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?? vs ||
(version: 0)
Comparing performance of:
|| vs ??
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var a = "", b = "";
Tests:
||
var c = a || b
??
var d = a ?? b
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
||
??
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the explanation into smaller parts to make it easier to understand. **What is tested on the provided JSON?** The benchmark tests two different approaches for evaluating a simple conditional expression: `a || b` (using the logical OR operator) and `a ?? b` (using the nullish coalescing operator). In other words, the test measures how fast these two expressions evaluate to true or the value of `b`, respectively. **Options compared** The benchmark compares two approaches: 1. `||`: The logical OR operator is used to evaluate the condition. 2. `??`: The nullish coalescing operator is used to evaluate the condition. **Pros and Cons** Here's a brief summary of each approach: ### Logical OR Operator (`||`) Pros: * Widely supported across browsers and platforms * Easy to understand and implement Cons: * Can be slower due to its inherent logic evaluation process * May require additional checks for null or undefined values, which can add overhead In the context of this benchmark, using `||` may result in slightly slower execution times compared to `??`, especially when dealing with large inputs. ### Nullish Coalescing Operator (`??`) Pros: * Optimized by modern browsers and engines for performance * Provides a more concise and expressive way to handle null or undefined values Cons: * Not as widely supported across older browsers and platforms (although it's gaining traction) * May require additional time to learn and implement, especially for developers unfamiliar with this operator In the context of this benchmark, `??` is likely optimized by modern browsers like Chrome 92, resulting in faster execution times. **Library usage** There doesn't appear to be any explicit library usage in these benchmarks. However, it's worth noting that nullish coalescing (`??`) was introduced as a part of the ECMAScript standard in ES2020 and is now supported by most modern browsers. **Special JS feature or syntax** The benchmark uses a relatively recent JavaScript feature: the nullish coalescing operator (`??`). This operator was introduced in ES2020 and provides a more concise way to handle null or undefined values. It's designed to be more efficient and readable than traditional `||` approaches. If you're not familiar with this operator, consider it an alternative to using explicit null checks (e.g., `a == null ? b : a`) or the logical OR operator (`||`).
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