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Nullish coalescing V.S. if (native)
(version: 0)
Comparing performance of:
Nullish coalescing vs Logic or operator
Created:
4 years ago
by:
Guest
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Tests:
Nullish coalescing
let v = null for (let i = 1; i < 1e6; i++) v = v ?? "val"
Logic or operator
let v = null for (let i = 1; i < 1e6; i++) if(!v) v = "val"
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Nullish coalescing
Logic or operator
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark test and explain what's being tested. **Benchmark Test** The benchmark test is designed to compare two approaches for nullish coalescing, which is a feature introduced in JavaScript that allows you to use the nullish coalescing operator (`??`) to provide a default value if the expression on its left-hand side is either `null` or `undefined`. **Options being compared** The benchmark test compares two approaches: 1. **Nullish Coalescing Operator (??)**: This approach uses the nullish coalescing operator to assign a default value ("val") if the variable `v` is either `null` or `undefined`. 2. **Logic OR Operator (`!`) + Assignment**: This approach uses the logic OR operator (`!`) to check if `v` is falsy (i.e., `null` or `undefined`). If it is, then the expression on its right-hand side is evaluated and assigned to `v`. **Pros and Cons** 1. **Nullish Coalescing Operator (??)**: * Pros: More concise and expressive way of writing code, especially when working with nullish coalescing. * Cons: May be slower than other approaches due to the overhead of operator overloading. 2. **Logic OR Operator (`!`) + Assignment**: * Pros: Can be faster since it avoids the overhead of operator overloading and uses a simple comparison instead. * Cons: Requires more code and may look less concise compared to the nullish coalescing operator. **Library** None of the benchmark test uses any external libraries. The code is self-contained and only depends on JavaScript's built-in features. **Special JS feature or syntax** The nullish coalescing operator (`??`) was introduced in ECMAScript 2020 (ES10) and is supported by most modern browsers, including Chrome 95, which was used to run the benchmark test. **Other alternatives** If you wanted to implement a different approach for nullish coalescing, some alternatives could be: * Using a separate function that returns the default value if `v` is nullish. * Using the ternary operator (`condition ? expression1 : expression2`) with a conditional statement that checks if `v` is nullish. However, these approaches may not be as concise or efficient as the two options being compared in the benchmark test.
Related benchmarks:
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