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Objekt je prázdný?
(version: 0)
Benchmark.js
Comparing performance of:
=== vs == vs Boolean
Created:
2 years ago
by:
Guest
Go to the latest result
Script Preparation code:
xxx = {}
Tests:
===
Object.keys(xxx) === 0
==
Object.keys(xxx) == 0
Boolean
Boolean(Object.keys(xxx)[0])
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
===
==
Boolean
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
Browser/OS:
Chrome 120 on Android
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=496248" width="100%" height="500px"></iframe>
===
2.9M/s
Boolean
2.0M/s
==
1.8M/s
View exact numbers
Test name
Executions per second
✓
===
2,932,661 Ops/sec
Boolean
2,029,206 Ops/sec
==
1,835,539 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided benchmark definitions and explain what's being tested, compared, and the pros and cons of different approaches. **Benchmark Definition JSON** The provided JSON represents a benchmark definition, which is a template for creating JavaScript microbenchmarks on the MeasureThat.net website. It contains the following information: * `Name`: The name of the benchmark. * `Description`: An optional description of the benchmark (not used in this case). * `Script Preparation Code`: A code snippet that prepares the test environment, specifically setting up an empty object `xxx`. * `Html Preparation Code`: Another optional code snippet for preparing HTML elements, which is not used in this case. **Individual Test Cases** There are three individual test cases: 1. **"Object.keys(xxx) === 0"`** * The benchmark definition checks whether the length of an empty object's keys is equal to zero. * This test compares: + `===` (strict equality operator) + `==` (loose equality operator) * Pros and Cons: + Using `===` ensures that the comparison only considers primitive values, which can lead to false positives if the object's keys are non-primitive objects. + Using `==` is more permissive but may result in slower performance due to potential type coercion. 2. **"Object.keys(xxx) == 0"`** * This test is identical to the previous one, but uses the loose equality operator `==`. * The pros and cons are similar to the first test case. 3. **"Boolean(Object.keys(xxx)[0])"`** * This test checks whether the boolean value of the first key of an empty object's keys array is true. * This test compares: + The `Boolean` function, which converts a value to its boolean equivalent. * Pros and Cons: + Using `Boolean()` explicitly ensures that the comparison only considers boolean values. + Without using `Boolean()`, the comparison may result in false positives if the object's keys are non-boolean objects. **Library: Object.keys()** The `Object.keys()` method is used to get an array of a given object's own enumerable property names. In this case, it's used to check whether an empty object has any keys. The `Object.keys()` method returns an array containing the property names as strings. **Special JS Feature/Syntax: None** There are no special JavaScript features or syntax used in these test cases. **Other Alternatives** If you wanted to implement similar benchmarks, here are some alternative approaches: * Instead of using `===` and `==`, you could use `Object.keys(xxx).length === 0` for strict equality. * For the loose equality operator comparison, you could use a library like Lodash's `isEqual()` function or write your own implementation using JavaScript's built-in functions. * If you want to test the boolean value of an object's keys array, you could use `Object.keys(xxx).length ? true : false`, but this is equivalent to using `Boolean(Object.keys(xxx)[0])`. Keep in mind that these alternatives may not provide exactly the same results as the original benchmark cases, and some might be slower or more prone to errors.
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