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Fastest way to check if object is empty2
(version: 0)
You don't need to make add for loops in your test scenarios, the benchmark does it itself.
Comparing performance of:
object.keys() vs JSON.stringify() vs for in
Created:
3 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var xxx = {} var yyy = {}; for (let i = 0; i < 10; ++i) { yyy[`key${i}`] = i; } function isEmpty(v) { for (const _ in xxx) { return false } return true; }
Tests:
object.keys()
Object.keys(xxx) === 0 Object.keys(yyy) === 0
JSON.stringify()
JSON.stringify(xxx) === "{}" JSON.stringify(yyy) === "{}"
for in
isEmpty(xxx); isEmpty(yyy);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
Fork
Test case name
Result
object.keys()
JSON.stringify()
for in
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Edg/120.0.0.0
Browser/OS:
Chrome 120 on Windows
View result in a separate tab
Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=493845" width="100%" height="500px"></iframe>
object.keys()
3.8M/s
for in
3.7M/s
JSON.stringify()
1.3M/s
View exact numbers
Test name
Executions per second
✓
object.keys()
3,794,875 Ops/sec
for in
3,688,980 Ops/sec
JSON.stringify()
1,298,411 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**What is being tested?** The provided JSON represents a JavaScript microbenchmark test case on the MeasureThat.net website. The benchmark tests different approaches to check if an object is empty. In this specific case, there are three test cases: 1. **object.keys()**: This test case measures how fast the `Object.keys()` method can return an array of keys for two empty objects (`xxx` and `yyy`). 2. **JSON.stringify()**: This test case measures how fast the `JSON.stringify()` method can convert two empty objects (`xxx` and `yyy`) to their JSON representations. 3. **for...in**: This test case measures how fast the `for...in` loop can check if an object is empty by iterating over its keys. **Options compared** The three options being tested are: * Using the `Object.keys()` method to check if an object is empty * Using the `JSON.stringify()` method to convert an object to its JSON representation and then checking if the resulting string is equal to `{}` (the JSON representation of an empty object) * Using a custom `for...in` loop to iterate over the keys of an object and check if it's empty **Pros and cons of each approach** 1. **object.keys()**: * Pros: Simple, efficient, and widely supported. * Cons: May not be as fast for very large objects due to its iterative nature. 2. **JSON.stringify()**: * Pros: Can handle complex objects with nested structures. However, it may involve additional overhead for objects with many keys or values. * Cons: May introduce unnecessary complexity and slower performance compared to `object.keys()` for simple cases. 3. **for...in**: * Pros: Allows for more control over the iteration process and can be adapted to specific use cases. * Cons: Can be slower due to its iterative nature and may not be as efficient as using built-in methods like `Object.keys()`. **Library usage** None of the test cases explicitly uses any external libraries. However, it's worth noting that some browsers or environments might provide additional functionality or optimizations for certain methods (e.g., `JSON.stringify()`). **Special JS features or syntax** The test case uses the `for...in` loop, which is a legacy feature from older JavaScript versions. While it's still supported in modern browsers and engines, its use is generally discouraged in favor of more modern iteration techniques like `for...of` or `Object.keys()`.
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