing operator
const a = undefinedList.reduce((total, item) => {total.push(item ?? true); return total}, [])
Logical OR
const a = undefinedList.reduce((total, item) => {total.push(item || true); return total}, [])

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Nullish coalescing operator
Logical OR

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 definition and test cases for you.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark that compares two operators: nullish coalescing (`??`) and logical OR (`||`).

**Operators Comparison**

1. **Nullish Coalescing Operator (??)**:
	* Purpose: The nullish coalescing operator returns its right operand if the left operand is either null or undefined. It's a new addition to JavaScript, introduced in ECMAScript 2020.
	* Pros:
		+ More readable and concise code, as it eliminates the need for explicit checks for null and undefined values.
		+ Reduces code complexity and improves maintainability.
	* Cons:
		+ May not be supported by older browsers or versions of JavaScript.
2. **Logical OR Operator (||)**:
	* Purpose: The logical OR operator returns its left operand if the expression on the right is falsey (e.g., 0, '', null, undefined).
	* Pros:
		+ Wide support across various browsers and versions of JavaScript.
		+ Easy to understand and implement for those familiar with this syntax.
	* Cons:
		+ Requires explicit checks for falsey values, which can lead to more complex code.

**Library Usage**

There is no library mentioned in the provided JSON. However, the `Array.from` method is used as part of the benchmarking process.

**Special JS Feature/Syntax**

The nullish coalescing operator (`??`) is a special feature introduced in ECMAScript 2020. It's not widely supported across all browsers and versions of JavaScript yet. If you need to support older browsers, you might need to use the logical OR operator (`||`) or implement your own solution.

**Other Alternatives**

If you want to test different operators or approaches, you can consider adding more benchmark definitions with alternative logic, such as:

* Using a ternary operator (`a ? b : c`)
* Implementing a custom null-check function
* Comparing the performance of different JavaScript engines (e.g., V8, SpiderMonkey)

Keep in mind that each alternative will require additional setup and testing to ensure accurate results.

Related benchmarks:

Compare Nullish coalescing and OR operator (version: 0)

Comparing performance of: Nullish coalescing operator vs Logical OR

Created: 4 years ago by: Guest

Jump to the latest result

Nullish coalescing operator

Logical OR

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):