Benchmark: isNullish variants 5

Script Preparation code:

var arr = [];
var i = 0;

while (i <= 1E5) {
    arr[i] = i % 3 === 0 ? i : i % 3 === 1 ? null : undefined

    i++;
}

Tests:

nullish coalescing
const isNullish = (value) => (value ?? true) === true; arr.forEach(i => isNullish(i));
=== null
const isNullish = value => value === null; arr.forEach(i => isNullish(i));
=== undefined
const isNullish = value => value === undefined; arr.forEach(i => isNullish(i));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
nullish coalescing
=== null
=== undefined

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

I'll explain what's tested in the provided JSON, describe the options compared, and their pros and cons.

**Benchmark Test**

The test measures performance of JavaScript code that checks if a value is nullish (i.e., either null or undefined) using different approaches. The benchmark compares three variants:

1. `=== null`: This option uses the strict equality operator (`===`) to check if a value is null.
2. Nullish Coalescing Operator (`??`): This option uses the coalescing operator, which returns the first operand if it's not null or undefined, and the second operand otherwise.
3. Comparison with `undefined`: This option directly compares a value with `undefined`.

**Library: None**

There are no external libraries used in these benchmark tests.

**Special JS Features/Syntax: Nullish Coalescing Operator (`??`)**

The test uses the nullish coalescing operator, which is a relatively new feature introduced in ECMAScript 2020. This operator allows you to use a single expression to provide a default value when a variable or property might be null or undefined.

**Options Compared**

Here's a brief description of each option:

1. `=== null`:
	* Pros: Simple and efficient.
	* Cons: May not work as expected for all types of values (e.g., NaN, symbols).
2. Nullish Coalescing Operator (`??`):
	* Pros: More readable and maintainable, handles various edge cases.
	* Cons: Newer feature, may have performance implications due to its complexity.
3. Comparison with `undefined`:
	* Pros: Simple and easy to understand.
	* Cons: May be slower than the other two options, as it involves a direct comparison.

**Benchmark Preparation Code**

The preparation code generates an array of 100,000 elements using the script provided in the benchmark definition. Each element is either assigned a value that's a multiple of 3, or set to null or undefined using the script's logic.

**Other Alternatives**

If you were to implement this test yourself, alternative approaches could include:

* Using a switch statement instead of an array
* Utilizing other conditional statements like `if`/`else if`/`else`
* Employing a different data structure, such as a Set or Map

Keep in mind that the chosen approach should balance performance, readability, and maintainability.

Related benchmarks:

isNullish variants 5 (version: 0)

Comparing performance of: nullish coalescing vs === null vs === undefined

Created: 4 years ago by: Guest

Jump to the latest result

nullish coalescing

=== null

=== undefined

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):