Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
isNullish variants 3
(version: 0)
Comparing performance of:
nullish coalescing vs classic vs classic with ==
Created:
4 years ago
by:
Guest
Jump to the latest result
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));
classic
const isNullish = value => value === null || value === undefined; arr.forEach(i => isNullish(i));
classic with ==
const isNullish = value => value == null; arr.forEach(i => isNullish(i));
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
Fork
Test case name
Result
nullish coalescing
classic
classic with ==
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the provided benchmark and explain what's being tested. **Benchmark Definition** The `Script Preparation Code` part of the JSON defines the script that will be used to prepare for each test case. In this case, it's a simple JavaScript loop that generates an array `arr` with 100,000 elements. Each element is assigned a value based on its index: - If the index is divisible by 3, the element is set to its index (i.e., `i`). - If the index leaves a remainder of 1 when divided by 3, the element is set to `null`. - Otherwise, the element is set to `undefined`. **Individual Test Cases** The test cases are designed to compare the performance of different ways to check if a value is "nullish" (i.e., either null or undefined). The values are compared using three different approaches: 1. **Nullish Coalescing (`??` operator)** * **Pros**: This approach is concise and can be expressive, making it easier for developers to understand the intention behind the code. It also avoids explicit checks for `null` and `undefined`. * **Cons**: The performance might not be optimal due to the overhead of evaluating the expression. * **Library/Function:** Not a standard JavaScript function but introduced in ECMAScript 2020. 2. **Classic Null Check (`value === null || value === undefined`)** * **Pros**: This approach is widely supported and can be more readable, especially for developers who are not familiar with the `??` operator. * **Cons**: It requires explicit checks for both `null` and `undefined`, which might make the code harder to read. 3. **Classic Null Check (`value == null`)** * **Pros**: This approach is concise, similar to the first option, but uses a different comparison operator (`==`) instead of the newer `===`. * **Cons:** Similar to the first option, it has the potential for performance issues due to expression evaluation overhead. 4. **Classic Null Check (without `==`)** * **Pros**: This approach avoids using the `==` operator and instead uses a strict equality check (`===`). It's more idiomatic JavaScript, but still may not be optimal due to expression evaluation. **Considerations** - The use of the `??` operator makes the code more concise but might have performance implications. - Avoiding explicit checks for null and undefined can improve readability and maintainability. **Other Alternatives (Not included in this benchmark)** Some alternative approaches could include: * Using a custom function to check for nullish values. * Utilizing the `instanceof` operator to check if an object is a subclass of `Null` or `undefined`. * Implementing a custom optimization, such as using SIMD instructions (for performance-critical applications). Keep in mind that the choice of approach should be based on factors like code readability, maintainability, and performance requirements.
Related benchmarks:
isNullish variants 4
isNullish variants 5
var is a non-empty array (v2)
var is a non-empty array (v3)
Comments
Confirm delete:
Do you really want to delete benchmark?