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null check or falsy
(version: 0)
Comparing performance of:
check null vs check falsy
Created:
one year ago
by:
Guest
Go to the latest result
Script Preparation code:
const data = {};
Tests:
check null
if(typeof data !== 'object' || data === null) { return false; }
check falsy
if(typeof data !== 'object' || !data) { return false; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
check null
check falsy
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36
Browser/OS:
Chrome 128 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=554443" width="100%" height="500px"></iframe>
check falsy
3.6M/s
check null
3.5M/s
View exact numbers
Test name
Executions per second
✓
check falsy
3,571,329 Ops/sec
check null
3,547,303 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and explain what is tested, compared options, pros and cons, and other considerations. **What is tested:** The benchmark tests two different approaches to check if a variable `data` is either null or falsy (i.e., an empty string, 0, etc.). The test cases are: 1. `check null`: Tests if the variable is null. 2. `check falsy`: Tests if the variable is falsy. **Options compared:** The benchmark compares two approaches to check for null and falsy values: A) `typeof data !== 'object' || data === null` B) `typeof data !== 'object' || !data` Let's analyze each option: **Option A (`typeof data !== 'object' || data === null`)** * This approach checks if the variable is not an object (using `typeof`) and then checks if it's equal to null. * Pros: + Fast, as it only requires a single comparison. + Easy to read and understand. * Cons: + May return incorrect results for non-integer falsy values (e.g., 0, "", etc.). + May not work correctly with some custom objects that don't implement the `toString()` method. **Option B (`typeof data !== 'object' || !data`)** * This approach checks if the variable is not an object (using `typeof`) and then uses the logical NOT operator (!) to check if it's falsy. * Pros: + Works correctly for non-integer falsy values (e.g., 0, "", etc.). + Handles custom objects that don't implement the `toString()` method. * Cons: + Requires a second comparison, which might be slower than Option A. **Other considerations:** Both options are generally acceptable, but depending on the specific use case and requirements, one may be preferred over the other. For example: * If you need to support older browsers that don't understand `typeof` as a boolean expression, Option B might be a better choice. * If you want to optimize for performance, Option A might be a better choice. **Library usage:** None of the test cases use any external libraries. **Special JS features or syntax:** There are no special JavaScript features or syntax used in this benchmark.
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