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Instanceof VS toString for date comparison
(version: 0)
Comparing performance of:
instanceof vs toString
Created:
one year ago
by:
Guest
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Tests:
instanceof
'a' instanceof Date
toString
Object.prototype.toString.call('a')
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
instanceof
toString
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
3 months ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36
Browser/OS:
Chrome 143 on Mac OS X 10.15.7
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<iframe src="https://measurethat.net/Embed?id=624173" width="100%" height="500px"></iframe>
Test name
Executions per second
instanceof
89353096.0 Ops/sec
toString
50576376.0 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks. **What is being tested?** MeasureThat.net is testing two different approaches to compare dates in JavaScript: 1. `instanceof Date`: This approach uses the `instanceof` operator to check if a value is an instance of the `Date` object. 2. `Object.prototype.toString.call('a')`: This approach uses the `toString()` method on the `Object.prototype` and passes a string `'a'` as an argument. **Options being compared** The two options being compared are: * Using the `instanceof` operator to check if a value is a `Date` object * Using the `toString()` method on `Object.prototype` with a string argument **Pros and Cons of each approach:** 1. `instanceof Date`: * Pros: + Directly checks if a value is a `Date` object, which might be more efficient. + Less chance of type coercion errors. * Cons: + Can be slower due to the overhead of creating a new `Date` object for comparison. + Might not work as expected with non-Date values (e.g., strings). 2. `Object.prototype.toString.call('a')`: * Pros: + More flexible and can handle various types of values, including strings and numbers. + Less chance of type coercion errors. * Cons: + Can be slower due to the overhead of calling a method on `Object.prototype`. + Might not work as expected with non-String values (e.g., arrays or objects). **Other considerations:** * Both approaches assume that the input value is a string representation of a date. If the input can be a `Date` object itself, the results might differ. * The `instanceof` operator uses a cached lookup table for performance, which might affect its behavior in certain cases. **Library usage: None** There are no libraries used in these benchmark tests. **Special JavaScript feature or syntax: None** There are no special features or syntax used in this benchmark. It's a straightforward comparison of two approaches. **Other alternatives:** If you need to compare dates, other alternatives might include: * Using the `Date.parse()` method to convert strings to timestamps * Using the `Date.now()` method to get the current timestamp * Using a date parsing library like Moment.js or Luxon In terms of comparing values using the `instanceof` operator and `toString()` method, other approaches might include: * Using the `TypeOf` operator (not available in all browsers) * Using a custom implementation for type checking However, these alternatives are not directly related to the specific benchmark test being discussed.
Related benchmarks:
Date.parse and toString() vs new Date
new Date().toISOString() vs new Date().toLocaleString()
Date: Object.prototype.toString vs instanceof
Instanceof VS toString for date comparison when using objects
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