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instanceof vs null
(version: 0)
Comparing performance of:
intance vs null
Created:
5 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var obj = {};
Tests:
intance
obj instanceof Object
null
obj === null
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
intance
null
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36 Edg/126.0.0.0
Browser/OS:
Chrome 126 on Mac OS X 10.15.7
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=531560" width="100%" height="500px"></iframe>
null
28.2M/s
intance
11.2M/s
View exact numbers
Test name
Executions per second
✓
null
28,222,014 Ops/sec
intance
11,179,979 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested. **Benchmark Purpose** The primary purpose of this benchmark is to compare the performance of JavaScript code that checks if an object is an instance of the `Object` class versus simply checking if it's equal to `null`. **Comparison Options** Two options are compared in this benchmark: 1. `obj instanceof Object`: This option checks if the `obj` variable is an instance of the `Object` class, which means it must have at least one of its own properties (like `toString()`, `constructor`, etc.) or be a function. 2. `obj === null`: This option simply checks if the `obj` variable is equal to `null`. **Pros and Cons** * **`obj instanceof Object`**: + Pros: More accurate, as it checks for specific properties and constructor functions that define an object. + Cons: May be slower due to additional checks. * **`obj === null`**: + Pros: Fastest option, as it only checks for equality with `null`. + Cons: Less accurate, as it doesn't consider the presence of other properties. **Library and Special JS Features** There is no explicit library mentioned in this benchmark. However, the use of `instanceof` operator implies that the JavaScript engine being tested supports this operator. The `instanceof` operator is a special feature introduced in ECMAScript 5 (ES5) that allows checking if an object is an instance of a particular constructor function or class. **Other Considerations** When writing performance-critical code, developers often need to consider these factors: * **Null checks**: In some cases, null checks can be slower than other methods. However, in many situations, the difference is negligible. * **Object property access**: When working with objects, accessing specific properties or checking if an object has certain properties can have a performance impact. **Alternatives** If you're interested in exploring alternative approaches for comparing objects to `null` or `undefined`, consider the following options: * Using `typeof` operator instead of `instanceof`: `typeof obj === 'object'` * Using a custom function to check if an object is null or undefined * Using a library like Lodash's `isNil()` function Keep in mind that these alternatives may not provide identical performance characteristics as the `instanceof` operator. I hope this explanation helps you understand what's being tested in this benchmark!
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