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Objekt je prázdný? 2
(version: 0)
Benchmark.js
Comparing performance of:
=== vs == vs Boolean vs !==
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])
!==
Object.keys(xxx) !== 0
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
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
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=496250" width="100%" height="500px"></iframe>
===
2.8M/s
!==
2.8M/s
Boolean
1.9M/s
==
1.8M/s
View exact numbers
Test name
Executions per second
✓
===
2,839,385 Ops/sec
!==
2,813,980 Ops/sec
Boolean
1,941,478 Ops/sec
==
1,784,105 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON data and explain what's being tested. **Benchmark Definition** The benchmark definition is a simple JavaScript statement that checks if an object is empty (`Object.keys(xxx) === 0`). The variable `xxx` is initialized with an empty object using the line `"xxx = {}"` in the script preparation code. This creates an object without any properties, making it effectively empty. **Options Compared** The benchmark compares four different approaches to check if the object is empty: 1. **Strict Equality (`===`)**: `Object.keys(xxx) === 0` 2. **Loose Equality (`==`)`: `Object.keys(xxx) == 0` 3. **Boolean Casting**: `Boolean(Object.keys(xxx)[0])` 4. **Non-Strict Equality (`!==`)`: `Object.keys(xxx) !== 0` **Pros and Cons of Each Approach** 1. **Strict Equality (`===`)**: * Pros: Most accurate, as it checks for both value and type equality. * Cons: Can be slower due to the additional check for type equality. 2. **Loose Equality (`==`)**: * Pros: Faster, as it only checks for value equality. * Cons: Inaccurate if the object has a `toString()` method that returns a non-empty string representation of an empty object (e.g., `{}`). 3. **Boolean Casting**: `Boolean(Object.keys(xxx)[0])` * Pros: Fast and accurate, as it simply converts the result to a boolean value. * Cons: May not work as expected if `Object.keys()` returns an array with only one element (which would be converted to `true`), but you still want to check for an empty object. 4. **Non-Strict Equality (`!==`)**: * Pros: Faster, as it only checks for value inequality. * Cons: Inaccurate if the object is actually empty, as it will return `false`. **Library and Special JS Features** None of the options use a specific library or special JavaScript features. **Other Considerations** The benchmark uses an empty object (`xxx`) as the test subject. This simplifies the comparison but may not accurately represent real-world scenarios where objects are often more complex. **Alternatives** If you're interested in exploring alternative approaches, consider using: * `Object.isEmpty()` (ES6+): A built-in method that checks if an object is empty. * Custom implementations using `Object.keys()` and conditional statements. * Alternative data structures, such as `Map` or `Set`, which may offer better performance characteristics for certain use cases. Keep in mind that the choice of approach depends on your specific requirements, performance constraints, and JavaScript version support.
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